A Mars sample-return (MSR) mission is a proposed mission to collect rock and dust samples on

Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide () atmosphere. At the average surface level the atmosph ...

and return them to

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

. Such a mission would allow more extensive analysis than that allowed by onboard sensors. Risks of cross-contamination of the Earth biosphere from returned Martian samples have been raised, though the risk of this occurring is considered to be low. The most recent concepts are a NASA-ESA proposal; a CNSA proposal, Tianwen-3; a

Roscosmos The State Corporation for Space Activities "Roscosmos", commonly known simply as Roscosmos (), is a State corporation (Russia), state corporation of the Russian Federation responsible for space science, space flights, List of space agencies, c ...

proposal,

Mars-Grunt Mars-Grunt, also known as Expedition-M (), is a proposed robotic Mars sample-return mission.Perseverance'' rover.

Scientific value

Once returned to Earth, stored samples can be studied with the most sophisticated science instruments available. Thomas Zurbuchen, associate administrator for science at NASA Headquarters in Washington, expects such studies to allow several new discoveries at many fields. Samples may be reanalyzed in the future by instruments that do not yet exist. In 2006, the Mars Exploration Program Analysis Group identified 55 important investigations related to Mars exploration. In 2008, they concluded that about half of the investigations "could be addressed to one degree or another by MSR", making MSR "the single mission that would make the most progress towards the entire list" of investigations. Moreover, it was reported that a significant fraction of the investigations could not be meaningfully advanced without returned samples. One source of Mars samples is what are thought to be

Martian meteorite A Martian meteorite is a rock that formed on Mars, was ejected from the planet by an impact event, and traversed interplanetary space before landing on Earth as a meteorite. , 277 meteorites had been classified as Martian, less than half a perce ...

s, which are rocks ejected from Mars that made their way to Earth. , 356 meteorites had been identified as Martian, out of over 79,000 known meteorites. These meteorites are believed to be from Mars because their elemental and isotopic compositions are similar to rocks and atmospheric gases analyzed on Mars.

History

Before 1990

A COMPENDIUM OF FUTURE SPACE ACTIVITIES - NARA - 17476650

Returning from Mars appeared in technical literature when

Apollo Apollo is one of the Twelve Olympians, Olympian deities in Ancient Greek religion, ancient Greek and Ancient Roman religion, Roman religion and Greek mythology, Greek and Roman mythology. Apollo has been recognized as a god of archery, mu ...

was still in development and the first spacecraft to fly past Mars had not yet launched, with an expectation that people would be on board for Mars ascent. The density of the Mars atmosphere remained unknown at that time, so the Lockheed engineering author reported the analysis of trajectory options over a range of aerodynamic drag conditions for a 15-ton launch vehicle to reach a rendezvous orbit. At NASA, returning samples from Mars was studied jointly by the

Langley Research Center The Langley Research Center (LaRC or NASA Langley), located in Hampton, Virginia, near the Chesapeake Bay front of Langley Air Force Base, is the oldest of NASA's field centers. LaRC has focused primarily on aeronautical research but has also ...

and the

Jet Propulsion Laboratory The Jet Propulsion Laboratory (JPL) is a Federally funded research and development centers, federally funded research and development center (FFRDC) in La Cañada Flintridge, California, Crescenta Valley, United States. Founded in 1936 by Cali ...

in the early 1970s during the time that the Viking Mars lander mission was in development, and a Langley author noted that the "Mars surface-to-orbit launch vehicle" would need high performance because its mass would "have a substantial impact on the mass and systems requirements" for earlier mission phases, delivery of that vehicle to Mars and launch preparations on Mars. For at least three decades, scientists have advocated the return of geological samples from Mars. One early concept was the Sample Collection for Investigation of Mars (SCIM) proposal, which involved sending a spacecraft in a grazing pass through Mars's upper atmosphere to collect dust and air samples without landing or orbiting. The

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

considered a Mars sample-return mission, Mars 5NM, in 1975 but it was cancelled due to the repeated failures of the N1 rocket that would have launched it. Another sample-return mission, Mars 5M (Mars-79), planned for 1979, was cancelled due to complexity and technical problems. In the mid-1980's, JPL mission planners noted that MSR had been "pushed by budgetary and other pressures into the '90s," and that the round trip would "impose large propulsion requirements." They presented a notional mass budget for a concept that would launch a 9.5-metric-ton payload from Earth, including a Mars orbiter for Earth return, and a lander having a 400-kg rover and a "Mars return vehicle" that would mass over 2 metric tons. A 20-kg sample canister would arrive at Earth containing 5 kg of samples including scientific-quality cores drilled from every type of Mars terrain. In the late 1980s, multiple NASA centers contributed to a proposed Mars Rover Sample Return mission (MRSR). As described by JPL authors, one option for MRSR relied on a single launch of a 12-ton package including a Mars orbiter and Earth return vehicle, a 700-kg rover, and a 2.7-ton Mars ascent vehicle (MAV) which would use pump-fed liquid propulsion for a significant mass saving. A 20-kg sample package on the MAV was to contain 5 kg of Mars soil. A Johnson Space Center author subsequently referred to a launch from Earth in 1998 with a MAV mass in the range 1400 to 1500 kg including a pump-fed first stage and a pressure-fed second stage.

1990 onward

Mars In-Situ Resource UtilizationSample Return MISR

The United States'

Mars Exploration Program Mars Exploration Program (MEP) is a long-term effort Exploration of Mars, to explore the planet Mars, funded and led by NASA. Formed in 1993, MEP has made use of orbital spacecraft, lander (spacecraft), landers, and Mars rovers to explore the p ...

, formed after ''

Mars Observer The ''Mars Observer'' spacecraft, also known as the ''Mars Geoscience/Climatology Orbiter'', was a Robotic spacecraft, robotic space probe launched by NASA on September 25, 1992, to study the Martian surface, atmosphere, climate and magnetic fie ...

'' failure in September 1993, supported a Mars sample return. One architecture was proposed by Glenn J. MacPherson in the early 2000s. In 1996, the possibility of

life on Mars The possibility of life on Mars is a subject of interest in astrobiology due to the planet's proximity and similarities to Earth. To date, no conclusive evidence of past or present life has been found on Mars. Cumulative evidence suggests that ...

was raised when apparent microfossils were thought to have been found in the Martian meteorite ALH84001. This hypothesis was eventually rejected, but led to a renewed interest in a Mars sample return. In the mid-1990s, NASA funded JPL and

Lockheed Martin The Lockheed Martin Corporation is an American Arms industry, defense and aerospace manufacturer with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta on March 15, 1995. It is headquartered in North ...

to study affordable small-scale MSR mission architectures including a concept to return 500 grams of Mars samples using a 100-kg MAV that would meet a small Mars orbiter for rendezvous and return to Earth.

Robert Zubrin Robert Zubrin (; born April 9, 1952) is an American aerospace engineer, author, and advocate for human exploration of Mars. He is also an advocate for U.S. space superiority, writing that "in the 21st century, victory on land, sea or in the air ...

, a long-time advocate for human Mars missions, concluded in 1996 that the best approach to MSR would be launching directly to Earth using propellants made on Mars, because a rendezvous in Mars orbit would be too risky and he estimated that a direct-return MAV would mass 500 kg, too heavy to send to Mars affordably if fully fueled on Earth. International peer reviewers concurred. In 1997, a detailed analysis of conventional small-scale rocket technology (both solid and liquid propellant) found that known propulsion components would be too heavy to build a MAV as lightweight as several hundred kilograms and "The application of launch vehicle design principles to the development of new hardware on a tiny scale" was suggested. In 1998, JPL presented a design for a two-stage pressure-fed liquid bipropellant MAV that would be 600 kilograms or less at Mars liftoff, intended for a MSR mission in 2005. The same JPL author collaborated on a notional single-stage 200-kg MAV intended to be made small by using pump-fed propulsion to permit lightweight low-pressure liquid propellant tanks and compact high-pressure thrust chambers. This mass advantage of pump-fed operation was applied to a conceptual 100-kg MAV having a mass budget consistent with reaching Mars orbit using monopropellant, partly enabled by the simplicity of a single tank, also applicable to Mars landing typically done with monopropellant. The high-pressure thrusters and pump had previously been demonstrated in the 1994 flight of an experimental 21-kg rocket. As of late 1999, the MSR mission was anticipated to be launched from Earth in 2003 and 2005. Each was to deliver a rover and a Mars ascent vehicle, and a French supplied Mars orbiter with Earth return capability was to be included in 2005. The 140-kg MAV, "in the process of being contracted to industry" at that time, was to include telemetry on its first stage and thrusters that would spin the vehicle to 300 RPM before separation of the simplified lightweight upper stage. Atop each MAV, a 3.6-kg, 16-cm diameter spherical payload would contain 500 grams of samples and have solar cells to power a long-life beacon to facilitate rendezvous with the Earth return orbiter. The orbiter would capture the sample containers delivered by both MAVs and place them in separate Earth entry vehicles. This mission concept, considered by NASA's

to return samples by 2008, was cancelled following a program review. In mid-2006, the International Mars Architecture for the Return of Samples (iMARS) Working Group was chartered by the International Mars Exploration Working Group (IMEWG) to outline the scientific and engineering requirements of an internationally sponsored and executed Mars sample-return mission in the 2018–2023 time frame. In October 2009,

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, US federal government responsible for the United States ...

and ESA established the Mars Exploration Joint Initiative to proceed with the

ExoMars ExoMars (Exobiology on Mars) is an astrobiology programme of the European Space Agency (ESA). The goals of ExoMars are to search for signs of past life on Mars, investigate how the Martian water and geochemical environment varies, investigate ...

program, whose ultimate aim is "the return of samples from Mars in the 2020s". ExoMars's first mission was planned to launch in 2018 with unspecified missions to return samples in the 2020–2022 time frame. The cancellation of the caching rover MAX-C in 2011, and later NASA withdrawal from ExoMars, due to budget limitations, ended the mission. The pull-out was described as "traumatic" for the science community. In early 2011, the US National Research Council's Planetary Science Decadal Survey, which laid out mission planning priorities for the period 2013–2022, declared an MSR campaign its highest priority Flagship Mission for that period. In particular, it endorsed the proposed Mars Astrobiology Explorer-Cacher (MAX-C) mission in a "descoped" (less ambitious) form. This mission plan was officially cancelled in April 2011. A key mission requirement for the

Mars 2020 Mars 2020 is a NASA mission that includes the rover ''Perseverance (rover), Perseverance'', the now-retired small robotic helicopter ''Ingenuity (helicopter), Ingenuity'', and associated delivery systems, as part of the Mars Exploration Progra ...

''Perseverance'' rover mission was that it help prepare for MSR. The

rover Rover may refer to: People Name * Constance Rover (1910–2005), English historian * Jolanda de Rover (born 1963), Dutch swimmer * Rover Thomas (c. 1920–1998), Indigenous Australian artist Stage name * Rover (musician), French singer-songw ...

landed on 18 February 2021 in

Jezero Crater Jezero is a Impact crater, crater on Mars in the Syrtis Major quadrangle, about in diameter. Thought to have once been flooded with water, the crater contains a fan-river delta, delta deposit rich in clays. The lake in the crater was present w ...

to collect samples and store them in 43 cylindrical tubes for later retrieval. 6th Perseverance Rock Sample Malay at Three Forks Sample Depot

Mars 2020 mission

Perseverance-Selfie-at-Rochette-Horizontal-V2

The

mission landed the ''Perseverance'' rover in the

Jezero crater Jezero is a Impact crater, crater on Mars in the Syrtis Major quadrangle, about in diameter. Thought to have once been flooded with water, the crater contains a fan-river delta, delta deposit rich in clays. The lake in the crater was present w ...

in February 2021. It has collected multiple samples and will continue to do so, packing them into cylinders for later return in the MSR Campaign. Jezero appears to be an ancient lakebed, suitable for ground sampling. It is also assigned the task to return the samples directly to the Sample Return lander, considering its potential mission longevity. Mars Sample Depot at 3 forks

From December 21, 2022, ''Perseverance'' started a campaign to deposit 10 of its collected samples to the backup depot (Three Forks), to ensure that if ''Perseverance'' runs into problems, the MSR campaign could still succeed.

Proposals

NASA–ESA

PIA25326-MarsSampleReturnProgram-20220727

The NASA-ESA plan is to return samples using three missions: a sample collection mission (Perseverance) launched in 2020 and currently operational, a sample retrieval mission (Sample Retrieval Lander + Mars ascent vehicle + Sample Transfer arm + 2 Ingenuity class helicopters), and a return mission (Earth Return Orbiter). Although NASA and ESA's proposal is still in the design stage, the first leg of gathering samples is currently being executed by the ''Perseverance'' rover on Mars and components of the sample retrieval lander (second leg) are in testing phase on earth. The later phases were facing significant cost overruns as of August 2023. In November 2023, NASA was reported to have cut back the program due to a possible shortage of funds. As of January 2024, the plan was facing ongoing scrutiny due to budget and scheduling considerations, and a new overhaul plan was being pursued. In April 2024, NASA reported that the originally projected cost of $7 billion and expected sample return of 2033 was updated to an unacceptable $11 billion and return of 2040 instead, prompting the agency to search for a better solution.

China

China has announced plans for a Mars sample-return mission to be called Tianwen-3. The mission would launch in late-2028, with a lander and ascent vehicle on a

Long March 5 Long March 5 (LM-5; zh, s=长征五号 , p=Chángzhēng wǔ hào) or Changzheng 5 (CZ-5), also known by its nickname "''Pang-Wu''" (胖五, "''Fat-Five''"), is a Chinese heavy-lift launch vehicle developed by the China Academy of Launch Vehicl ...

and an orbiter and return module launched separately on a

Long March 3B The Long March 3B (), also known as the CZ-3B and LM-3B, is a Chinese orbital launch vehicle. Introduced in 1996, it is launched from Launch Area 2 and 3 at the Xichang Satellite Launch Center in Sichuan. A three-stage rocket with four strap-on ...

. Samples would be returned to Earth in July 2031. A previous plan would have used a large spacecraft that could carry out all mission phases, including sample collection, ascent, orbital rendezvous, and return flight. This would have required the super-heavy-lift

Long March 9 Long March 9 (, LM-9 or Changzheng 9, CZ-9) is a Chinese Super heavy-lift launch vehicle, super-heavy carrier rocket that is currently under development. It is the ninth iteration of the Long March (rocket family), Long March rocket family, named ...

launch vehicle. Another plan involved using

Tianwen-1 -1 ( zh , s = 天问一号) (also referred to as TW-1) is an interplanetary mission by the China National Space Administration (CNSA) which sent a robotic spacecraft to Mars, consisting of 6 spacecraft: an orbiter, two deployable cameras, lan ...

to cache the samples for retrieval.

France

France has worked towards a sample return for many years. This included concepts of an extraterrestrial sample curation facility for returned samples, and numerous proposals. They worked on the development of a Mars sample-return orbiter, which would capture and return the samples as part of a joint mission with other countries.

Japan

On 9 June 2015, the

Japanese Aerospace Exploration Agency The is the Japanese national air and space agency. Through the merger of three previously independent organizations, JAXA was formed on 1 October 2003. JAXA is responsible for research, technology development and launch of satellites into or ...

(JAXA) unveiled a plan named Martian Moons Exploration (MMX) to retrieve samples from Phobos or Deimos. Phobos's orbit is closer to Mars and its surface may have captured particles blasted from Mars. The launch from Earth is planned for 2026, with a return to Earth in 2031.MMX Homepage (English version)
JAXA 2017 Japan has also shown interest in participating in an international Mars sample-return mission.

Russia

A Russian Mars sample-return mission concept is

Mars-Grunt Mars-Grunt, also known as Expedition-M (), is a proposed robotic Mars sample-return mission. It adopted

Fobos-Grunt Fobos-Grunt or Phobos-Grunt () was an attempted Russian sample return mission to Phobos (moon), Phobos, one of the moons of Mars. Fobos-Grunt also carried the Chinese Mars orbiter Yinghuo-1 and the tiny Living Interplanetary Flight Experiment f ...

design heritage. 2011 plans envisioned a two-stage architecture with an orbiter and a lander (but no roving capability), with samples gathered from around the lander by a robotic arm.

Back contamination

Whether life forms exist on Mars is unresolved. Thus, MSR could potentially transfer viable organisms to Earth, resulting in back contamination — the introduction of extraterrestrial organisms into Earth's biosphere. The scientific consensus is that the potential for large-scale effects, either through pathogenesis or ecological disruption, is small.European Science Foundation – Mars Sample Return backward contamination – Strategic advice and requirements
July 2012, – see Back Planetary Protection section (for more details of the document se
abstract
Joshua Lederber
Parasites Face a Perpetual Dilemma
Volume 65, Number 2, 1999/ American Society for Microbiology News 77 Mars Sample Return: Issues and Recommendations
Task Group on Issues in Sample Return, National Academies Press, Washington, D.C. (1997) Returned samples would be treated as potentially biohazardous until scientists decide the samples are safe. The goal is that the probability of release of a Mars particle is less than one in a million. The proposed NASA Mars sample-return mission will not be approved by NASA until the

National Environmental Policy Act The National Environmental Policy Act (NEPA) is a United States environmental law designed to promote the enhancement of the environment. It created new laws requiring U.S. federal government agencies to evaluate the environmental impacts of ...

(NEPA) process has been completed. Mars Sample Return Discussions As presented on February 23, 2010 Furthermore, under the terms of Article VII of the

Outer Space Treaty The Outer Space Treaty, formally the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, is a Multilateralism, multilateral treaty that forms the bas ...

and other legal frameworks, were a release of organisms to occur, the releasing nation(s) would be liable for any resultant damages. The sample-return mission would be tasked with preventing contact between the Martian environment and the exterior of the sample containers. In order to eliminate the risk of parachute failure, the current plan is to use the thermal protection system to cushion the capsule upon impact (at

terminal velocity Terminal velocity is the maximum speed attainable by an object as it falls through a fluid (air is the most common example). It is reached when the sum of the drag force (''Fd'') and the buoyancy is equal to the downward force of gravity (''FG ...

). The sample container would be designed to withstand the force of impact. To receive the returned samples, NASA proposed a custom Biosafety Level 4 containment facility, the Mars Sample-Return Receiving facility (MSRRF). Other scientists and engineers, notably

of the

Mars Society The Mars Society is a nonprofit organization that advocates for human exploration and colonization of Mars. It was founded by Robert Zubrin in 1998 and its principles are based on Zubrin's Mars Direct philosophy, which aims to make human miss ...

, argued in the '' Journal of Cosmology'' that contamination risk is functionally zero leaving little need to worry. They cite, among other things, lack of any known incident although trillions of kilograms of material have been exchanged between Mars and Earth via meteorite impacts. The International Committee Against Mars Sample Return (ICAMSR) is an

advocacy Advocacy is an Action (philosophy), activity by an individual or advocacy group, group that aims to influence decision making, decisions within political, economic, and social institutions. Advocacy includes activities and publications to infl ...

group led by Barry DiGregorio, that campaigns against a Mars sample-return mission. While ICAMSR acknowledges a low probability for biohazards, it considers the proposed containment measures to be unsafe. ICAMSR advocates more ''in situ'' studies on Mars, and preliminary biohazard testing at the

International Space Station The International Space Station (ISS) is a large space station that was Assembly of the International Space Station, assembled and is maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United ...

before the samples are brought to Earth. DiGregorio also supports a view that several pathogens – such as common viruses – originate in space and probably caused some

mass extinction An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth. Such an event is identified by a sharp fall in the diversity and abundance of multicellular organisms. It occ ...

s and

pandemic A pandemic ( ) is an epidemic of an infectious disease that has a sudden increase in cases and spreads across a large region, for instance multiple continents or worldwide, affecting a substantial number of individuals. Widespread endemic (epi ...

s. These claims connecting terrestrial disease and extraterrestrial pathogens have been rejected by the scientific community.

References

External links

Mars Sample return media reel
produced by NASA and JPL (video) {{Astrobiology Chinese space probes European Space Agency space probes Missions to Mars Proposed astrobiology space missions Proposed NASA space probes *