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Apollo 11 was the
spaceflight Spaceflight (or space flight) is an application of astronautics to fly spacecraft into or through outer space, either human spaceflight, with or uncrewed spaceflight, without humans on board. Most spaceflight is uncrewed and conducted mainly wit ...

spaceflight
that first landed humans on the
Moon The Moon is Earth's only natural satellite. At about one-quarter the diameter of Earth (comparable to the width of Australia (continent), Australia), it is the largest natural satellite in the Solar System relative to the size of its plane ...

Moon
. Commander
Neil Armstrong Neil Alden Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipp ...

Neil Armstrong
and lunar module pilot
Buzz Aldrin Buzz Aldrin (; born Edwin Eugene Aldrin Jr., January 20, 1930) is an American former astronaut, engineer and fighter pilot. Aldrin made three extravehicular activity, spacewalks as pilot of the 1966 Gemini 12 mission, and as the lunar module ...

Buzz Aldrin
formed the American crew that landed the
Apollo Lunar Module The Apollo Lunar Module, or simply Lunar Module (LM ), originally designated the Lunar Excursion Module (LEM), was the lander spacecraft that was flown between lunar orbit and the Moon's surface during the U.S. Apollo program The Apollo ...
''Eagle'' on July 20, 1969, at 20:17 UTC (14:17
CST CST or Cst may refer to: Time zones * Central Standard Time, North America's Central Time Zone: UTC−06:00 * China Standard Time: UTC+08:00 * Cuba Standard Time: UTC−04:00 Government and politics * Canada Social Transfer, an equalization pay ...
). Armstrong became the first person to step onto the lunar surface six hours and 39 minutes later on July 21 at 02:56 UTC; Aldrin joined him 19 minutes later. They spent about two and a quarter hours together outside the spacecraft, and they collected of lunar material to bring back to
Earth Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. 29.2% of Earth's surface is land consisting of continents and islands. The remaining 70.8% is Water distribution on Earth, covered wi ...

Earth
. Command module pilot Michael Collins flew the Command Module ''Columbia'' alone in
lunar orbit In astronomy Astronomy (from el, ἀστρονομία, literally meaning the science that studies the laws of the stars) is a natural science that studies astronomical object, celestial objects and celestial event, phenomena. It uses m ...

lunar orbit
while they were on the Moon's surface. Armstrong and Aldrin spent 21 hours, 36 minutes on the lunar surface at a site they named
Tranquility Base Tranquility Base ( la, Statio Tranquillitatis) is the site on the Moon where, in July 1969, humans landed and walked on a celestial body other than Earth for the first time. On July 20, 1969, Apollo 11 crewmembers Neil Armstrong and Buzz Aldrin la ...
before lifting off to rejoin ''Columbia'' in lunar orbit. Apollo 11 was launched by a
Saturn V Saturn V was an American human-rated super heavy-lift launch vehicle used by NASA between 1967 and 1973. A multistage rocket, three-stage, liquid-propellant rocket, liquid-fueled rocket, the Saturn V was developed under the Apollo program for ...

Saturn V
rocket from
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island Merritt Island is a census-designated place A census-designated place (CDP) is a Place (United States Census Bureau ...

Kennedy Space Center
on
Merritt Island, Florida Merritt Island is a census-designated place (CDP) in Brevard County, Florida, Brevard County, Florida, United States, located on the eastern Floridian coast, along the Atlantic Ocean. The population was 34,743 at the 2010 United States Census, 2 ...
, on July 16 at 13:32 UTC, and it was the fifth crewed mission of
NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent agency of the Federal government of the United States, U.S. federal government responsible for the civilian Li ...

NASA
's
Apollo program The Apollo program, also known as Project Apollo, was the third United States human spaceflight program carried out by the NASA, National Aeronautics and Space Administration (NASA), which succeeded in Moon landing, landing the first humans ...

Apollo program
. The Apollo
spacecraft A spacecraft is a vehicle or machine designed to fly in outer space. A type of artificial satellite alt=, A full-size model of the Earth observation satellite ERS 2 ">ERS_2.html" ;"title="Earth observation satellite ERS 2">Earth obse ...
had three parts: a command module (CM) with a cabin for the three astronauts, the only part that returned to Earth; a service module (SM), which supported the command module with propulsion, electrical power, oxygen, and water; and a lunar module (LM) that had two stages—a descent stage for landing on the Moon and an ascent stage to place the astronauts back into lunar orbit. After being
sent to the Moon
sent to the Moon
by the Saturn V's third stage, the astronauts separated the spacecraft from it and traveled for three days until they entered lunar orbit. Armstrong and Aldrin then moved into ''Eagle'' and landed in the
Sea of Tranquility Mare Tranquillitatis (Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken in the area around Rome, known as Latium. Through the power of t ...
on July 20. The astronauts used ''Eagle''s ascent stage to lift off from the lunar surface and rejoin Collins in the command module. They jettisoned ''Eagle'' before they performed the maneuvers that propelled ''Columbia'' out of the last of its 30 lunar orbits onto a trajectory back to Earth. They returned to Earth and
splashed down
splashed down
in the Pacific Ocean on July 24 after more than eight days in space. Armstrong's first step onto the lunar surface was broadcast on live TV to a worldwide audience. He described the event as "one small step for man, one giant leap for mankind". Apollo 11 effectively ended the
Space Race The Space Race was a 20th-century competition between two Cold War The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, whi ...
and fulfilled a national goal proposed in 1961 by
President President most commonly refers to: *President (corporate title) A president is a leader of an organization, company, community, club, trade union, university or other group. The relationship between a president and a Chief Executive Officer, chi ...

President
John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK, was an American politician who served as the 35th president of the United States The president of the United States (POTUS) is the ...

John F. Kennedy
: "before this decade is out, of landing a man on the Moon and returning him safely to the Earth."


Background

In the late 1950s and early 1960s, the United States was engaged in the
Cold War The Cold War was a period of geopolitical Geopolitics (from Greek#REDIRECT Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, is a country loc ...
, a geopolitical rivalry with the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a that spanned during its existence from 1922 to 1991. It was nominally a of multiple national ; in practice and were highly until its final years. The ...
. On October 4, 1957, the Soviet Union launched
Sputnik 1 Sputnik 1 (; see #Etymology, § Etymology) was the first Satellite, artificial Earth satellite. It was launched into an elliptical low Earth orbit by the Soviet Union, USSR on 4 October 1957 as part of the Soviet space program. It orbited for ...

Sputnik 1
, the first
artificial satellite alt=, A full-size model of the Earth observation satellite ERS 2 ">ERS_2.html" ;"title="Earth observation satellite ERS 2">Earth observation satellite ERS 2 In the context of spaceflight, a satellite is an object that has been intentionally ...

artificial satellite
. This surprise success fired fears and imaginations around the world. It demonstrated that the Soviet Union had the capability to deliver nuclear weapons over intercontinental distances, and challenged American claims of military, economic and technological superiority. This precipitated the
Sputnik crisis The Sputnik crisis was a period of public fear and anxiety in Western nations about the perceived technological gap between the United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US ...
, and triggered the
Space Race The Space Race was a 20th-century competition between two Cold War The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, whi ...
.
President President most commonly refers to: *President (corporate title) A president is a leader of an organization, company, community, club, trade union, university or other group. The relationship between a president and a Chief Executive Officer, chi ...

President
Dwight D. Eisenhower Dwight David "Ike" Eisenhower (; October 14, 1890 – March 28, 1969) was an American military officer An officer is a member of an armed forces or uniformed service who holds a position of authority. In its broadest sense, the term " ...
responded to the Sputnik challenge by creating the
National Aeronautics and Space Administration The National Aeronautics and Space Administration (NASA; ) is an independent agency A regulatory agency or regulatory authority, is a Public benefit corporation Public-benefit corporation is a term that has different meanings in different ...
(NASA), and initiating
Project Mercury Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. An early highlight of the Space Race, its goal was to put a man into Earth orbit In physics, an orbit is the gravitationally ...
, which aimed to launch a man into
Earth orbit A geocentric orbit or Earth orbit involves any object orbiting the Earth, such as the Moon or satellite, artificial satellites. In 1997 NASA estimated there were approximately 2,465 artificial satellite payloads orbiting the Earth and 6,216 pieces ...
. But on April 12, 1961, Soviet
cosmonaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a sp ...
Yuri Gagarin Yuri Alekseyevich Gagarin; Gagarin's first name is sometimes transliterated as ''Yuriy'', ''Youri'', or ''Yury''. (9 March 1934 – 27 March 1968) was a Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (U ...
became the first person in space, and the first to orbit the Earth. Nearly a month later, on May 5, 1961,
Alan Shepard Alan Bartlett Shepard Jr. (November 18, 1923 – July 21, 1998) was an American astronaut, United States naval aviator, naval aviator, test pilot, and businessman. In 1961, he became the second man and the first American to travel into space, a ...

Alan Shepard
became the first American in space, completing a 15-minute suborbital journey. After being recovered from the Atlantic Ocean, he received a congratulatory telephone call from Eisenhower's successor,
John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK, was an American politician who served as the 35th president of the United States The president of the United States (POTUS) is the ...

John F. Kennedy
. Since the Soviet Union had higher lift capacity
launch vehicle A launch vehicle or carrier rocket is a rocket engine, rocket-propelled vehicle used to carry a payload from Earth's surface to spaceflight, space, usually to Earth orbit or escape velocity, beyond. A launch system includes the launch vehic ...
s, Kennedy chose, from among options presented by NASA, a challenge beyond the capacity of the existing generation of rocketry, so that the US and Soviet Union would be starting from a position of equality. A crewed mission to the Moon would serve this purpose. On May 25, 1961, Kennedy addressed the
United States Congress The United States Congress is the legislature of the federal government of the United States. It is Bicameralism, bicameral, comprising a lower body, the United States House of Representatives, House of Representatives, and an upper body, t ...

United States Congress
on "Urgent National Needs" and declared: On September 12, 1962, Kennedy delivered another speech before a crowd of about 40,000 people in the Rice University football stadium in
Houston Houston ( ) is the List of cities in Texas by population, most populous city in Texas, List of United States cities by population, fourth-most populous city in the United States, most populous city in the Southern United States, as well as th ...

Houston
,
Texas Texas (, ; Spanish Spanish may refer to: * Items from or related to Spain: **Spaniards, a nation and ethnic group indigenous to Spain **Spanish language **Spanish cuisine Other places * Spanish, Ontario, Canada * Spanish River (disambigu ...

Texas
. A widely quoted refrain from the middle portion of the speech reads as follows: In spite of that, the proposed program faced the opposition of many Americans and was dubbed a " moondoggle" by
Norbert Wiener Norbert Wiener (November 26, 1894 – March 18, 1964) was an American mathematician A mathematician is someone who uses an extensive knowledge of mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as ...

Norbert Wiener
, a mathematician at the
Massachusetts Institute of Technology Massachusetts Institute of Technology (MIT) is a private Private or privates may refer to: Music * "In Private "In Private" was the third single in a row to be a charting success for United Kingdom, British singer Dusty Springfield, aft ...
. The effort to land a man on the Moon already had a name:
Project Apollo The Apollo program, also known as Project Apollo, was the third United States human spaceflight program carried out by the NASA, National Aeronautics and Space Administration (NASA), which succeeded in Moon landing, landing the first humans ...
. When Kennedy met with
Nikita Khrushchev Nikita Sergeyevich Khrushchev (– 11 September 1971) served as the General Secretary of the Communist Party of the Soviet Union, First Secretary of the Communist Party of the Soviet Union from 1953 to 1964 and as Premier of the Soviet Unio ...
, the
Premier of the Soviet Union The Premier of the Soviet Union (russian: Глава Правительства СССР) was the head of government of the Union of Soviet Socialist Republics (USSR). The office had four different names throughout its existence: Chairman of the ...
in June 1961, he proposed making the Moon landing a joint project, but Khrushchev did not take up the offer. Kennedy again proposed a joint expedition to the Moon in a speech to the
United Nations General Assembly The United Nations General Assembly (UNGA or GA; french: link=no, Assemblée générale, AG) is one of the six principal organs of the United Nations The United Nations System consists of the United Nations The United Nations (UN) ...
on September 20, 1963. The idea of a joint Moon mission was abandoned after Kennedy's death. An early and crucial decision was choosing over both
direct ascent Direct ascent is a method of landing a spacecraft on the Moon or another planet directly, without first assembling the vehicle in Earth orbit, or carrying a separate landing vehicle into orbit around the target body. It was proposed as the first m ...
and
Earth orbit rendezvous Earth orbit rendezvous (EOR) is a method for conducting round trip human flights to the Moon, involving the use of space rendezvous A space rendezvous () is a set of orbital maneuvers during which two spacecraft 275px, The US Space Shutt ...
. A
space rendezvous A space rendezvous () is a set of orbital maneuver In spaceflight, an orbital maneuver (otherwise known as a burn) is the use of propulsion systems to change the orbit of a spacecraft. For spacecraft far from Earth (for example those in ...
is an
orbital maneuver In spaceflight, an orbital maneuver (otherwise known as a burn) is the use of propulsion systems to change the orbit of a spacecraft. For spacecraft far from Earth (for example those in orbits around the Sun) an orbital maneuver is called a ...
in which two spacecraft navigate through space and meet up. In July 1962 NASA head
James WebbJames, Jim or Jimmy Webb may refer to: Arts *Jim Webb James Henry Webb Jr. (born February 9, 1946) is an American politician and author. He has served as a United States Senator The United States Senate is the Upper house, upper chamber o ...
announced that lunar orbit rendezvous would be used and that the
Apollo spacecraft The Apollo spacecraft was composed of three parts designed to accomplish the American 's goal of landing astronauts on the by the end of the 1960s and returning them safely to . The expendable (single-use) spacecraft consisted of a (CSM) and ...
would have three major parts: a command module (CM) with a cabin for the three astronauts, and the only part that returned to Earth; a service module (SM), which supported the command module with propulsion, electrical power, oxygen, and water; and a lunar module (LM) that had two stages—a descent stage for landing on the Moon, and an ascent stage to place the astronauts back into lunar orbit. This design meant the spacecraft could be launched by a single
Saturn V Saturn V was an American human-rated super heavy-lift launch vehicle used by NASA between 1967 and 1973. A multistage rocket, three-stage, liquid-propellant rocket, liquid-fueled rocket, the Saturn V was developed under the Apollo program for ...

Saturn V
rocket that was then under development. Technologies and techniques required for Apollo were developed by
Project Gemini Project Gemini () was NASA's second human spaceflight program. Conducted between projects Project Mercury, Mercury and Apollo program, Apollo, Gemini started in 1961 and concluded in 1966. The Gemini spacecraft carried a two-astronaut crew. Ten ...
. The Apollo project was enabled by NASA's adoption of new advances in
semiconductor A semiconductor material has an value falling between that of a , such as metallic copper, and an , such as glass. Its falls as its temperature rises; metals behave in the opposite way. Its conducting properties may be altered in useful ways ...
electronic technology Electronics comprises the physics, engineering, technology and applications that deal with the emission, flow and control of electron The electron is a subatomic particle, symbol or , whose electric charge Electric charge is the physica ...
, including
metal-oxide-semiconductor field-effect transistor The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET), also known as the metal–oxide–silicon transistor (MOS transistor, or MOS), is a type of insulated-gate field-effect transistor The field-effect trans ...
s (MOSFETs) in the
Interplanetary Monitoring PlatformInterplanetary Monitoring Platform was a program managed by the NASA Goddard Space Flight Center in Greenbelt, Maryland Greenbelt is a city in Prince George's County, Maryland, United States, and a suburb of Washington, D.C. Greenbelt is notable ...
(IMP) and
silicon Silicon is a chemical element with the Symbol (chemistry), symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a Tetravalence, tetravalent metalloid and semiconductor. It is a member ...

silicon
integrated circuit An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuit 200px, A circuit built on a printed circuit board (PCB). An electronic circuit is composed of indiv ...

integrated circuit
(IC) chips in the
Apollo Guidance Computer The Apollo Guidance Computer (AGC) is a digital computer produced for the Apollo program that was installed on board each Apollo command module (CM) and Apollo Lunar Module (LM). The AGC provided computation and electronic interfaces for guidance, ...

Apollo Guidance Computer
(AGC). Project Apollo was abruptly halted by the
Apollo 1 Apollo 1, initially designated AS-204, was the first crewed mission of the United States , the undertaking to land the first man on the Moon. It was planned to launch on February 21, 1967, as the first al test of the . The mission never flew; ...

Apollo 1
fire on January 27, 1967, in which astronauts
Gus Grissom Virgil Ivan "Gus" Grissom (April 3, 1926 – January 27, 1967) was a United States Air Force The United States Air Force (USAF) is the Atmosphere of Earth, air military branch, service branch of the United States Armed Forces. It is one o ...
, Ed White, and Roger B. Chaffee died, and the subsequent investigation. In October 1968,
Apollo 7 Apollo 7 (October 11–22, 1968) was the first crewed flight in NASA The National Aeronautics and Space Administration (NASA; ) is an independent agency A regulatory agency or regulatory authority, is a Public benefit corporation Pu ...
evaluated the command module in Earth orbit, and in December
Apollo 8 Apollo 8 was the first crewed spacecraft File:Space Shuttle Columbia launching.jpg, 275px, The US Space Shuttle flew 135 times from 1981 to 2011, supporting Spacelab, ''Mir'', the Hubble Space Telescope, and the ISS. (''Columbia'' STS-1, mai ...
tested it in lunar orbit. In March 1969,
Apollo 9 Apollo 9 (March 3–13, 1969) was the third human spaceflight Human spaceflight (also referred to as manned spaceflight or crewed spaceflight) is spaceflight with a crew or passengers aboard a spacecraft, the spacecraft being operated dir ...

Apollo 9
put the lunar module through its paces in Earth orbit, and in May
Apollo 10 Apollo 10 (May 18–26, 1969) was a , the fourth crewed mission in the United States , and the second (after ) to orbit the Moon. It was the : a "dress rehearsal" for the first , testing all the components and procedures just short of actually l ...
conducted a "dress rehearsal" in lunar orbit. By July 1969, all was in readiness for Apollo 11 to take the final step onto the Moon. The Soviet Union competed with the US in the Space Race, but its early lead was lost through repeated failures in development of the N1 launcher, which was comparable to the Saturn V. The Soviets tried to beat the US to return lunar material to the Earth by means of uncrewed probes. On July 13, three days before Apollo 11's launch, the Soviet Union launched
Luna 15 Luna 15 was a robotic space mission 250px, An artist's interpretation of the '' MESSENGER'' spacecraft at Mercury A robotic spacecraft is an uncrewed spacecraft, usually under telerobotic control. A robotic spacecraft designed to make scientif ...
, which reached lunar orbit before Apollo 11. During descent, a malfunction caused Luna 15 to crash in
Mare Crisium Mare Crisium (Latin ''crisium'', the "Sea of Crises") is a lunar mare The lunar maria (singular: mare ) are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed ''maria'', Latin Latin (, or , ...

Mare Crisium
about two hours before Armstrong and Aldrin took off from the Moon's surface to begin their voyage home. The
Nuffield Radio Astronomy Laboratories The Jodrell Bank Observatory () – originally the Jodrell Bank Experimental Station and from 1966 to 1999, the Nuffield Radio Astronomy Laboratories – hosts a number of radio telescope A radio telescope is a specialized antenna and radio ...
radio telescope in England recorded transmissions from Luna 15 during its descent, and these were released in July 2009 for the 40th anniversary of Apollo 11.


Personnel


Prime crew

The initial crew assignment of Commander
Neil Armstrong Neil Alden Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipp ...

Neil Armstrong
, Command Module Pilot (CMP)
Jim Lovell James Arthur Lovell Jr. (; born March 25, 1928) is an American retired astronaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipped, and ...

Jim Lovell
, and Lunar Module Pilot (LMP)
Buzz Aldrin Buzz Aldrin (; born Edwin Eugene Aldrin Jr., January 20, 1930) is an American former astronaut, engineer and fighter pilot. Aldrin made three extravehicular activity, spacewalks as pilot of the 1966 Gemini 12 mission, and as the lunar module ...

Buzz Aldrin
on the backup crew for Apollo9 was officially announced on November 20, 1967. Lovell and Aldrin had previously flown together as the crew of
Gemini 12 Gemini 12 (officially Gemini XII) With Gemini IV, NASA changed to Roman numerals for Gemini mission designations. was a 1966 crewed spaceflight Human spaceflight (also referred to as manned spaceflight or crewed spaceflight) is spaceflight ...
. Due to design and manufacturing delays in the LM, Apollo8 and Apollo9 swapped prime and backup crews, and Armstrong's crew became the backup for Apollo8. Based on the normal crew rotation scheme, Armstrong was then expected to command Apollo 11. There would be one change. Michael Collins, the CMP on the Apollo8 crew, began experiencing trouble with his legs. Doctors diagnosed the problem as a bony growth between his fifth and sixth vertebrae, requiring surgery. Lovell took his place on the Apollo8 crew, and when Collins recovered he joined Armstrong's crew as CMP. In the meantime,
Fred Haise Fred Wallace Haise Jr. ( ; born November 14, 1933) is an American former NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent agency of the Federal govern ...

Fred Haise
filled in as backup LMP, and Aldrin as backup CMP for Apollo 8. Apollo 11 was the second American mission where all the crew members had prior spaceflight experience, the first being Apollo 10. The next was
STS-26 STS-26 was the 26th NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent agency of the Federal government of the United States, U.S. federal government res ...
in 1988.
Deke Slayton Donald Kent "Deke" Slayton (March 1, 1924 – June 13, 1993) was a United States Air Force The United States Air Force (USAF) is the air File:Atmosphere gas proportions.svg, Composition of Earth's atmosphere by volume, excluding wa ...
gave Armstrong the option to replace Aldrin with Lovell, since some thought Aldrin was difficult to work with. Armstrong had no issues working with Aldrin but thought it over for a day before declining. He thought Lovell deserved to command his own mission (eventually
Apollo 13 Apollo 13 was the seventh crewed mission in the Apollo program, Apollo space program and the third meant to Moon landing, land on the Moon. The craft was launched from Kennedy Space Center on April 11, 1970, but the lunar landing was aborted ...
). The Apollo 11 prime crew had none of the close cheerful camaraderie characterized by that of
Apollo 12 Apollo 12 (November 14–24, 1969) was the sixth crewed flight in the United States Apollo program and the second to land on the Moon. It was launched on November 14, 1969, from the Kennedy Space Center, Florida. Commander Pete Conrad, Charles ...
. Instead they forged an amiable working relationship. Armstrong in particular was notoriously aloof, but Collins, who considered himself a loner, confessed to rebuffing Aldrin's attempts to create a more personal relationship. Aldrin and Collins described the crew as "amiable strangers". Armstrong did not agree with the assessment, and said "... all the crews I was on worked very well together."


Backup crew

The backup crew consisted of Lovell as Commander,
William Anders William Alison Anders (born October 17, 1933) is a retired United States Air Force The United States Air Force (USAF) is the Atmosphere of Earth, air military branch, service branch of the United States Armed Forces. It is one of the eight u ...

William Anders
as CMP, and Haise as LMP. Anders had flown with Lovell on Apollo8. In early 1969, he accepted a job with the
National Aeronautics and Space Council The National Space Council is a body within the Executive Office of the President of the United States created in 1989 during the George H.W. Bush administration, disbanded in 1993, and reestablished in June 2017 by the Donald Trump administration. ...
effective August 1969, and announced he would retire as an astronaut at that time.
Ken Mattingly Thomas K. Mattingly II (born March 17, 1936) is an American former aviator An aircraft pilot or aviator is a person who controls the flight of an aircraft An aircraft is a vehicle that is able to flight, fly by gaining support fro ...

Ken Mattingly
was moved from the support crew into parallel training with Anders as backup CMP in case Apollo 11 was delayed past its intended July launch date, at which point Anders would be unavailable. By the normal crew rotation in place during Apollo, Lovell, Mattingly, and Haise were scheduled to fly on
Apollo 14 Apollo 14 (January 31, 1971February 9, 1971) was the eighth crewed mission in the United States , the third to , and the first to land in the . It was the last of the "", landings at specific sites of scientific interest on the Moon for two-day ...
after backing up for Apollo 11. Later, Lovell's crew was forced to switch places with
Alan Shepard Alan Bartlett Shepard Jr. (November 18, 1923 – July 21, 1998) was an American astronaut, United States naval aviator, naval aviator, test pilot, and businessman. In 1961, he became the second man and the first American to travel into space, a ...

Alan Shepard
's tentative
Apollo 13 Apollo 13 was the seventh crewed mission in the Apollo program, Apollo space program and the third meant to Moon landing, land on the Moon. The craft was launched from Kennedy Space Center on April 11, 1970, but the lunar landing was aborted ...
crew to give Shepard more training time.


Support crew

During Projects Mercury and Gemini, each mission had a prime and a backup crew. For Apollo, a third crew of astronauts was added, known as the support crew. The support crew maintained the flight plan, checklists and mission ground rules, and ensured the prime and backup crews were apprised of changes. They developed procedures, especially those for emergency situations, so these were ready for when the prime and backup crews came to train in the simulators, allowing them to concentrate on practicing and mastering them. For Apollo 11, the support crew consisted of Ken Mattingly, Ronald Evans and .


Capsule communicators

The
capsule communicator Flight controllers are personnel who aid space flight by working in such Mission Control Centers as NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent a ...
(CAPCOM) was an astronaut at the
Mission Control Center A mission control center (MCC, sometimes called a flight control center or operations center) is a facility that manages spaceflight, space flights, usually from the point of launch until landing or the end of the mission. It is part of the gr ...
in
Houston, Texas Houston ( ) is the most populous city The United Nations uses three definitions for what constitutes a city, as not all cities in all jurisdictions are classified using the same criteria. Cities may be defined as the city proper, cities pr ...
, who was the only person who communicated directly with the flight crew. For Apollo 11, the CAPCOMs were:
Charles Duke Charles Moss Duke Jr. (born October 3, 1935) is an American former astronaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipped, and deploye ...

Charles Duke
, Ronald Evans,
Bruce McCandless II The English language English is a West Germanic language of the Indo-European language family, originally spoken by the inhabitants of early medieval England. It is named after the Angles, one of the ancient Germanic peoples that migrated ...

Bruce McCandless II
, James Lovell, William Anders, Ken Mattingly, Fred Haise, Don L. Lind, and
Harrison Schmitt Harrison Hagan "Jack" Schmitt (born July 3, 1935) is an American geologist A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape ...

Harrison Schmitt
.


Flight directors

The for this mission were:


Other key personnel

Other key personnel who played important roles in the Apollo 11 mission include the following.


Preparations


Insignia

The Apollo 11 mission emblem was designed by Collins, who wanted a symbol for "peaceful lunar landing by the United States". At Lovell's suggestion, he chose the
bald eagle The bald eagle (''Haliaeetus leucocephalus'') is a bird of prey Birds of prey, also known as raptors, include species of bird Birds are a group of s constituting the Aves , characterised by s, toothless beaked jaws, the of e ...

bald eagle
, the
national bird This is a list of national birds. Most species in the list are officially designated. Some species hold only an "unofficial" status. National birds See also * List of Australian bird emblems * List of Indian state birds * List of U.S. state ...

national bird
of the United States, as the symbol. Tom Wilson, a simulator instructor, suggested an
olive branch The olive branch is a peace symbols, symbol of peace and victory associated with customs of ancient Greece and connected with supplication to gods and persons in power. It is found in most cultures of the Mediterranean basin and became associated ...

olive branch
in its beak to represent their peaceful mission. Collins added a lunar background with the Earth in the distance. The sunlight in the image was coming from the wrong direction; the shadow should have been in the lower part of the Earth instead of the left. Aldrin, Armstrong and Collins decided the Eagle and the Moon would be in their natural colors, and decided on a blue and gold border. Armstrong was concerned that "eleven" would not be understood by non-English speakers, so they went with "Apollo 11", and they decided not to put their names on the patch, so it would "be representative of ''everyone'' who had worked toward a lunar landing". An illustrator at the
Manned Spacecraft Center The Lyndon B. Johnson Space Center (JSC) is NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent agency of the Federal government of the United States, U. ...
(MSC) did the artwork, which was then sent off to NASA officials for approval. The design was rejected. Bob Gilruth, the director of the MSC felt the talons of the eagle looked "too warlike". After some discussion, the olive branch was moved to the talons. When the Eisenhower dollar, Eisenhower dollar coin was released in 1971, the patch design provided the eagle for its reverse side. The design was also used for the smaller Susan B. Anthony dollar unveiled in 1979.


Call signs

After the crew of Apollo 10 named their spacecraft ''Charlie Brown'' and ''Snoopy'', assistant manager for public affairs Julian Scheer wrote to George M. Low, the Manager of the Apollo Spacecraft Program Office at the MSC, to suggest the Apollo 11 crew be less flippant in naming their craft. The name ''Snowcone'' was used for the CM and ''Haystack'' was used for the LM in both internal and external communications during early mission planning. The LM was named ''Lunar Module Eagle, Eagle'' after the motif which was featured prominently on the mission insignia. At Scheer's suggestion, the CM was named ''Command module Columbia, Columbia'' after ''Columbiad#In fiction, Columbiad'', the giant cannon that launched a spacecraft (also from Florida) in Jules Verne's 1865 novel ''From the Earth to the Moon''. It also referred to Columbia (name), Columbia, a historical name of the United States. In Collins' 1976 book, he said ''Columbia'' was in reference to Christopher Columbus.


Mementos

The astronauts had personal preference kits (PPKs), small bags containing personal items of significance they wanted to take with them on the mission. Five PPKs were carried on Apollo 11: three (one for each astronaut) were stowed on ''Columbia'' before launch, and two on ''Eagle''. Neil Armstrong's LM PPK contained a piece of wood from the Wright brothers' 1903 ''Wright Flyer''s left propeller and a piece of fabric from its wing, along with a diamond-studded astronaut pin originally given to Slayton by the widows of the Apollo1 crew. This pin had been intended to be flown on that mission and given to Slayton afterwards, but following the disastrous launch pad fire and subsequent funerals, the widows gave the pin to Slayton. Armstrong took it with him on Apollo 11.


Site selection

NASA's Apollo Site Selection Board announced five potential landing sites on February 8, 1968. These were the result of two years' worth of studies based on high-resolution photography of the lunar surface by the five uncrewed probes of the Lunar Orbiter program and information about surface conditions provided by the Surveyor program. The best Earth-bound telescopes could not resolve features with the resolution Project Apollo required. The landing site had to be close to the lunar equator to minimize the amount of propellant required, clear of obstacles to minimize maneuvering, and flat to simplify the task of the landing radar. Scientific value was not a consideration. Areas that appeared promising on photographs taken on Earth were often found to be totally unacceptable. The original requirement that the site be free of craters had to be relaxed, as no such site was found. Five sites were considered: Sites1 and2 were in the Sea of Tranquility (''Mare Tranquillitatis''); Site3 was in the Central Bay (''Sinus Medii''); and Sites4 and5 were in the Ocean of Storms (''Oceanus Procellarum''). The final site selection was based on seven criteria: * The site needed to be smooth, with relatively few craters; * with approach paths free of large hills, tall cliffs or deep craters that might confuse the landing radar and cause it to issue incorrect readings; * reachable with a minimum amount of propellant; * allowing for delays in the launch countdown; * providing the Apollo spacecraft with a free-return trajectory, one that would allow it to coast around the Moon and safely return to Earth without requiring any engine firings should a problem arise on the way to the Moon; * with good visibility during the landing approach, meaning the Sun would be between 7and 20 degrees behind the LM; and * a general slope of less than two degrees in the landing area. The requirement for the Sun angle was particularly restrictive, limiting the launch date to one day per month. A landing just after dawn was chosen to limit the temperature extremes the astronauts would experience. The Apollo Site Selection Board selected Site2, with Sites 3and5 as backups in the event of the launch being delayed. In May 1969, Apollo 10's lunar module flew to within of Site2, and reported it was acceptable.


First-step decision

During the first press conference after the Apollo 11 crew was announced, the first question was, "Which one of you gentlemen will be the first man to step onto the lunar surface?" Slayton told the reporter it had not been decided, and Armstrong added that it was "not based on individual desire". One of the first versions of the egress checklist had the lunar module pilot exit the spacecraft before the commander, which matched what had been done on Gemini missions, where the commander had never performed the spacewalk. Reporters wrote in early 1969 that Aldrin would be the first man to walk on the Moon, and Associate Administrator George Mueller (NASA), George Mueller told reporters he would be first as well. Aldrin heard that Armstrong would be the first because Armstrong was a civilian, which made Aldrin livid. Aldrin attempted to persuade other lunar module pilots he should be first, but they responded cynically about what they perceived as a lobbying campaign. Attempting to stem interdepartmental conflict, Slayton told Aldrin that Armstrong would be first since he was the commander. The decision was announced in a press conference on April 14, 1969. For decades, Aldrin believed the final decision was largely driven by the lunar module's hatch location. Because the astronauts had their spacesuits on and the spacecraft was so small, maneuvering to exit the spacecraft was difficult. The crew tried a simulation in which Aldrin left the spacecraft first, but he damaged the simulator while attempting to egress. While this was enough for mission planners to make their decision, Aldrin and Armstrong were left in the dark on the decision until late spring. Slayton told Armstrong the plan was to have him leave the spacecraft first, if he agreed. Armstrong said, "Yes, that's the way to do it." The media accused Armstrong of exercising his commander's prerogative to exit the spacecraft first. Chris Kraft revealed in his 2001 autobiography that a meeting occurred between Gilruth, Slayton, Low, and himself to make sure Aldrin would not be the first to walk on the Moon. They argued that the first person to walk on the Moon should be like Charles Lindbergh, a calm and quiet person. They made the decision to change the flight plan so the commander was the first to egress from the spacecraft.


Pre-launch

The ascent stage of Lunar Module Eagle, LM-5 ''Eagle'' arrived at the
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island Merritt Island is a census-designated place A census-designated place (CDP) is a Place (United States Census Bureau ...

Kennedy Space Center
on January 8, 1969, followed by the descent stage four days later, and Command module Columbia, CSM-107 ''Columbia'' on January 23. There were several differences between ''Eagle'' and Apollo 10's LM-4 ''Snoopy''; ''Eagle'' had a VHF radio antenna to facilitate communication with the astronauts during their EVA on the lunar surface; a lighter ascent engine; more thermal protection on the landing gear; and a package of scientific experiments known as the Early Apollo Scientific Experiments Package (EASEP). The only change in the configuration of the command module was the removal of some insulation from the forward hatch. The CSM was mated on January 29, and moved from the Operations and Checkout Building to the Vehicle Assembly Building on April 14. The S-IVB third stage of Saturn V AS-506 had arrived on January 18, followed by the S-II second stage on February 6, S-IC first stage on February 20, and the Saturn V Instrument Unit on February 27. At 12:30 on May 20, the assembly departed the Vehicle Assembly Building atop the crawler-transporter, bound for Launch Pad 39A, part of Launch Complex 39, while Apollo 10 was still on its way to the Moon. A countdown test commenced on June 26, and concluded on July 2. The launch complex was floodlit on the night of July 15, when the crawler-transporter carried the service structure, mobile service structure back to its parking area. In the early hours of the morning, the fuel tanks of the S-II and S-IVB stages were filled with liquid hydrogen. Fueling was completed by three hours before launch. Launch operations were partly automated, with 43 programs written in the ATOLL (programming language), ATOLL programming language. Slayton roused the crew shortly after 04:00, and they showered, shaved, and had the traditional pre-flight breakfast of steak and eggs with Slayton and the backup crew. They then donned their space suits and began breathing pure oxygen. At 06:30, they headed out to Launch Complex 39. Haise entered ''Columbia'' about three hours and ten minutes before launch time. Along with a technician, he helped Armstrong into the left hand couch at 06:54. Five minutes later, Collins joined him, taking up his position on the right hand couch. Finally, Aldrin entered, taking the center couch. Haise left around two hours and ten minutes before launch. The closeout crew sealed the hatch, and the cabin was purged and pressurized. The closeout crew then left the launch complex about an hour before launch time. The countdown became automated at three minutes and twenty seconds before launch time. Over 450 personnel were at the consoles in the firing room.


Mission


Launch and flight to lunar orbit

An estimated one million spectators watched the launch of Apollo 11 from the highways and beaches in the vicinity of the launch site. Dignitaries included the Chief of Staff of the United States Army, General (United States), General William Westmoreland, four Cabinet of the United States, cabinet members, 19 Governor (United States), state governors, 40 Mayoralty in the United States, mayors, 60 ambassadors and 200 congressmen. Vice President of the United States, Vice President Spiro Agnew viewed the launch with former president Lyndon B. Johnson and his wife Lady Bird Johnson. Around 3,500 media representatives were present. About two-thirds were from the United States; the rest came from 55 other countries. The launch was televised live in 33 countries, with an estimated 25 million viewers in the United States alone. Millions more around the world listened to radio broadcasts. President Richard Nixon viewed the launch from his office in the White House with his NASA liaison officer, Apollo astronaut Frank Borman. Saturn V AS-506 launched Apollo 11 on July 16, 1969, at 13:32:00 UTC (9:32:00 Eastern Daylight Time, EDT). At 13.2 seconds into the flight, the launch vehicle began to Roll program, roll into its flight azimuth of 72.058°. Full shutdown of the first-stage engines occurred about 2minutes and 42 seconds into the mission, followed by separation of the S-IC and ignition of the S-II engines. The second stage engines then cut off and separated at about 9minutes and 8seconds, allowing the first ignition of the S-IVB engine a few seconds later. Apollo 11 entered a elliptic orbit, near-circular Earth orbit at an altitude of by , twelve minutes into its flight. After one and a half orbits, a second ignition of the S-IVB engine pushed the spacecraft onto its trajectory toward the Moon with the trans-lunar injection (TLI) burn at 16:22:13 UTC. About 30 minutes later, with Collins in the left seat and at the controls, the transposition, docking, and extraction maneuver was performed. This involved separating ''Columbia'' from the spent S-IVB stage, turning around, and docking with ''Eagle'' still attached to the stage. After the LM was extracted, the combined spacecraft headed for the Moon, while the rocket stage flew on a trajectory past the Moon. This was done to avoid the third stage colliding with the spacecraft, the Earth, or the Moon. A Gravity assist, slingshot effect from passing around the Moon threw it into an heliocentric orbit, orbit around the Sun. On July 19 at 17:21:50 UTC, Apollo 11 passed behind the Moon and fired its service propulsion engine to enter
lunar orbit In astronomy Astronomy (from el, ἀστρονομία, literally meaning the science that studies the laws of the stars) is a natural science that studies astronomical object, celestial objects and celestial event, phenomena. It uses m ...

lunar orbit
. In the thirty orbits that followed, the crew saw passing views of their landing site in the southern Sea of Tranquility about southwest of the crater Collins (crater), Sabine D. The site was selected in part because it had been characterized as relatively flat and smooth by the automated Ranger 8 and Surveyor 5 landers and the Lunar Orbiter mapping spacecraft, and because it was unlikely to present major landing or EVA challenges. It lay about southeast of the Surveyor5 landing site, and southwest of Ranger8's crash site.


Lunar descent

At 12:52:00 UTC on July 20, Aldrin and Armstrong entered ''Eagle'', and began the final preparations for lunar descent. At 17:44:00 ''Eagle'' separated from ''Columbia''. Collins, alone aboard ''Columbia'', inspected ''Eagle'' as it pirouetted before him to ensure the craft was not damaged, and that the landing gear was correctly deployed. Armstrong exclaimed: "The ''Eagle'' has wings!" As the descent began, Armstrong and Aldrin found themselves passing landmarks on the surface two or three seconds early, and reported that they were "long"; they would land miles west of their target point. ''Eagle'' was traveling too fast. The problem could have been mass concentration (astronomy), mascons—concentrations of high mass that could have altered the trajectory. Flight Director Gene Kranz speculated that it could have resulted from extra air pressure in the docking tunnel. Or it could have been the result of ''Eagle''s pirouette maneuver. Five minutes into the descent burn, and above the surface of the Moon, the Apollo Guidance Computer, LM guidance computer (LGC) distracted the crew with the first of several unexpected 1201 and 1202 program alarms. Inside Mission Control Center, computer engineer Jack Garman told Flight controller#GUIDO, Guidance Officer Steve Bales it was safe to continue the descent, and this was relayed to the crew. The program alarms indicated "executive overflows", meaning the guidance computer could not complete all its tasks in real time and had to postpone some of them. Margaret Hamilton (scientist), Margaret Hamilton, the Director of Apollo Flight Computer Programming at the MIT Charles Stark Draper Laboratory later recalled: During the mission, the cause was diagnosed as the rendezvous radar switch being in the wrong position, causing the computer to process data from both the rendezvous and landing radars at the same time. Software engineer Don Eyles concluded in a 2005 Guidance and Control Conference paper that the problem was due to a hardware design bug previously seen during testing of the first uncrewed LM in Apollo 5. Having the rendezvous radar on (so it was warmed up in case of an emergency landing abort) should have been irrelevant to the computer, but an electrical phasing mismatch between two parts of the rendezvous radar system could cause the stationary antenna to appear to the computer as dithering back and forth between two positions, depending upon how the hardware randomly powered up. The extra spurious cycle stealing, as the rendezvous radar updated an involuntary counter, caused the computer alarms.


Landing

When Armstrong again looked outside, he saw that the computer's landing target was in a boulder-strewn area just north and east of a crater (later determined to be West (lunar crater), West crater), so he took semi-automatic control. Armstrong considered landing short of the boulder field so they could collect geological samples from it, but could not since their horizontal velocity was too high. Throughout the descent, Aldrin called out navigation data to Armstrong, who was busy piloting ''Eagle''. Now above the surface, Armstrong knew their propellant supply was dwindling and was determined to land at the first possible landing site. Armstrong found a clear patch of ground and maneuvered the spacecraft towards it. As he got closer, now above the surface, he discovered his new landing site had a crater in it. He cleared the crater and found another patch of level ground. They were now from the surface, with only 90 seconds of propellant remaining. Lunar dust kicked up by the LM's engine began to impair his ability to determine the spacecraft's motion. Some large rocks jutted out of the dust cloud, and Armstrong focused on them during his descent so he could determine the spacecraft's speed. A light informed Aldrin that at least one of the probes hanging from ''Eagle'' footpads had touched the surface a few moments before the landing and he said: "Contact light!" Armstrong was supposed to immediately shut the engine down, as the engineers suspected the pressure caused by the engine's own exhaust reflecting off the lunar surface could make it explode, but he forgot. Three seconds later, ''Eagle'' landed and Armstrong shut the engine down. Aldrin immediately said "Okay, engine stop. ACA—out of detent." Armstrong acknowledged: "Out of detent. Auto." Aldrin continued: "Mode control—both auto. Descent engine command override off. Engine arm—off. 413 is in." ACA was the Attitude control, Attitude Control Assembly—the LM's control stick. Output went to the LGC to command the reaction control system (RCS) jets to fire. "Out of Detent" meant the stick had moved away from its centered position; it was spring-centered like the turn indicator in a car. LGC address 413 contained the variable that indicated the LM had landed. ''Eagle'' landed at 20:17:40 UTC on Sunday July 20 with of usable fuel remaining. Information available to the crew and mission controllers during the landing showed the LM had enough fuel for another 25 seconds of powered flight before an abort without touchdown would have become unsafe, but post-mission analysis showed that the real figure was probably closer to 50 seconds. Apollo 11 landed with less fuel than most subsequent missions, and the astronauts encountered a premature low fuel warning. This was later found to be the result of greater propellant 'slosh' than expected, uncovering a fuel sensor. On subsequent missions, extra anti-slosh baffles were added to the tanks to prevent this. Armstrong acknowledged Aldrin's completion of the post landing checklist with "Engine arm is off", before responding to the CAPCOM, Charles Duke, with the words, "Houston,
Tranquility Base Tranquility Base ( la, Statio Tranquillitatis) is the site on the Moon where, in July 1969, humans landed and walked on a celestial body other than Earth for the first time. On July 20, 1969, Apollo 11 crewmembers Neil Armstrong and Buzz Aldrin la ...
here. The ''Eagle'' has landed." Armstrong's unrehearsed change of call sign from "Eagle" to "Tranquility Base" emphasized to listeners that landing was complete and successful. Duke mispronounced his reply as he expressed the relief at Mission Control: "Roger, Twan—Tranquility, we copy you on the ground. You got a bunch of guys about to turn blue. We're breathing again. Thanks a lot." Two and a half hours after landing, before preparations began for the EVA, Aldrin radioed to Earth: He then took Eucharist, communion privately. At this time NASA was still fighting a lawsuit brought by atheist Madalyn Murray O'Hair (who had objected to the Apollo 8 Genesis reading, Apollo8 crew reading from the Book of Genesis) demanding that their astronauts refrain from broadcasting religious activities while in space. As such, Aldrin chose to refrain from directly mentioning taking communion on the Moon. Aldrin was an elder at the Webster, Texas, Webster Presbyterianism, Presbyterian Church, and his communion kit was prepared by the pastor of the church, Dean Woodruff. Webster Presbyterian possesses the chalice used on the Moon and commemorates the event each year on the Sunday closest to July 20. The schedule for the mission called for the astronauts to follow the landing with a five-hour sleep period, but they chose to begin preparations for the EVA early, thinking they would be unable to sleep.


Lunar surface operations

Preparations for
Neil Armstrong Neil Alden Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipp ...

Neil Armstrong
and
Buzz Aldrin Buzz Aldrin (; born Edwin Eugene Aldrin Jr., January 20, 1930) is an American former astronaut, engineer and fighter pilot. Aldrin made three extravehicular activity, spacewalks as pilot of the 1966 Gemini 12 mission, and as the lunar module ...

Buzz Aldrin
to walk on the Moon began at 23:43. These took longer than expected; three and a half hours instead of two. During training on Earth, everything required had been neatly laid out in advance, but on the Moon the cabin contained a large number of other items as well, such as checklists, food packets, and tools. Six hours and thirty-nine minutes after landing Armstrong and Aldrin were ready to go outside, and ''Eagle'' was depressurized. ''Eagle''s hatch was opened at 02:39:33. Armstrong initially had some difficulties squeezing through the hatch with his primary life support system, portable life support system (PLSS). Some of the highest heart rates recorded from Apollo astronauts occurred during LM egress and ingress. At 02:51 Armstrong began his descent to the lunar surface. The remote control unit on his chest kept him from seeing his feet. Climbing down the nine-rung ladder, Armstrong pulled a D-ring to deploy the modular equipment stowage assembly (MESA) folded against ''Eagle'' side and activate the TV camera. Apollo 11 used slow-scan television (TV) incompatible with broadcast TV, so it was displayed on a special monitor, and a conventional TV camera viewed this monitor, significantly reducing the quality of the picture. The signal was received at Goldstone Deep Space Communications Complex, Goldstone in the United States, but with better fidelity by Honeysuckle Creek Tracking Station near Canberra in Australia. Minutes later the feed was switched to the more sensitive Parkes Observatory, Parkes radio telescope in Australia. Despite some technical and weather difficulties, ghostly black and white images of the first lunar EVA were received and broadcast to at least 600 million people on Earth. Copies of this video in broadcast format were saved and are widely available, but Apollo 11 missing tapes, recordings of the original slow scan source transmission from the lunar surface were likely destroyed during routine magnetic tape re-use at NASA. After describing the surface dust as "very fine-grained" and "almost like a powder", at 02:56:15, six and a half hours after landing, Armstrong stepped off ''Eagle'' footpad and declared: "That's one small step for man, one giant leap for mankind." Armstrong intended to say "That's one small step for a man", but the word "a" is not audible in the transmission, and thus was not initially reported by most observers of the live broadcast. When later asked about his quote, Armstrong said he believed he said "for a man", and subsequent printed versions of the quote included the "a" in square brackets. One explanation for the absence may be that his accent caused him to slur the words "for a" together; another is the intermittent nature of the audio and video links to Earth, partly because of storms near Parkes Observatory. More recent digital analysis of the tape claims to reveal the "a" may have been spoken but obscured by static. Other analysis points to the claims of static and slurring as "face-saving fabrication", and that Armstrong himself later admitted to misspeaking the line. About seven minutes after stepping onto the Moon's surface, Armstrong collected a contingency soil sample using a sample bag on a stick. He then folded the bag and tucked it into a pocket on his right thigh. This was to guarantee there would be some lunar soil brought back in case an emergency required the astronauts to abandon the EVA and return to the LM. Twelve minutes after the sample was collected, he removed the TV camera from the MESA and made a panoramic sweep, then mounted it on a tripod. The TV camera cable remained partly coiled and presented a tripping hazard throughout the EVA. Still photography was accomplished with a Hasselblad camera which could be operated hand held or mounted on Armstrong's Apollo/Skylab A7L, Apollo space suit. Aldrin joined Armstrong on the surface. He described the view with the simple phrase: "Magnificent desolation." Armstrong said moving in the Gravitation of the Moon, lunar gravity, one-sixth of Earth's, was "even perhaps easier than the simulations ... It's absolutely no trouble to walk around." Aldrin joined him on the surface and tested methods for moving around, including two-footed kangaroo hops. The PLSS backpack created a tendency to tip backward, but neither astronaut had serious problems maintaining balance. Loping became the preferred method of movement. The astronauts reported that they needed to plan their movements six or seven steps ahead. The fine soil was quite slippery. Aldrin remarked that moving from sunlight into ''Eagle'' shadow produced no temperature change inside the suit, but the helmet was warmer in sunlight, so he felt cooler in shadow. The MESA failed to provide a stable work platform and was in shadow, slowing work somewhat. As they worked, the moonwalkers kicked up gray dust which soiled the outer part of their suits. The astronauts planted the Lunar Flag Assembly containing a flag of the United States on the lunar surface, in clear view of the TV camera. Aldrin remembered, "Of all the jobs I had to do on the Moon the one I wanted to go the smoothest was the flag raising." But the astronauts struggled with the telescoping rod and could only jam the pole about into the hard lunar surface. Aldrin was afraid it might topple in front of TV viewers. But he gave "a crisp West Point salute". Before Aldrin could take a photo of Armstrong with the flag, President Richard Nixon spoke to them through a telephone-radio transmission which Nixon called "the most historic phone call ever made from the White House." Nixon originally had a long speech prepared to read during the phone call, but Frank Borman, who was at the White House as a NASA liaison during Apollo 11, convinced Nixon to keep his words brief. They deployed the Early Apollo Scientific Experiments Package, EASEP, which included a passive seismic experiment package used to measure moonquakes and a Retroreflector#On the Moon, retroreflector array used for the lunar laser ranging experiment. Then Armstrong walked from the LM to snap photos at the rim of Little West (lunar crater), Little West Crater while Aldrin collected two core samples. He used the geologist's hammer to pound in the tubes—the only time the hammer was used on Apollo 11—but was unable to penetrate more than deep. The astronauts then collected rock samples using scoops and tongs on extension handles. Many of the surface activities took longer than expected, so they had to stop documenting sample collection halfway through the allotted 34 minutes. Aldrin shoveled of soil into the box of rocks in order to pack them in tightly. Two types of rocks were found in the geological samples: basalt and breccia. Three new minerals were discovered in the rock samples collected by the astronauts: armalcolite, tranquillityite, and pyroxferroite. Armalcolite was named after Armstrong, Aldrin, and Collins. All have subsequently been found on Earth. While on the surface, Armstrong uncovered a lunar plaque, plaque mounted on the LM ladder, bearing two drawings of Earth (of the Western and Eastern Hemispheres), an inscription, and signatures of the astronauts and President Nixon. The inscription read: At the behest of the Nixon administration to add a reference to God, NASA included the vague date as a reason to include A.D., which stands for Anno Domini, "in the year of our Lord" (although it should have been placed before the year, not after). Mission Control used a coded phrase to warn Armstrong his metabolic rates were high, and that he should slow down. He was moving rapidly from task to task as time ran out. As metabolic rates remained generally lower than expected for both astronauts throughout the walk, Mission Control granted the astronauts a 15-minute extension. In a 2010 interview, Armstrong explained that NASA limited the first moonwalk's time and distance because there was no empirical proof of how much cooling water the astronauts' PLSS backpacks would consume to handle their body heat generation while working on the Moon.


Lunar ascent

Aldrin entered ''Eagle'' first. With some difficulty the astronauts lifted film and two sample boxes containing of lunar surface material to the LM hatch using a flat cable pulley device called the Lunar Equipment Conveyor (LEC). This proved to be an inefficient tool, and later missions preferred to carry equipment and samples up to the LM by hand. Armstrong reminded Aldrin of a bag of memorial items in his sleeve pocket, and Aldrin tossed the bag down. Armstrong then jumped onto the ladder's third rung, and climbed into the LM. After transferring to LM life support, the explorers lightened the ascent stage for the return to lunar orbit by tossing out their PLSS backpacks, lunar overshoes, an empty Hasselblad camera, and other equipment. The hatch was closed again at 05:11:13. They then pressurized the LM and settled down to sleep. Presidential speech writer William Safire had prepared an ''In Event of Moon Disaster'' announcement for Nixon to read in the event the Apollo 11 astronauts were stranded on the Moon. The remarks were in a memo from Safire to Nixon's White House Chief of Staff H. R. Haldeman, in which Safire suggested a protocol the administration might follow in reaction to such a disaster. According to the plan, Mission Control would "close down communications" with the LM, and a clergyman would "commend their souls to the deepest of the deep" in a public ritual likened to burial at sea. The last line of the prepared text contained an allusion to Rupert Brooke's First World War poem, "The Soldier (poem), The Soldier". While moving inside the cabin, Aldrin accidentally damaged the circuit breaker that would arm the main engine for lift off from the Moon. There was a concern this would prevent firing the engine, stranding them on the Moon. A Marker pen, felt-tip pen was sufficient to activate the switch. After more than hours on the lunar surface, in addition to the scientific instruments, the astronauts left behind: an
Apollo 1 Apollo 1, initially designated AS-204, was the first crewed mission of the United States , the undertaking to land the first man on the Moon. It was planned to launch on February 21, 1967, as the first al test of the . The mission never flew; ...

Apollo 1
mission patch in memory of astronauts Roger B. Chaffee, Roger Chaffee,
Gus Grissom Virgil Ivan "Gus" Grissom (April 3, 1926 – January 27, 1967) was a United States Air Force The United States Air Force (USAF) is the Atmosphere of Earth, air military branch, service branch of the United States Armed Forces. It is one o ...
, and Ed White (astronaut), Edward White, who died when their command module caught fire during a test in January 1967; two memorial medals of Soviet cosmonauts Vladimir Komarov and
Yuri Gagarin Yuri Alekseyevich Gagarin; Gagarin's first name is sometimes transliterated as ''Yuriy'', ''Youri'', or ''Yury''. (9 March 1934 – 27 March 1968) was a Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (U ...
, who died in 1967 and 1968 respectively; a memorial bag containing a gold replica of an olive branch as a traditional symbol of peace; and a silicon message disk carrying the Apollo 11 goodwill messages, goodwill statements by Presidents Eisenhower, Kennedy, Johnson, and Nixon along with messages from leaders of 73 countries around the world. The disk also carries a listing of the leadership of the US Congress, a listing of members of the four committees of the House and Senate responsible for the NASA legislation, and the names of NASA's past and then-current top management. After about seven hours of rest, the crew was awakened by Houston to prepare for the return flight. Two and a half hours later, at 17:54:00 UTC, they lifted off in ''Eagle'' ascent stage to rejoin Collins aboard ''Columbia'' in lunar orbit. Film taken from the LM ascent stage upon liftoff from the Moon reveals the American flag, planted some from the descent stage, whipping violently in the exhaust of the ascent stage engine. Aldrin looked up in time to witness the flag topple: "The ascent stage of the LM separated ... I was concentrating on the computers, and Neil was studying the attitude indicator, but I looked up long enough to see the flag fall over." Subsequent Apollo missions planted their flags farther from the LM.


''Columbia'' in lunar orbit

During his day flying solo around the Moon, Collins never felt lonely. Although it has been said "not since Adam has any human known such solitude", Collins felt very much a part of the mission. In his autobiography he wrote: "this venture has been structured for three men, and I consider my third to be as necessary as either of the other two". In the 48 minutes of each orbit when he was out of radio contact with the Earth while ''Columbia'' passed round the far side of the Moon, the feeling he reported was not fear or loneliness, but rather "awareness, anticipation, satisfaction, confidence, almost exultation". One of Collins' first tasks was to identify the lunar module on the ground. To give Collins an idea where to look, Mission Control radioed that they believed the lunar module landed about off target. Each time he passed over the suspected lunar landing site, he tried in vain to find the module. On his first orbits on the back side of the Moon, Collins performed maintenance activities such as dumping excess water produced by the fuel cells and preparing the cabin for Armstrong and Aldrin to return. Just before he reached the dark side on the third orbit, Mission Control informed Collins there was a problem with the temperature of the coolant. If it became too cold, parts of ''Columbia'' might freeze. Mission Control advised him to assume manual control and implement Environmental Control System Malfunction Procedure 17. Instead, Collins flicked the switch on the system from automatic to manual and back to automatic again, and carried on with normal housekeeping chores, while keeping an eye on the temperature. When ''Columbia'' came back around to the near side of the Moon again, he was able to report that the problem had been resolved. For the next couple of orbits, he described his time on the back side of the Moon as "relaxing". After Aldrin and Armstrong completed their EVA, Collins slept so he could be rested for the rendezvous. While the flight plan called for ''Eagle'' to meet up with ''Columbia'', Collins was prepared for a contingency in which he would fly ''Columbia'' down to meet ''Eagle''.


Return

''Eagle'' rendezvoused with ''Columbia'' at 21:24 UTC on July 21, and the two docked at 21:35. ''Eagle''s ascent stage was jettisoned into lunar orbit at 23:41. Just before the
Apollo 12 Apollo 12 (November 14–24, 1969) was the sixth crewed flight in the United States Apollo program and the second to land on the Moon. It was launched on November 14, 1969, from the Kennedy Space Center, Florida. Commander Pete Conrad, Charles ...
flight, it was noted that ''Eagle'' was still likely to be orbiting the Moon. Later NASA reports mentioned that ''Eagle'' orbit had decayed, resulting in it impacting in an "uncertain location" on the lunar surface. On July 23, the last night before splashdown, the three astronauts made a television broadcast in which Collins commented: Aldrin added: Armstrong concluded: On the return to Earth, a bearing at the Guam tracking station failed, potentially preventing communication on the last segment of the Earth return. A regular repair was not possible in the available time but the station director, Charles Force, had his ten-year-old son Greg use his small hands to reach into the housing and pack it with grease. Greg was later thanked by Armstrong.


Splashdown and quarantine

The aircraft carrier , under the command of Captain (United States O-6), Captain Carl J. Seiberlich, was selected as the primary recovery ship (PRS) for Apollo 11 on June 5, replacing its sister ship, the Landing platform helicopter, LPH , which had recovered Apollo 10 on May 26. ''Hornet'' was then at her home port of Long Beach, California. On reaching Pearl Harbor on July 5, ''Hornet'' Embarkation, embarked the Sikorsky SH-3 Sea King helicopters of HS-4, a unit which specialized in recovery of Apollo spacecraft, specialized divers of Underwater Demolition Team, UDT Detachment Apollo, a 35-man NASA recovery team, and about 120 media representatives. To make room, most of ''Hornet''s air wing was left behind in Long Beach. Special recovery equipment was also loaded, including a Boilerplate (spaceflight), boilerplate command module used for training. On July 12, with Apollo 11 still on the launch pad, ''Hornet'' departed Pearl Harbor for the recovery area in the central Pacific, in the vicinity of . A presidential party consisting of Nixon, Borman, United States Secretary of State, Secretary of State William P. Rogers and National Security Advisor (United States), National Security Advisor Henry Kissinger flew to Johnston Atoll on Air Force One, then to the command ship in Marine One. After a night on board, they would fly to ''Hornet'' in Marine One for a few hours of ceremonies. On arrival aboard ''Hornet'', the party was greeted by the United States Pacific Command, Commander-in-Chief, Pacific Command (CINCPAC), Admiral (United States), Admiral John S. McCain Jr., and NASA Administrator Thomas O. Paine, who flew to ''Hornet'' from Pago Pago in one of ''Hornet''s carrier onboard delivery aircraft. Weather satellites were not yet common, but US Air Force Captain (United States O-3), Captain Hank Brandli had access to top secret spy satellite images. He realized that a storm front was headed for the Apollo recovery area. Poor visibility which could make locating the capsule difficult, and strong upper-level winds which "would have ripped their parachutes to shreds" according to Brandli, posed a serious threat to the safety of the mission. Brandli alerted Navy Captain Willard S. Houston Jr., the commander of the Joint Typhoon Warning Center, Fleet Weather Center at Pearl Harbor, who had the required security clearance. On their recommendation, Rear Admiral (United States), Rear Admiral Donald C. Davis, commander of Manned Spaceflight Recovery Forces, Pacific, advised NASA to change the recovery area, each man risking their careers. A new location was selected northeast. This altered the flight plan. A different sequence of computer programs was used, one never before attempted. In a conventional entry, P64 was followed by P67. For a skip-out re-entry, P65 and P66 were employed to handle the exit and entry parts of the skip. In this case, because they were extending the re-entry but not actually skipping out, P66 was not invoked and instead P65 led directly to P67. The crew were also warned they would not be in a full-lift (heads-down) attitude when they entered P67. The first program's acceleration subjected the astronauts to ; the second, to . Before dawn on July 24, ''Hornet'' launched four Sea King helicopters and three Grumman E-1 Tracers. Two of the E-1s were designated as "air boss" while the third acted as a communications relay aircraft. Two of the Sea Kings carried divers and recovery equipment. The third carried photographic equipment, and the fourth carried the decontamination swimmer and the flight surgeon. At 16:44 UTC (05:44 local time) ''Columbia''s drogue parachutes were deployed. This was observed by the helicopters. Seven minutes later ''Columbia'' struck the water forcefully east of Wake Island, south of Johnston Atoll, and from ''Hornet'', at . with seas and winds at from the east were reported under broken clouds at with visibility of at the recovery site. Reconnaissance aircraft flying to the original splashdown location reported the conditions Brandli and Houston had predicted. During splashdown, ''Columbia'' landed upside down but was righted within ten minutes by flotation bags activated by the astronauts. A diver from the Navy helicopter hovering above attached a sea anchor to prevent it from drifting. More divers attached flotation collars to stabilize the module and positioned rafts for astronaut extraction. The divers then passed biological isolation garments (BIGs) to the astronauts, and assisted them into the life raft. The possibility of bringing back pathogens from the lunar surface was considered remote, but NASA took precautions at the recovery site. The astronauts were rubbed down with a sodium hypochlorite solution and ''Columbia'' wiped with Betadine to remove any lunar dust that might be present. The astronauts were winched on board the recovery helicopter. BIGs were worn until they reached isolation facilities on board ''Hornet''. The raft containing decontamination materials was intentionally sunk. After touchdown on ''Hornet'' at 17:53 UTC, the helicopter was lowered by the elevator into the hangar bay, where the astronauts walked the to the Mobile Quarantine Facility (MQF), where they would begin the Earth-based portion of their 21 days of quarantine. This practice would continue for two more Apollo missions, Apollo 12 and
Apollo 14 Apollo 14 (January 31, 1971February 9, 1971) was the eighth crewed mission in the United States , the third to , and the first to land in the . It was the last of the "", landings at specific sites of scientific interest on the Moon for two-day ...
, before the Moon was proven to be barren of life, and the quarantine process dropped. Nixon welcomed the astronauts back to Earth. He told them: "[A]s a result of what you've done, the world has never been closer together before." After Nixon departed, ''Hornet'' was brought alongside the ''Columbia'', which was lifted aboard by the ship's crane, placed on a Dolly (trailer), dolly and moved next to the MQF. It was then attached to the MQF with a flexible tunnel, allowing the lunar samples, film, data tapes and other items to be removed. ''Hornet'' returned to Pearl Harbor, where the MQF was loaded onto a Lockheed C-141 Starlifter and airlifted to the Manned Spacecraft Center. The astronauts arrived at the Lunar Receiving Laboratory at 10:00 UTC on July 28. ''Columbia'' was taken to Ford Island for deactivation, and its pyrotechnics made safe. It was then taken to Hickham Air Force Base, from whence it was flown to Houston in a Douglas C-133 Cargomaster, reaching the Lunar Receiving Laboratory on July 30. In accordance with the Extra-Terrestrial Exposure Law, a set of regulations promulgated by NASA on July 16 to codify its quarantine protocol, the astronauts continued in quarantine. After three weeks in confinement (first in the Apollo spacecraft, then in their trailer on ''Hornet'', and finally in the Lunar Receiving Laboratory), the astronauts were given a clean bill of health. On August 10, 1969, the Interagency Committee on Back Contamination met in Atlanta and lifted the quarantine on the astronauts, on those who had joined them in quarantine (NASA physician William Carpentier and MQF project engineer John Hirasaki), and on ''Columbia'' itself. Loose equipment from the spacecraft remained in isolation until the lunar samples were released for study.


Celebrations

On August 13, the three astronauts rode in ticker-tape parades in their honor in New York and Chicago, with an estimated six million attendees. On the same evening in Los Angeles there was an official state dinner to celebrate the flight, attended by members of Congress, 44 governors, the Chief Justice of the United States, and ambassadors from 83 nations at the Century Plaza Hotel. Nixon and Agnew honored each astronaut with a presentation of the Presidential Medal of Freedom. The three astronauts spoke before a joint session of the United States Congress, joint session of Congress on September 16, 1969. They presented two US flags, one to the United States House of Representatives, House of Representatives and the other to the United States Senate, Senate, that they had carried with them to the surface of the Moon. The flag of American Samoa on Apollo 11 is on display at the Jean P. Haydon Museum in Pago Pago, the capital of American Samoa. This celebration began a 38-day world tour that brought the astronauts to 22 foreign countries and included visits with the leaders of many countries. The crew toured from September 29 to November 5. Many nations honored the first human Moon landing with special features in magazines or by issuing Apollo 11 commemorative postage stamps or coins.


Legacy


Cultural significance

Humans walking on the Moon and returning safely to Earth accomplished Kennedy's goal set eight years earlier. In Mission Control during the Apollo 11 landing, Kennedy's speech flashed on the screen, followed by the words "TASK ACCOMPLISHED, July 1969". The success of Apollo 11 demonstrated the United States' technological superiority; and with the success of Apollo 11, America had won the
Space Race The Space Race was a 20th-century competition between two Cold War The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, whi ...
. New phrases permeated into the English language. "If they can send a man to the Moon, why can't they ...?" became a common saying following Apollo 11. Armstrong's words on the lunar surface also spun off various parodies. While most people celebrated the accomplishment, disenfranchised Americans saw it as a symbol of the divide in America, evidenced by protesters outside of Kennedy Space Center the day before Apollo 11 launched. This is not to say they were not awed by it. Ralph Abernathy, leading a protest march, was so captivated by the spectacle of the Apollo 11 launch that he forgot what he was going to say. Racial and financial inequalities frustrated citizens who wondered why money spent on the Apollo program was not spent taking care of humans on Earth. A poem by Gil Scott-Heron called "Whitey on the Moon" illustrated the racial inequality in the United States that was highlighted by the Space Race. The poem starts with: Twenty percent of the world's population watched humans walk on the Moon for the first time. While Apollo 11 sparked the interest of the world, the follow-on Apollo missions did not hold the interest of the nation. One possible explanation was the shift in complexity. Landing someone on the Moon was an easy goal to understand; lunar geology was too abstract for the average person. Another is that Kennedy's goal of landing humans on the Moon had already been accomplished. A well-defined objective helped Project Apollo accomplish its goal, but after it was completed it was hard to justify continuing the lunar missions. While most Americans were proud of their nation's achievements in space exploration, only once during the late 1960s did the Gallup Poll indicate that a majority of Americans favored "doing more" in space as opposed to "doing less". By 1973, 59 percent of those polled favored cutting spending on space exploration. The Space Race had ended, and Cold War tensions were easing as the US and Soviet Union entered the era of détente. This was also a time when inflation was rising, which put pressure on the government to reduce spending. What saved the space program was that it was one of the few government programs that had achieved something great. Drastic cuts, warned Caspar Weinberger, the deputy director of the Office of Management and Budget, might send a signal that "our best years are behind us". After the Apollo 11 mission, officials from the Soviet Union said landing humans on the Moon was dangerous and unnecessary. At the time the Soviet Union was attempting to retrieve lunar samples robotically. The Soviets publicly denied there was a race to the Moon, and indicated they were not making an attempt. Mstislav Keldysh said in July 1969, "We are concentrating wholly on the creation of large satellite systems." It was revealed in 1989 that the Soviets had tried to send people to the Moon, but were unable due to technological difficulties. The public's reaction in the Soviet Union was mixed. The Soviet government limited the release of information about the lunar landing, which affected the reaction. A portion of the populace did not give it any attention, and another portion was angered by it. The Apollo 11 landing is referenced in the songs "Armstrong, Aldrin and Collins" by The Byrds on the 1969 album ''Ballad of Easy Rider (album), Ballad of Easy Rider'' and "Coon on the Moon" by Howlin' Wolf on the 1973 album ''The Back Door Wolf''.


Spacecraft

The Command Module Columbia, command module ''Columbia'' went on a tour of the United States, visiting 49 state capitals, the Washington, D.C., District of Columbia, and Anchorage, Alaska. In 1971, it was transferred to the Smithsonian Institution, and was displayed at the National Air and Space Museum (NASM) in Washington, DC. It was in the central ''Milestones of Flight'' exhibition hall in front of the Jefferson Drive entrance, sharing the main hall with other pioneering flight vehicles such as the ''Wright Flyer'', ''Spirit of St. Louis'', Bell X-1, North American X-15 and ''Friendship 7''. ''Columbia'' was moved in 2017 to the NASM Mary Baker Engen Restoration Hangar at the Steven F. Udvar-Hazy Center in Chantilly, Virginia, to be readied for a four-city tour titled ''Destination Moon: The Apollo 11 Mission''. This included Space Center Houston from October 14, 2017, to March 18, 2018, the Saint Louis Science Center from April 14 to September 3, 2018, the Senator John Heinz History Center in Pittsburgh from September 29, 2018, to February 18, 2019, and its last location at Museum of Flight in Seattle from March 16 to September 2, 2019. Continued renovations at the Smithsonian allowed time for an additional stop for the capsule, and it was moved to the Cincinnati Museum Center. The ribbon cutting ceremony was on September 29, 2019. For 40 years Armstrong's and Aldrin's space suits were displayed in the museum's ''Apollo to the Moon'' exhibit, until it permanently closed on December 3, 2018, to be replaced by a new gallery which was scheduled to open in 2022. A special display of Armstrong's suit was unveiled for the 50th anniversary of Apollo 11 in July 2019. The quarantine trailer, the flotation collar and the flotation bags are in the Smithsonian's Steven F. Udvar-Hazy Center annex near Washington Dulles International Airport in Chantilly, Virginia, where they are on display along with a test lunar module. The descent stage of the LM ''Eagle'' remains on the Moon. In 2009, the Lunar Reconnaissance Orbiter (LRO) imaged the various Apollo landing sites on the surface of the Moon, for the first time with sufficient resolution to see the descent stages of the lunar modules, scientific instruments, and foot trails made by the astronauts. The remains of the ascent stage lie at an unknown location on the lunar surface, after being abandoned and impacting the Moon. The location is uncertain because ''Eagle'' ascent stage was not tracked after it was jettisoned, and the lunar gravity field is sufficiently non-uniform to make the orbit of the spacecraft unpredictable after a short time. In March 2012 a team of specialists financed by Amazon.com, Amazon founder Jeff Bezos located the Rocketdyne F-1, F-1 engines from the S-IC stage that launched Apollo 11 into space. They were found on the Atlantic seabed using advanced sonar scanning. His team brought parts of two of the five engines to the surface. In July 2013, a conservator discovered a serial number under the rust on one of the engines raised from the Atlantic, which NASA confirmed was from Apollo 11. The S-IVB third stage which performed Apollo 11's trans-lunar injection remains in a solar orbit near to that of Earth.


Moon rocks

The main repository for the Apollo Moon rocks is the Lunar Sample Laboratory Facility at the Lyndon B. Johnson Space Center in
Houston, Texas Houston ( ) is the most populous city The United Nations uses three definitions for what constitutes a city, as not all cities in all jurisdictions are classified using the same criteria. Cities may be defined as the city proper, cities pr ...
. For safekeeping, there is also a smaller collection stored at White Sands Test Facility near Las Cruces, New Mexico. Most of the rocks are stored in nitrogen to keep them free of moisture. They are handled only indirectly, using special tools. Over 100 research laboratories around the world conduct studies of the samples, and approximately 500 samples are prepared and sent to investigators every year. In November 1969, Nixon asked NASA to make up about 250 presentation Apollo 11 lunar sample displays for 135 nations, the fifty states of the United States and its possessions, and the United Nations. Each display included Moon dust from Apollo 11. The rice-sized particles were four small pieces of Moon soil weighing about 50 mg and were enveloped in a clear acrylic button about as big as a Half dollar (United States coin), United States half dollar coin. This acrylic button magnified the grains of lunar dust. The Apollo 11 lunar sample displays were given out as goodwill gifts by Nixon in 1970.


Experiment results

The Passive Seismic Experiment ran until the command uplink failed on August 25, 1969. The downlink failed on December 14, 1969. , the Lunar Laser Ranging experiment remains operational.


Armstrong's camera

Armstrong's Hasselblad camera was thought to be lost or left on the Moon surface. In 2015, after Armstrong died in 2012, his widow contacted the National Air and Space Museum to inform them she had found a white cloth bag in one of Armstrong's closets. The bag contained a forgotten camera that had been used to capture images of the first Moon landing. The camera is currently on display at the National Air and Space Museum.


Anniversary events


40th anniversary

On July 15, 2009, Life (magazine), Life.com released a photo gallery of previously unpublished photos of the astronauts taken by ''Life'' photographer Ralph Morse prior to the Apollo 11 launch. From July 16 to 24, 2009, NASA streamed the original mission audio on its website in real time 40 years to the minute after the events occurred. It is in the process of restoring the video footage and has released a preview of key moments. In July 2010, air-to-ground voice recordings and film footage shot in Mission Control during the Apollo 11 powered descent and landing was re-synchronized and released for the first time. The John F. Kennedy Presidential Library and Museum set up an Adobe Flash website that rebroadcasts the transmissions of Apollo 11 from launch to landing on the Moon. On July 20, 2009, Armstrong, Aldrin, and Collins met with US President Barack Obama at the White House. "We expect that there is, as we speak, another generation of kids out there who are looking up at the sky and are going to be the next Armstrong, Collins, and Aldrin", Obama said. "We want to make sure that NASA is going to be there for them when they want to take their journey." On August 7, 2009, an act of Congress awarded the three astronauts a Congressional Gold Medal, the highest civilian award in the United States. The bill was sponsored by Florida Senator Bill Nelson (politician), Bill Nelson and Florida Representative Alan Grayson. A group of British scientists interviewed as part of the anniversary events reflected on the significance of the Moon landing:


50th anniversary

On June 10, 2015, Congressman Bill Posey introduced resolution H.R. 2726 to the 114th session of the United States House of Representatives directing the United States Mint to design and sell commemorative coins in gold, silver and clad for the 50th anniversary of the Apollo 11 mission. On January 24, 2019, the Mint released the Apollo 11 Fiftieth Anniversary commemorative coins to the public on its website. A documentary film, ''Apollo 11 (2019 film), Apollo 11'', with restored footage of the 1969 event, premiered in IMAX on March 1, 2019, and broadly in theaters on March 8. The Smithsonian Institute's National Air and Space Museum and
NASA The National Aeronautics and Space Administration (NASA; ) is an independent agencies of the United States government, independent agency of the Federal government of the United States, U.S. federal government responsible for the civilian Li ...

NASA
sponsored the "Apollo 50 Festival" on the National Mall in Washington DC. The three day (July 18 to 20, 2019) outdoor festival featured hands-on exhibits and activities, live performances, and speakers such as Adam Savage and NASA scientists. As part of the festival, a projection of the tall
Saturn V Saturn V was an American human-rated super heavy-lift launch vehicle used by NASA between 1967 and 1973. A multistage rocket, three-stage, liquid-propellant rocket, liquid-fueled rocket, the Saturn V was developed under the Apollo program for ...

Saturn V
rocket was displayed on the east face of the tall Washington Monument from July 16 through the 20th from 9:30pm until 11:30pm (EDT). The program also included a 17-minute show that combined full-motion video projected on the Washington Monument to recreate the assembly and launch of the
Saturn V Saturn V was an American human-rated super heavy-lift launch vehicle used by NASA between 1967 and 1973. A multistage rocket, three-stage, liquid-propellant rocket, liquid-fueled rocket, the Saturn V was developed under the Apollo program for ...

Saturn V
rocket. The projection was joined by a wide recreation of the
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island Merritt Island is a census-designated place A census-designated place (CDP) is a Place (United States Census Bureau ...

Kennedy Space Center
countdown clock and two large video screens showing archival footage to recreate the time leading up to the moon landing. There were three shows per night on July 19–20, with the last show on Saturday, delayed slightly so the portion where Armstrong first set foot on the Moon would happen exactly 50 years to the second after the actual event. On July 19, 2019, the Google Doodle paid tribute to the Apollo 11 Moon Landing, complete with a link to an animated YouTube video with voiceover by astronaut Michael Collins. Aldrin, Collins, and Armstrong's sons were hosted by President Donald Trump in the Oval Office.


Films and documentaries

* ''Footprints on the Moon (1969 film), Footprints on the Moon'', a 1969 documentary film by Bill Gibson and Barry Coe, about the Apollo 11 mission * ''Moonwalk One'', a 1971 documentary film by Theo Kamecke * ''Apollo 11: As it Happened'', a 1994 six-hour documentary on ABC News' coverage of the event * ''Apollo 11 (2019 film), Apollo 11'', a 2019 documentary film by Todd Douglas Miller with restored footage of the 1969 event * ''Chasing the Moon (2019 film), Chasing the Moon'', a July 2019 PBS three-night six-hour documentary, directed by Robert Stone (director), Robert Stone, examined the events leading up to the Apollo 11 mission. An accompanying book of the same name was also released. * ''8 Days: To the Moon and Back'', a PBS and BBC Studios 2019 documentary film by Anthony Philipson re-enacting major portions of the Apollo 11 mission using mission audio recordings, new studio footage, NASA and news archives, and computer-generated imagery.


See also

* * * * Moon landing conspiracy theories


References


Notes


Citations

In some of the following sources, times are shown in the format ''hours:minutes:seconds'' (e.g. 109:24:15), referring to the mission's Ground Elapsed Time (GET), based on the official launch time of July 16, 1969, 13:32:00 UTC (000:00:00 GET).


Sources

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *


External links


"Apollo 11 transcripts"
a
Spacelog

Apollo 11 in real time


Multimedia

* —Remastered videos of the original landing.
Dynamic timeline of lunar excursion
Lunar Reconnaissance Orbiter Camera * *
Apollo 11 Restored EVA Part 1
(1h of restored footage)

''The New York Times'', Interactive, July 18, 2019
"Coverage of the Flight of Apollo 11"
provided by Todd Kosovich for RadioTapes.com. Radio station recordings (airchecks) covering the flight of Apollo 11. {{Authority control Apollo 11, Buzz Aldrin Neil Armstrong Michael Collins (astronaut) Apollo program missions 1969 on the Moon Soft landings on the Moon Spacecraft launched by Saturn rockets Articles containing video clips Crewed missions to the Moon