Columbia Accident
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The Space Shuttle ''Columbia'' disaster was a fatal accident in the United States space program that occurred on February 1, 2003. During the STS-107 mission, Space Shuttle ''Columbia'' disintegrated as it reentered the atmosphere over Texas, killing all seven astronauts on board. The mission was the second that ended in disaster in the Space Shuttle program after the loss of ''Challenger'' and all seven crew members during ascent in 1986. During the STS-107 launch, a piece of the insulative foam broke off from the Space Shuttle external tank and struck the thermal protection system tiles on the orbiter's left wing. Similar foam shedding had occurred during previous Space Shuttle launches, causing damage that ranged from minor to near-catastrophic, but some engineers suspected that the damage to ''Columbia'' was more serious. Before reentry, NASA managers had limited the investigation, reasoning that the crew could not have fixed the problem if it had been confirmed. When ''Columbia'' reentered the atmosphere of Earth, the damage allowed hot atmospheric gases to penetrate the
heat shield In thermodynamics, heat is defined as the form of energy crossing the boundary of a thermodynamic system by virtue of a temperature difference across the boundary. A thermodynamic system does not ''contain'' heat. Nevertheless, the term is al ...
and destroy the internal wing structure, which caused the orbiter to become unstable and break apart. After the disaster, Space Shuttle flight operations were suspended for more than two years, as they had been after the ''Challenger'' disaster. Construction of the International Space Station (ISS) was paused until flights resumed in July 2005 with
STS-114 STS-114 was the first "Return to Flight" Space Shuttle mission following the Space Shuttle Columbia disaster, Space Shuttle ''Columbia'' disaster. Space Shuttle Discovery, ''Discovery'' launched at 10:39 Eastern Time Zone, EDT (14:39 Coordinated ...
. NASA made several technical and organizational changes to subsequent missions, including adding an on-orbit inspection to determine how well the orbiter's thermal protection system (TPS) had endured the ascent, and keeping a designated rescue mission ready in case irreparable damage was found. Except for one mission to repair the Hubble Space Telescope, subsequent Space Shuttle missions were flown only to the ISS to allow the crew to use it as a haven if damage to the orbiter prevented safe reentry; the remaining orbiters were retired after the ISS was finished.


Background


Space Shuttle

The Space Shuttle was a partially reusable spacecraft operated by the U.S.
National Aeronautics and Space Administration The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding th ...
(NASA). It flew in space for the first time in April 1981, and was used to conduct in-orbit research, and deploy commercial, military, and scientific payloads. At launch, it consisted of the orbiter, which contained the crew and payload, the external tank (ET), and the two solid rocket boosters (SRBs). The orbiter was a reusable, winged vehicle that launched vertically and landed as a glider. Five operational orbiters were built during the Space Shuttle program. was the first space-rated orbiter constructed, following atmospheric test vehicle . The orbiter contained the crew compartment, where the crew predominantly lived and worked throughout a mission. Three Space Shuttle main engines (SSMEs) were mounted at the aft end of the orbiter and provided thrust during launch. Once in space, the crew maneuvered using the two smaller, aft-mounted Orbital Maneuvering System (OMS) engines. The orbiter was protected from heat during reentry by the thermal protection system (TPS), a thermal soaking protective layer around the orbiter. In contrast with previous US spacecraft, which had used ablative heat shields, the reusability of the orbiter required a multi-use heat shield. During reentry, the TPS experienced temperatures up to , but had to keep the orbiter vehicle's aluminum skin temperature below . The TPS primarily consisted of four types of tiles. The nose cone and leading edges of the wings experienced temperatures above , and were protected by reinforced carbon-carbon tiles (RCC). Thicker RCC tiles were developed and installed in 1998 to prevent damage from micrometeoroid and orbital debris. The entire underside of the orbiter vehicle, as well as the other hottest surfaces, were protected with high-temperature reusable surface insulation. Areas on the upper parts of the orbiter vehicle were coated in a white low-temperature reusable surface insulation, which provided protection at temperatures below . The payload bay doors and parts of the upper wing surfaces were coated in reusable felt surface insulation, as the temperature there remained below . Two solid rocket boosters (SRBs) were connected to the ET, and burned for the first two minutes of flight. The SRBs separated from the ET once they had expended their fuel and fell into the Atlantic Ocean under a parachute. NASA retrieval teams recovered the SRBs and returned them to the Kennedy Space Center, where they were disassembled and their components were reused on future flights. When the Space Shuttle launched, the orbiter and SRBs were connected to the ET, which held the fuel for the SSMEs. The ET consisted of a tank for liquid hydrogen (LH2), stored at and a smaller tank for liquid oxygen (LOX), stored at . It was covered in insulative foam to keep the liquids cold and prevent ice forming on the tank's exterior. The orbiter connected to the ET via two umbilicals near its bottom and a bipod near its top section. After its fuel had been expended, the ET separated from the orbiter and reentered the atmosphere, where it would break apart during reentry and its pieces would land in the Indian or Pacific Ocean.


Debris strike concerns

During the design process of the Space Shuttle, a requirement of the ET was that it would not release any debris that could potentially damage the orbiter and its TPS. The integrity of the TPS components was necessary for the survival of the crew during reentry, and the tiles and panels were only built to withstand relatively minor impacts. On STS-1, the first flight of the Space Shuttle, the orbiter ''Columbia'' was damaged during its launch from a foam strike. Foam strikes occurred regularly during Space Shuttle launches; of the 79 missions with available imagery during launch, foam strikes occurred on 65 of them. The bipod connected the ET near the top to the front underside of the orbiter via two struts with a ramp at the tank end of each strut; the ramps were covered in foam to prevent ice from forming that could damage the orbiter. The foam on each bipod ramp was approximately , and was carved by hand from the original foam application. Bipod ramp foam from the left strut had been observed falling off the ET on six flights prior to STS-107, and had created some of the largest foam strikes that the orbiter experienced. The first bipod ramp foam strike occurred during STS-7; the orbiter's TPS was repaired after the mission but no changes were made to address the cause of the bipod foam loss. After bipod foam loss on STS-32, NASA engineers, under the assumption that the foam loss was due to pressure buildup within the insulation, added vent holes to the foam to allow gas to escape. After a bipod foam strike damaged the TPS on
STS-50 STS-50 (U.S. Microgravity Laboratory-1) was a NASA Space Shuttle mission, the 12th mission of the '' Columbia'' orbiter. ''Columbia'' landed at Kennedy Space Center for the first time ever due to bad weather at Edwards Air Force Base caused b ...
, internal NASA investigations concluded it was an "accepted flight risk" and that it should not be treated as a flight safety issue. Bipod foam loss occurred on
STS-52 STS-52 was a ''Space Transportation System'' ( NASA Space Shuttle) mission using Space Shuttle ''Columbia'', and was launched on October 22, 1992. Crew Backup crew Mission highlights Primary mission objectives were deployment of t ...
and STS-62, but neither event was noticed until the investigation following ''Columbias destruction. During STS-112, which flew in October 2002, a chunk of bipod ramp foam broke away from the ET bipod ramp and hit the SRB-ET attachment ring near the bottom of the left SRB, creating a dent wide and deep. Following the mission, the Program Requirements Control Board declined to categorize the bipod ramp foam loss as an in-flight anomaly. The foam loss was briefed at the STS-113 Flight Readiness Brief, but the Program Requirements Control Board decided that the ET was safe to fly. A debris strike from the
ablative material Ablation ( la, ablatio – removal) is removal or destruction of something from an object by vaporization, chipping, erosive processes or by other means. Examples of ablative materials are described below, and include spacecraft material for a ...
on the right SRB caused significant damage to during the
STS-27 STS-27 was the 27th NASA Space Shuttle mission, and the third flight of Space Shuttle ''Atlantis''. Launching on December 2, 1988, on a four-day mission, it was the second shuttle flight after the Space Shuttle ''Challenger'' disaster of Janu ...
launch on December2, 1988. On the second day of the flight, the crew inspected the damage using a camera on the remote manipulator system. The debris strike removed a tile; the exposed orbiter skin was a reinforced section, and a burn-through might have occurred had the damage been in a different location. After the mission, the NASA Program Requirements Control Board designated the issue as an in-flight anomaly that was corrected with the planned improvement for the SRB ablator.


Flight


Space Shuttle mission

For STS-107, ''Columbia'' carried the SpaceHab Research Double Module, the Orbital Acceleration Research Experiment, and an Extended Duration Orbiter pallet. The mission passed its pre-launch certifications and reviews, and began with the launch. The mission was originally scheduled to launch on January 11, 2001, but it was delayed 13times, until its launch on January 16, 2003. The seven-member crew of STS-107 were selected in July2000. The mission was commanded by Rick Husband, who was a colonel in the U.S. Air Force and a test pilot. He had previously flown on STS-96. The mission's pilot was
William McCool William Cameron "Willie" McCool (September 23, 1961 – February 1, 2003) (Cmdr, USN) was an American naval officer and aviator, test pilot, aeronautical engineer, and NASA astronaut, who was the pilot of Space Shuttle ''Columbia'' mission ST ...
, a U.S. Navy
commander Commander (commonly abbreviated as Cmdr.) is a common naval officer rank. Commander is also used as a rank or title in other formal organizations, including several police forces. In several countries this naval rank is termed frigate captain. ...
who was on his first spaceflight. The payload commander was Michael Anderson, a U.S. Air Force
lieutenant colonel Lieutenant colonel ( , ) is a rank of commissioned officers in the armies, most marine forces and some air forces of the world, above a major and below a colonel. Several police forces in the United States use the rank of lieutenant colone ...
who had previously flown on STS-89. Kalpana Chawla, served as the flight engineer; she had previously flown on STS-87. David Brown and Laurel Clark, both Navy captains, flew as the mission specialists on their first spaceflights. Ilan Ramon, a colonel in the Israeli Air Force and the first Israeli
astronaut An astronaut (from the Ancient Greek (), meaning 'star', and (), meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally r ...
, flew as a payload specialist.


Launch and debris strike

''Columbia'' launched from the Kennedy Space Center Launch Complex 39A (LC-39A) at 10:39:00a.m. At T+81.7seconds, a piece of foam approximately long and wide broke off from the left bipod on the ET. At T+81.9seconds, the foam struck the reinforced carbon-carbon (RCC) panels on ''Columbia''s left wing at relative velocity of . The foam's low ballistic coefficient caused it to lose speed immediately after separating from the ET, and the orbiter ran into the slower foam. The mission or ground crew did not notice the debris strike at the time. The SRBs separated from the ET at T+2minutes and 7seconds, followed by the ET separating from the orbiter at T+8minutes 30seconds. The ET separation was photographed by Anderson and recorded by Brown, but they did not record the bipod with missing foam. At T+43minutes, ''Columbia'' completed its orbital insertion as planned.


Flight risk management

After ''Columbia'' entered orbit, the NASA Intercenter Photo Working Group conducted a routine review of videos of the launch. The group's analysts did not notice the debris strike until the second day of the mission. None of the cameras recording the launch had a clear view of the debris striking the wing, resulting in the group being unable to determine the level of damage sustained by the orbiter. The group's chair contacted
Wayne Hale N. Wayne Hale Jr. (born July 5, 1954) is a former NASA engineer. Previously a flight director and Space Shuttle program manager, Hale served as NASA's Deputy Associate Administrator for Strategic Partnerships prior to his retirement on July 31, ...
, the Shuttle Program Manager for Launch Integration, to request on-orbit imagery of ''Columbia''s wing to assess its damage. After receiving notification of the debris strike, engineers at NASA, United Space Alliance, and Boeing created the Debris Assessment Team and began working to determine the damage to the orbiter. Intercenter Photo Working Group believed that the orbiter's RCC tiles were possibly damaged; NASA program managers were less concerned over the danger caused by the debris strike. Boeing analysts attempted to model the damage caused to the orbiter's TPS from the foam strike. The software models predicted damage that was deeper than the thickness of the TPS tiles, indicating that the orbiter's aluminum skin would be unprotected in that area. The Debris Assessment Team dismissed this conclusion as inaccurate, due to previous instances of predictions of damage greater than the actual damage. Further modeling specific to the RCC panels used software calibrated to predict damage caused by falling ice. The software predicted only one of 15 scenarios that ice would cause damage, leading the Debris Assessment Team to conclude there was minimal damage due to the lower density of foam to ice. To assess the possible damage to ''Columbia''s wing, members of the Debris Assessment Team made multiple requests to get imagery of the orbiter from the Department of Defense (DoD). Imagery requests were channeled through both the DoD Manned Space Flight Support Office and the
Johnson Space Center The Lyndon B. Johnson Space Center (JSC) is NASA's center for human spaceflight (originally named the Manned Spacecraft Center), where human spaceflight training, research, and flight control are conducted. It was renamed in honor of the late U ...
Engineering Directorate. Hale coordinated the request through a DoD representative at KSC. The request was relayed to the
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(USSTRATCOM), which began identifying imaging assets that could observe the orbiter. The imagery request was soon rescinded by NASA Mission Management Team Chair
Linda Ham Linda Ham (née Hautzinger) is a former Constellation Program Transition and Technology Infusion Manager at NASA. She was formerly the program integration manager in the National Aeronautics and Space Administration (NASA) Space Shuttle Program ...
after she investigated the origin of it. She had consulted with a Flight Director Phil Engelauf and members of the Mission Management Team, who stated that they did not have a requirement for imagery of ''Columbia''. Ham did not consult with the Debris Assessment Team, and cancelled the imagery request on the basis that it had not been made through official channels. Maneuvering the orbiter to allow its left wing to be imaged would have interrupted ongoing science operations, and Ham dismissed the DoD imaging capabilities as insufficient to assess damage to the orbiter. Following the rejection of their imagery request, the Debris Assessment Team did not make further requests for the orbiter to be imaged. Through the flight, members of the Mission Management Team were less concerned than the Debris Assessment Team about the potential risk of a debris strike. The loss of bipod foam on STS-107 was compared to previous foam strike events, none of which caused the loss of an orbiter or crew. Ham, scheduled to work as an integration manager for
STS-114 STS-114 was the first "Return to Flight" Space Shuttle mission following the Space Shuttle Columbia disaster, Space Shuttle ''Columbia'' disaster. Space Shuttle Discovery, ''Discovery'' launched at 10:39 Eastern Time Zone, EDT (14:39 Coordinated ...
, was concerned with the potential delays from a foam loss event. Mission management also downplayed the risk of the debris strike in communications with the crew. On January 23, flight director Steve Stich sent an e-mail to Husband and McCool to tell them about the foam strike and inform them there was no cause for concern about damage to the TPS, as foam strikes had occurred on previous flights. The crew were also sent a 15-second video of the debris strike in preparation for a press conference, but were reassured that there were no safety concerns. On January26, the Debris Assessment Team concluded that there were no safety concerns from the debris strike. The team's report was critical of the Mission Management Team for asserting that there were no safety concerns before the Debris Assessment Team's investigation had been completed. On January29, William Readdy, the Associate Administrator for Space Flight, agreed to DoD imaging of the orbiter, but on the condition that it would not interfere with flight operations; ultimately, the orbiter was not imaged by the DoD during the flight. At a Mission Management Team on January31, the day before ''Columbia'' reentered the atmosphere, the Launch Integration Office voiced Ham's intention to review on-board footage to view the missing foam, but concerns of crew safety were not discussed.


Reentry

''Columbia'' was scheduled to reenter the atmosphere and land on February 1, 2003. At 03:30am EST, the Entry Flight Control Team started its shift at the Mission Control Center. On board the orbiter, the crew stowed loose items and prepared their equipment for reentry. At 45minutes before the deorbit burn, Husband and McCool began working through the entry checklist. At 08:10am, the Capsule Communicator (CAPCOM) informed the crew that they were approved to conduct the deorbit burn. At 8:15:30am, the crew successfully executed the deorbit burn, which lasted for 2minutes and 38seconds. At 8:44:09am, ''Columbia'' reentered the atmosphere at an altitude of , a point named entry interface. The damage to the TPS on the orbiter's left wing allowed for hot air to enter and begin melting the aluminum structure. Four and a half minutes after entry interface, a sensor began recording greater-than-normal amounts of strain on the left wing; the sensor's data was recorded to internal storage and not transmitted to the crew or ground controllers. The orbiter began to turn ( yaw) to the left as a result of the increased drag on the left wing, but this was not noticed by the crew or mission control because of corrections from the orbiter's flight control system. This was followed by sensors in the left wheel well reporting a rise in temperature. At 8:53:46am, ''Columbia'' crossed over the California coast; it was traveling at Mach23 at an altitude of , and the temperature of its wings' leading edges was estimated to be . Soon after it entered California airspace, the orbiter shed several pieces of debris, events observed on the ground as sudden increases in brightness of the air around the orbiter. The MMACS officer reported that the hydraulic sensors in the left wing had readings below the sensors' minimum detection thresholds at 8:54:24am. ''Columbia'' continued its reentry and traveled over Utah, Arizona, New Mexico, and Texas, where observers would report seeing signs of debris being shed. At 8:58:03am, the orbiter's aileron trim changed from the predicted values because of the increasing drag caused by the damage to the left wing. At 8:58:21am, the orbiter shed a TPS tile that would later land in Littlefield, Texas; it would become the westernmost piece of recovered debris. The crew first received an indication of a problem at 8:58:39am when the Backup Flight Software monitor began displaying fault messages for a loss of pressure in the tires of the left landing gear. The pilot and commander then received indications that the status of the left landing gear was unknown, as different sensors reported the gear was down and locked or in the stowed position. The drag of the left wing continued to yaw the orbiter to the left until it could no longer be corrected using aileron trim. The orbiter's Reaction Control System (RCS) thrusters began firing continuously to correct its orientation. The loss of signal (LOS) from ''Columbia'' occurred at 8:59:32am. Mission control stopped receiving information from the orbiter at this time, and Husband's last radio call of "Roger, uh..." was cut off mid-transmission. One of the channels in the flight control software was bypassed as the result of a failed wire, and a Master Alarm began sounding on the flight deck. Loss of control of the orbiter is estimated to have begun several seconds later with a loss of hydraulic pressure and an uncontrolled pitch-up maneuver. The orbiter began flying along a ballistic trajectory, which was significantly steeper and had more drag than the previous gliding trajectory. The orbiter, while still traveling faster than Mach15, entered into a flat spin of 30° to 40° per second. The acceleration that the crew was experiencing increased from approximately 0.8 g to 3 g, which would have likely caused dizziness and disorientation, but not incapacitation. The autopilot was switched to manual control and reset to automatic mode at 9:00:03am; this would have required the input of either Husband or McCool, indicating that they were still conscious and able to perform functions at the time. All hydraulic pressure was lost, and McCool's final switch configurations indicate that he had tried to restore the hydraulic systems at some time after 9:00:05am. At 9:00:18am, the orbiter began a catastrophic breakup, and all on-board data recording soon ceased. Ground observers noted a sudden increase in debris being shed, and all on-board systems lost power. By 9:00:25am, the orbiter's fore and aft sections had separated from one another. The sudden jerk caused the crew compartment to collide with the interior wall of the fuselage, resulting in a depressurization of the crew compartment by 9:00:35am. The pieces of the orbiter continued to break apart into smaller pieces, and within a minute after breakup were too small to be detected from ground-based videos. By 9:35am, all debris and crew remains were estimated to have impacted the ground. The loss of signal occurred at a time when the Flight Control Team expected brief communication outages as the orbiter stopped communication via the west tracking and data relay satellite (TDRS). Personnel in Mission Control were unaware of the in-flight break up, and continued to try and reestablish contact with the orbiter. At approximately 9:12am, when ''Columbia'' would be conducting its final maneuvers to land, a Mission Control member received a phone call that discussed news coverage of the orbiter breaking up. This information was passed onto the Entry Flight Director, LeRoy Cain, who initiated contingency procedures. At KSC, where ''Columbia'' was expected to land at 9:16a.m., NASA Associate Administrator and former astronaut
William Readdy William Francis Readdy is a former Associate Administrator of the Office of Space Flight, at NASA Headquarters. He was born January 24, 1952, in Quonset Point, Rhode Island, and is married to Colleen Nevius. They have two sons and a daughter. ...
also began contingency procedures after the orbiter did not land as scheduled.


Crew survivability

During reentry, all seven of the STS-107 crew members were killed, but the exact time of their deaths could not be determined. The level of acceleration they experienced during crew module breakup was not lethal. The first lethal event the crew experienced was the
depressurization Uncontrolled decompression is an unplanned drop in the pressure of a sealed system, such as an aircraft cabin or hyperbaric chamber, and typically results from human reliability, human error, fatigue (material), material fatigue, engineering failur ...
of the crew module. The rate and exact time of depressurization could not be determined, but occurred no later than 9:00:59am. The remains of the crew members indicated they all experienced depressurization. The astronauts' helmets have a visor that, when closed, can temporarily protect the crew member from depressurization. Some of the crew members had not closed their visor, and one was not wearing a helmet, indicating that depressurization occurred quickly before they could take protective measures. During and after the breakup of the crew module, the crew, either unconscious or dead, experienced rotation on all three axes. The astronauts' shoulder harnesses were unable to prevent trauma to their upper bodies, as the inertia reel system failed to retract sufficiently to secure them, leaving them only restrained by their lap belts. The helmets were not conformal to the crew members' heads, allowing for head injuries inside of the helmet. The neck ring of the helmet may have also acted as a fulcrum that caused spine and neck injuries. The physical trauma to the astronauts, who could not brace to prevent such injuries, could have also resulted in their deaths. The astronauts also likely suffered from significant thermal trauma. Hot gas entered the disintegrating crew module, burning the crew members, whose bodies were still somewhat protected by their ACES suits. Once the crew module fell apart, the astronauts were violently exposed to windblast and a possible shock wave, which stripped their suits from their bodies. The crews' remains were exposed to hot gas and molten metal as they fell away from the orbiter. After separation from the crew module, the bodies of the crew members entered an environment with almost no oxygen, very low atmospheric pressure, and both high temperatures caused by deceleration, and extremely low ambient temperatures. Ultimately, their bodies impacted the ground with lethal levels of force.


Presidential response

At 14:04 EST (19:04 UTC), President George W. Bush said in a televised address to the nation, "My fellow Americans, this day has brought terrible news, and great sadness to our country. At 9 o'clock this morning, Mission Control in Houston lost contact with our Space Shuttle ''Columbia''. A short time later, debris was seen falling from the skies above Texas. The ''Columbia'' is lost; there are no survivors."


Recovery of debris

After the orbiter broke up, reports came in to eastern Texas law enforcement offices of an explosion and falling debris. Astronauts
Mark Kelly Mark Edward Kelly (born February 21, 1964) is an American politician, former astronaut, and United States Navy captain who has served as the junior United States senator from Arizona since 2020. A member of the Democratic Party, he was electe ...
and Gregory Johnson traveled on a US Coast Guard helicopter from Houston to Nacogdoches, and Jim Wetherbee drove a team of astronauts to
Lufkin Lufkin is the largest city in Angelina County, Texas and the county seat. The city is situated in Deep East Texas and about 60 miles west of the Texas-Louisiana border. Its estimated population is 35,021 as of July 1, 2019. Lufkin was founded ...
to assist with recovery efforts. Debris was reported from east Texas through southern Louisiana. Recovery crews and local volunteers worked to locate and identify debris. On the first day of the disaster, searchers began finding remains of the astronauts.. Within three days of the crash, some remains from every crew member had been recovered. These recoveries occurred along a line south of Hemphill, Texas, and west of the Toledo Bend Reservoir. The final body of a crew member was recovered on February 11. The crew remains were transported to the Armed Forces Institute of Pathology at Dover Air Force Base. Immediately after the disaster, the
Texas Army National Guard The Texas Army National Guard is a component of the United States Army, the United States National Guard and the Texas Military Forces (along with the Texas Air National Guard and the Texas State Guard). Texas Army National Guard units are train ...
deployed 300 members to assist with security and recovery, and the Coast Guard Gulf Strike Team was assigned to help recover hazardous debris. Over the following days, the search grew to include hundreds of individuals from the
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,
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, and Texas and Louisiana public safety organizations, as well as local volunteers. In the months after the disaster, the largest-ever organized ground search took place. NASA officials warned of the dangers of handling debris, as it could have been contaminated by propellants. Soon after the accident, some individuals attempted to sell ''Columbia'' debris on the internet, including on the online auction website eBay. Officials at NASA were critical of these efforts, as the debris was NASA property and was needed for the investigation. A three-day amnesty period was offered for recovered orbiter debris. During this time, about 20 individuals contacted NASA to return debris, which included debris from the ''Challenger'' disaster. After the end of the amnesty period, several individuals were arrested for illegal looting and possession of debris. ''Columbia''s flight data recorder was found near Hemphill, Texas, southeast of Nacogdoches, on March 19, 2003. ''Columbia'' was the first orbiter, and it had a unique flight data OEX (Orbiter EXperiments) recorder to record vehicle performance data during the test flights. The recorder was left in ''Columbia'' after the initial Shuttle test-flights were completed, and began recording information 15 minutes prior to reentry. The tape it recorded to was broken at the time of the crash, but information from the orbiter's sensors could have been recorded beforehand. Several days later, the tape was sent to the Imation Corporation for it to be inspected and cleaned. On March 25, the OEX's tape was sent to KSC, where it was copied and analyzed. On March27, a Bell 407 helicopter that was being used in the debris search crashed due to mechanical failure in the Angelina National Forest. The crash killed the pilot, Jules F. Mier Jr., and a Texas Forest Service aviation specialist, Charles Krenek, and injured three other crew members. A group of ''
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'' worms, enclosed in aluminum canisters, survived reentry and impact with the ground and were recovered weeks after the disaster. The culture, which was part of an experiment to research their growth while consuming synthetic nutrients, was found to be alive on April 28, 2003. NASA management selected the Reusable Launch Vehicle hangar at KSC to reconstruct recovered ''Columbia'' debris. NASA Launch Director
Michael Leinbach Michael D. Leinbach (born c. 1953) was the Shuttle Launch Director at NASA's John F. Kennedy Space Center (KSC), Florida. He was responsible for activities in the overall shuttle launch countdown, including planning, policy, and execution. Ear ...
led the reconstruction team, which was staffed by ''Columbia'' engineers and technicians. Debris was laid out on the floor of the hangar in the shape of the orbiter to allow investigators to look for patterns in the damage that indicated the cause of the disaster. Astronaut Pamela Melroy was assigned to oversee the six-person team reconstructing the crew compartment, which included fellow astronaut Marsha Ivins. Recovered debris was shipped from the field to KSC, where it was unloaded and checked to see if it was contaminated by toxic
hypergolic propellant A hypergolic propellant is a rocket propellant combination used in a rocket engine, whose components spontaneously ignite when they come into contact with each other. The two propellant components usually consist of a fuel and an oxidizer. Th ...
s. Each piece of debris had an identifying number and a tag indicating the coordinates where it was found. Staff attached photographed and cataloged each piece of debris. Recovered debris from inside the orbiter was placed in a separate area, as it was not considered to be a contributor to the accident. NASA conducted a fault tree analysis to determine the probable causes of the accident, and focused its investigations on the parts of the orbiter most likely to have been responsible for the in-flight breakup. Engineers in the hangar analyzed the debris to determine how the orbiter came apart. Even though the crew compartment was not considered as a likely cause of the accident, Melroy successfully argued for its analysis to learn more about how its safety systems helped, or failed to help, the crew survive. The tiles on the left wing were studied to determine the nature of the burning and melting that occurred. The damage to the debris indicated that the breach began at the wing's leading edge, allowing hot gas to get past the orbiter's thermal protection system. The search for ''Columbia'' debris ended in May. Approximately 83,900 pieces of debris were recovered, weighing , which was about 38% of the orbiter's overall weight. About 40,000 recovered pieces of debris have never been identified. All recovered non-human ''Columbia'' debris was stored in unused office space at the Vehicle Assembly Building, except for parts of the crew compartment, which were kept separate. In July 2011, lower water levels caused by a drought revealed a piece of debris in a lake. NASA identified the piece as a power reactant storage and distribution tank.


''Columbia'' Accident Investigation Board

Approximately 90 minutes after the disaster, NASA Administrator Sean O'Keefe called to convene the ''Columbia'' Accident Investigation Board (CAIB) to determine the cause of the disaster. It was chaired by retired U.S. Navy Admiral Harold W. Gehman, Jr. and included military and civilian analysts. It initially consisted of eight members, including Gehman, but expanded to 13 members by March. The CAIB members were notified by noon on the day of the accident, and participated in a teleconference that evening. The following day, they traveled to Barksdale AFB to begin the investigation. The CAIB members first toured the debris fields, and then established their operations at JSC. The CAIB established four teams to investigate NASA management and program safety, NASA training and crew operations, the technical aspects of the disaster, and how NASA culture affected the Space Shuttle program. These groups collaborated, and hired other support staff to investigate. The CAIB worked alongside the reconstruction efforts to determine the cause of the accident, and interviewed members of the Space Shuttle program, including those who had been involved with STS-107. The CAIB conducted public hearings from March until June, and released its final report in August2003.


Cause of the accident

After looking at sensor data, the CAIB considered damage to the left wing as a likely culprit for ''Columbia''s destruction. It investigated that recovered debris and noted the difference in heat damage between the two wings. RCC panels from the left wing were found in the western portion of the debris field, indicating that it was shed first before the rest of the orbiter disintegrated. X-ray and chemical analysis was conducted on the RCC panels, revealing the highest levels of slag deposits to be in the left wing tiles. Impact testing was conducted at the
Southwest Research Institute Southwest Research Institute (SwRI), headquartered in San Antonio, Texas, is an independent and nonprofit applied research and development (R&D) organization. Founded in 1947 by oil businessman Tom Slick, it provides contract research and develop ...
, using a nitrogen-powered gun to fire a projectile made of the same material as the ET bipod foam. Panels taken from ''Enterprise'', , and ''Atlantis'' were used to determine the projectiles' effect on RCC tiles. A test on RCC panel 8, taken from ''Atlantis'', was the most consistent with the damage observed on ''Columbia'', indicating it was the damaged panel that led to the in-flight breakup.


NASA culture

The CAIB was critical of NASA organizational culture, and compared its current state to that of NASA leading up to the ''Challenger'' disaster. It concluded that NASA was experiencing budget constraints while still expecting to keep a high level of launches and operations. Program operating costs were lowered by 21% from 1991 to 1994, despite a planned increase in the yearly flight rate for assembly of the International Space Station. Despite a history of foam strike events, NASA management did not consider the potential risk to the astronauts as a safety-of-flight issue. The CAIB found that a lack of a safety program led to the lack of concern over foam strikes. The board determined that NASA lacked the appropriate communication and integration channels to allow problems to be discussed and effectively routed and addressed. This risk was further compounded by pressure to adhere to a launch schedule to enable to the construction of the ISS.


Possible emergency procedures

In its report, the CAIB discussed potential options that could have saved ''Columbia''s crew. They determined that the mission could have originally been extended for up to 30 days, after which the lithium hydroxide canisters that were used to remove carbon dioxide would have run out. On STS-107, ''Columbia'' was carrying the Extended Duration Orbiter, which increased its supply of oxygen and hydrogen. To maximize the mission duration, non-essential systems would have been powered down, and animals in the Spacehab module would have been euthanized. When STS-107 launched, ''Atlantis'' was undergoing preparation for the STS-114 launch on March1, 2003. Had NASA management decided to launch a rescue mission, an expedited process could have begun to launch it as a rescue vehicle. Some pre-launch tests would have been eliminated to allow it to launch on time. ''Atlantis'' would have launched with additional equipment for EVAs, and launched with a minimum required crew. It would have rendezvoused with ''Columbia'', and the STS-107 crew would have conducted EVAs to transfer to ''Atlantis''. ''Columbia'' would have been remotely deorbited; as Mission Control would have been unable to remotely land it, it would have been disposed of in the Pacific Ocean. The CAIB also investigated the possibility of on-orbit repair of the left wing. Although there were no materials or adhesives onboard ''Columbia'' that could have survived reentry, the board researched the effectiveness of stuffing materials from the orbiter, crew cabin, or water into the RCC hole. They determined that the best option would have been to harvest tiles from other places on the orbiter, shaping them, and then stuffing them into the RCC hole. Given the difficulty of on-orbit repair, risk of further damaging the RCC tiles, the CAIB determined that the likelihood of a successful on-orbit repair would have been low.


NASA response


Space Shuttle updates

The Space Shuttle program was suspended after the loss of ''Columbia''. The further construction of the International Space Station (ISS) was delayed, as the Space Shuttle had been scheduled for seven missions to the ISS in 2003 and 2004 to complete its construction. To prevent future foam strikes, the ET was redesigned to remove foam from the bipod. Instead, electric heaters were installed to prevent ice building up in the bipod due to the cold liquid oxygen in its feedlines. Additional heaters were also installed along the liquid oxygen line, which ran from the base of the tank to its interstage section. NASA also improved its ground imaging capabilities at Kennedy Space Center to better observe and monitor potential issues that occur during launch. The existing cameras at LC-39A, LC-39B, and along the coast were upgraded, and nine new camera sites were added. The camera on the belly of the orbiter was changed from a film camera to a digital camera to allow images of the ET to be viewed on the ground soon after launch. The Orbiter Boom Sensor System, a camera on the end of the Canadarm, was added to allow the crew to inspect the orbiter for any tile damage once they reached orbit. Each of the orbiter's wings were equipped with 22 temperature sensors to detect any breaches during reentry and with 66 accelerometers to detect an impact. Post-landing inspection procedures were updated to include technicians examining the RCC panels using flash thermography. As well as the updates to the orbiter, NASA prepared contingency plans in the event that a mission would be unable to safely land. The plan involved the stranded mission docking with the ISS, on which the crew would inspect and attempt to repair the damaged orbiter. If they were unsuccessful, they would remain aboard the ISS and wait for a rescue. The rescue mission, designated
STS-3xx Space Shuttle missions designated STS-3xx (officially called Launch On Need (LON) missions) were rescue missions which would have been mounted to rescue the crew of a Space Shuttle if their vehicle was damaged and deemed unable to make a success ...
, would be activated, and would use the next-in-line hardware for the orbiter, ET, and SRBs. The expected time to launch would be 35 days, as that was the requirement to prepare launch facilities. Before the arrival of the rescue mission, the stranded crew would power up the damaged orbiter, which would be remotely controlled as it was undocked and deorbited, and its debris would land in the Pacific Ocean. The minimal crew would launch, dock with the ISS, where it would spend a day transferring astronauts and equipment before undocking and landing.


First Return to Flight mission (STS-114)

The first Return to Flight mission, STS-114, began with the launch of ''Discovery'' on July 26, 2005, at 10:39 a.m (EDT). Sixteen pieces of foam from the ET were dislodged during the launch that were large enough to be considered significant by NASA investigators, including one piece that was approximately . Post-launch investigations did not find any indications of damage from the foam loss, but ET video did reveal that a small piece of TPS tile from the nose landing gear fell off during launch. Upon reaching orbit, the crew inspected ''Discovery'' with the Orbiter Boom Sensor System. On July 29, ''Discovery'' rendezvoused with the ISS and, before docking, performed the first rendezvous pitch maneuver to allow the crew aboard the ISS to observe and photograph the orbiter's belly. The next day, astronauts Soichi Noguchi and Stephen Robinson performed the first of three spacewalks. They tested a tile repair tool, the Emittance Wash Applicator, on intentionally damaged TPS tiles that had been brought in the payload bay. On August 3, the same astronauts performed the third EVA of the mission, during which Robinson stood on the ISS's
Canadarm2 The Mobile Servicing System (MSS), is a robotic system on board the International Space Station (ISS). Launched to the ISS in 2001, it plays a key role in station assembly and maintenance; it moves equipment and supplies around the station, supp ...
and went to ''Discovery''s belly to remove two gap fillers between tiles that had begun to protrude. After a delay due to bad weather at KSC, the decision was made to land at Edwards AFB. ''Discovery'' successfully landed at 8:11 a.m. (EDT) on August 9. In the event that ''Discovery'' unable to safely land, the crew would have remained on the ISS until ''Atlantis'' was flown to rescue them. As a result of the foam loss, NASA grounded the Space Shuttle fleet again.


Second Return to Flight mission (STS-121)

To address the problem of foam loss for the second Return to Flight mission ( STS-121), NASA engineers removed the foam ramp from the protuberance air load (PAL) on the ET, which was the source of the largest piece of debris on STS-114. The launch was postponed from its scheduled launch of July1, 2006 and again on July2 due to inclement weather at KSC. On July3, a piece of foam approximately and weighing broke off from the ET. The mission still launched as scheduled at 2:38 p.m. (EDT) on July4. After reaching orbit, ''Discovery'' performed post-launch inspections of its TPS and docked with the ISS on July6. The orbiter carried a remote control orbiter in-flight maintenance cable that could connect the flight deck systems to the avionics system in the mid-deck; it would allow the spacecraft to be landed remotely, to include controlling the landing gear and deploying the
parachute A parachute is a device used to slow the motion of an object through an atmosphere by creating drag or, in a ram-air parachute, aerodynamic lift. A major application is to support people, for recreation or as a safety device for aviators, who ...
. On July 12, astronauts Piers Sellers and Michael Fossum performed an EVA to test the NonOxide Adhesive eXperiment (NOAX), which applied protective sealant to samples of damaged TPS tiles. ''Discovery'' undocked from the ISS on July14 and safely landed at 9:14 a.m. on July17 at KSC. Had the crew been stranded in orbit, NASA planned to launch ''Atlantis'' to rescue them from the ISS.


Program cancellation

In January 2004, President Bush announced the Vision for Space Exploration, calling for the Space Shuttle fleet to complete the ISS and be retired by 2010, to be replaced by a newly developed Crew Exploration Vehicle for travel to the Moon and Mars. In 2004, NASA Administrator Sean O'Keefe canceled a planned servicing of the Hubble Space Telescope and decided that future missions would all rendezvous with the ISS to ensure the safety of the crew. In 2006, his successor, Michael Griffin, decided to have one more servicing mission to the telescope, STS-125, which flew in May 2009. The retirement of the Space Shuttle was delayed until 2011, after which no further crewed spacecraft were launched from the United States until 2020 when
SpaceX Space Exploration Technologies Corp. (SpaceX) is an American spacecraft manufacturer, launcher, and a satellite communications corporation headquartered in Hawthorne, California. It was founded in 2002 by Elon Musk with the stated goal of ...
's Crew Dragon Demo-2 mission successfully carried NASA astronauts Doug Hurley and
Robert Behnken Robert Louis Behnken (; born July 28, 1970, in St. Ann, Missouri) is a NASA astronaut, engineer, and former Chief of the Astronaut Office. Behnken holds a Ph.D in mechanical engineering and the rank of colonel in the U.S. Air Force, where he se ...
to the ISS.


Legacy

On February 4, 2003, President Bush and his wife
Laura Laura may refer to: People * Laura (given name) * Laura, the British code name for the World War I Belgian spy Marthe Cnockaert Places Australia * Laura, Queensland, a town on the Cape York Peninsula * Laura, South Australia * Laura Bay, a bay on ...
led a memorial service for the astronauts' families at the
Lyndon B. Johnson Space Center The Lyndon B. Johnson Space Center (JSC) is NASA's center for human spaceflight (originally named the Manned Spacecraft Center), where human spaceflight training, research, and flight control are conducted. It was renamed in honor of the late U ...
. Two days later, Vice President
Dick Cheney Richard Bruce Cheney ( ; born January 30, 1941) is an American politician and businessman who served as the 46th vice president of the United States from 2001 to 2009 under President George W. Bush. He is currently the oldest living former U ...
and his wife Lynne led a similar service at Washington National Cathedral.
Patti LaBelle Patricia Louise Holte (born May 24, 1944), known professionally as Patti LaBelle, is an American R&B singer, actress and businesswoman. LaBelle is referred to as the " Godmother of Soul". She began her career in the early 1960s as lead singe ...
sang "Way Up There" as part of the service. A memorial service was held at KSC on February 7; Robert Crippen, the first pilot of ''Columbia'', gave a eulogy. On October 28, 2003, the names of the astronauts were added to the Space Mirror Memorial at the KSC Visitor Complex in Merritt Island, Florida, alongside the names of 17 other astronauts and cosmonauts. On February 2, 2004, NASA Administrator O'Keefe unveiled a memorial for the STS-107 crew at Arlington National Cemetery, and it is located near the ''Challenger'' memorial. A tree for each astronaut was planted in NASA's Astronaut Memorial Grove at the Johnson Space Center, along with trees for each astronaut from the Apollo 1 and ''Challenger'' disasters. The exhibit ''Forever Remembered'' at KSC Visitor Complex features the cockpit window frames from ''Columbia''. In 2004, Bush conferred posthumous Congressional Space Medals of Honor to all 14 crew members killed in the ''Challenger'' and ''Columbia'' accidents. NASA named several places in honor of ''Columbia'' and the crew. Seven
asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...
s discovered in July 2001 were named after astronauts:
51823 Rickhusband 51823 Rickhusband, provisional designation , is a dark Lixiaohua asteroid from the outer regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 18 July 2001, by astronomers of the Near-Earth Asteroid Tracking a ...
,
51824 Mikeanderson 51824 Mikeanderson (provisional designation ) is an Eoan asteroid in the outer region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 19 July 2001, by astronomers of the Near-Earth Asteroid Tracking program at ...
,
51825 Davidbrown 51825 Davidbrown (provisional designation ) is an Eoan asteroid in the outer region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 19 July 2001, by astronomers of the Near-Earth Asteroid Tracking program at Pal ...
, 51826 Kalpanachawla,
51827 Laurelclark 51827 Laurelclark (provisional designation ) is a background asteroid from the outer regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 20 July 2001, by astronomers of the Near-Earth Asteroid Tracking progr ...
,
51828 Ilanramon 51828 Ilanramon (provisional designation ) is a Gefionian asteroid from the central regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 20 July 2001, by astronomers of the Near-Earth Asteroid Tracking pr ...
,
51829 Williemccool 51829 Williemccool (provisional designation ) is a Vestian asteroid from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 21 July 2001, by astronomers of the Near-Earth Asteroid Tracking progra ...
. On Mars, the landing site of the rover '' Spirit'' was named ''Columbia'' Memorial Station, and included a memorial plaque to the ''Columbia'' crew mounted on the back of the high gain antenna. A complex of seven hills east of the ''Spirit'' landing site was dubbed the Columbia Hills; each of the seven hills was individually named for a member of the crew, and the rover explored the summit of
Husband Hill Husband Hill is one of the Columbia Hills in Gusev crater, Mars, which are close to the landing site of NASA's ''Spirit'' rover. It was named in honor of Rick Husband, the commander of the Space Shuttle ''Columbia'' when it disintegrated upon ...
in 2005. In 2006, the IAU approved naming seven lunar craters after the astronauts. In February 2006, NASA's National Scientific Balloon Facility was renamed the Columbia Scientific Balloon Facility. A
supercomputer A supercomputer is a computer with a high level of performance as compared to a general-purpose computer. The performance of a supercomputer is commonly measured in floating-point operations per second ( FLOPS) instead of million instructions ...
built in 2004 at the NASA Advanced Supercomputing Division was named "
Columbia Columbia may refer to: * Columbia (personification), the historical female national personification of the United States, and a poetic name for America Places North America Natural features * Columbia Plateau, a geologic and geographic region in ...
". The first part of the system, named " Kalpana", was dedicated to Chawla, who had worked at the Ames Research Center before joining the Space Shuttle program. The first dedicated meteorological satellite launched by the
Indian Space Research Organisation The Indian Space Research Organisation (ISRO; ) is the national space agency of India, headquartered in Bengaluru. It operates under the Department of Space (DOS) which is directly overseen by the Prime Minister of India, while the Chairman ...
(ISRO), Metsat-1, was renamed to
Kalpana-1 Kalpana-1 was the first dedicated meteorological satellite launched by Indian Space Research Organisation using Polar Satellite Launch Vehicle on 12 September 2002. The satellite is three-axis stabilized and is powered by solar panels, getting u ...
on February 5, 2003, after Chawla. In 2003, the airport in Amarillo, Texas, where Husband was from, was renamed to the Rick Husband Amarillo International Airport. A mountain peak in the Sangre de Cristo Range in the
Colorado Rockies The Colorado Rockies are an American professional baseball team based in Denver. The Rockies compete in Major League Baseball (MLB) as a member club of the National League (NL) West division. The team plays its home baseball games at Coors Fie ...
was renamed
Columbia Point Columbia Point is a high mountain summit of the Crestones in the Sangre de Cristo Range of the Rocky Mountains of North America. The thirteener is located east by south ( bearing 102°) of the Town of Crestone in Saguache County, Colorad ...
in 2003. In October 2004, both houses of Congress passed a resolution to change the name of
Downey, California Downey is a city located in Southeast Los Angeles County, California, United States, southeast of downtown Los Angeles. It is considered part of the Gateway Cities. The city is the birthplace of the Apollo space program. It is also the home of ...
's Space Science Learning Center to the
Columbia Memorial Space Center The Columbia Memorial Space Center (CMSC) is a science museum in the Los Angeles area, at 12400 Columbia Way, City of Downey, California, US. It is owned and operated by Downey, and open to the general public as a hands-on space museum and activi ...
, which is located at the former manufacturing site of the Space Shuttle orbiters. On April 1, 2003, the
Opening Day Opening Day is the day on which professional baseball leagues begin their regular season. For Major League Baseball (MLB) and most of the American minor leagues, this day typically falls during the first week of April, although in recent years ...
of baseball season, the
Houston Astros The Houston Astros are an American professional baseball team based in Houston, Texas. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) West division, having moved to the division in 2013 after ...
honored the ''Columbia'' crew by having seven simultaneous first pitches thrown by family and friends of the crew. For the National Anthem, 107 NASA personnel carried a U.S. flag onto the field. The Astros wore the mission patch on their sleeves the entire season. On February 1, 2004, the first anniversary of the ''Columbia'' disaster,
Super Bowl XXXVIII Super Bowl XXXVIII was an American football game between the National Football Conference (NFC) champion Carolina Panthers and the American Football Conference (AFC) champion New England Patriots to decide the National Football League (NFL) c ...
held in Houston's Reliant Stadium began with a pregame tribute to the crew of the ''Columbia'' by singer Josh Groban performing " You Raise Me Up", with the crew of STS-114 in attendance. In 2004, two space journalists, Michael Cabbage and William Harwood, released their book, ''Comm Check: The Final Flight of Shuttle Columbia''. It discusses the history of the Space Shuttle program, and documents the post-disaster recovery and investigation efforts. Michael Leinbach, a retired Launch Director at KSC who was working on the day of the disaster, released ''Bringing Columbia Home: The Untold Story of a Lost Space Shuttle and Her Crew'' in 2018. It documents his personal experience during the disaster, and the debris and remains recovery efforts. In 2004, the documentary '' Columbia: The Tragic Loss'' was released; it told of the life of Ilan Ramon and focused on the issues in NASA management that led to the disaster. PBS released a
Nova A nova (plural novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", which is Latin for "new") that slowly fades over weeks or months. Causes of the dramati ...
documentary, ''Space Shuttle Disaster'', in 2008. It featured commentary from NASA officials and space experts, and discussed historical issues with the spacecraft and NASA. The Scottish Celtic-Rock band Runrig included a song titled "Somewhere" on their album '' The Story'' that ends with a recording of a radio communication from Laurel Clark. Clark, who had become a fan of the band when she lived in Scotland, had a Runrig song "Running to the Light" play as her wakeup music on January 27; her CD of Runrig music was recovered in the debris and presented to the band by Clark's husband and son.


See also

* Criticism of the Space Shuttle program *
Engineering disasters Engineering disasters often arise from shortcuts in the design process. Engineering is the science and technology used to meet the needs and demands of society. These demands include buildings, aircraft, vessels, and computer software. In order ...
* Expedition 6


References


External links


NASA's Space Shuttle ''Columbia'' and her crew

Doppler radar animation of the debris after break up


nbsp;– February 4, 2003



* ttp://www.collectspace.com/news/news-020104a.html Photos of recovered debris stored on the 16th floor of the Vehicle Assembly Building at KSC {{DEFAULTSORT:Columbia Articles containing video clips Kalpana Chawla