
Astronaut Michael Clifford places a liquid nitrogen Dewar containing frozen protein solutions aboard Russia's space station Mir during a visit by the Space Shuttle (STS-76). The protein samples were flash-frozen on Earth and will be allowed to thaw and crystallize in the microgravity environment on Mir Space Station. A later crew will return the Dewar to Earth for sample analysis. Dr. Alexander McPherson of the University of California at Riverside is the principal investigator. Photo credit: NASA/Johnson Space Center.

Astronaut Tom Akers places a liquid nitrogen Dewar containing frozen protein solutions aboard Russia's space Station Mir during a visit by the Space Shuttle (STS-79). The protein samples were flash-frozen on Earth and will be allowed to thaw and crystallize in the microgravity environment on Mir Space Station. A later crew will return the Dewar to Earth for sample analysis. Dr. Alexander McPherson of the University of California at Riverside is the principal investigator. Photo credit: NASA/Johnson Space Center.

Liquid nitrogen dewar loading at Kennedy Space Center for STS-71 flight with Stan Koszelak (right), University of California at Riverside, adn Tamara Chinareva (left), Russian Spacecraft Coporation-Energia. The picture shows Koszelak removing the insert from the transportation dewar.

Kim Nelson, left, of Sandalwood High School in Jacksonville, FL, helps Steven Nepowada, right, of Terry Parker High School in Jacksonville, practice loading a protein sample into a thermos-like container, known as Dewar. Students from Jacksonville worked with researchers from NASA/Marshall Space Flight Center (MSFC), as well as universities, in Huntsville, AL, on an experiment for the International Space Station (ISS). The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

ISS038-E-006765 (21 Nov. 2013) --- In the International Space Station's Destiny laboratory, NASA astronaut Rick Mastracchio, Expedition 38 flight engineer, prepares to replace a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI) after inserting biological samples into the trays.

ISS038-E-006757 (21 Nov. 2013) --- In the International Space Station's Destiny laboratory, NASA astronaut Rick Mastracchio, Expedition 38 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in order to insert biological samples into the trays.

ISS021-E-012527 (26 Oct. 2009) --- Canadian Space Agency astronaut Robert Thirsk, Expedition 21 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in order to insert biological samples into the trays in the Kibo laboratory of the International Space Station.

A Memphis student working at the University of Alabama in Huntsville prepares samples for the first protein crystal growth experiments plarned to be performed aboard the International Space Station (ISS). The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

Christiane Gumera, right, a student at Stanton College Preparatory High School in Jacksonville, AL, examines a protein sample while preparing an experiment for flight on the International Space Station (ISS). Merle Myers, left, a University of California, Irvine, researcher, prepares to quick-freeze protein samples in nitrogen. The proteins are in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be anlyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

A Memphis student working at the University of Alabama in Huntsville prepares samples for the first protein crystal growth experiments plarned to be performed aboard the International Space Station (ISS). The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

Memphis students working at the University of Alabama in Huntsville prepare samples for the first protein crystal growth experiments plarned to be performed aboard the International Space Station (ISS). The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

Chemist Arna Holmes, left, from the University of Alabama in Huntsville, teaches NaLonda Moorer, center, and Maricar Bana, right, both from Terry Parker High School in Jacksonville, Fl, procedures for preparing protein crystal growth samples for flight aboard the International Space Station (ISS). NASA/Marshall Space Flight Center in Huntsville, AL, is a sponsor for this educational activity. The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aborad the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center (MSFC)

Gravity Probe B (GP-B) is the relativity experiment developed at Stanford University to test two extraordinary predictions of Albert Einstein’s general theory of relativity. This photograph is of the Gravity Probe B flight dewar, a metal container made like a vacuum bottle that is used especially for storing liquefied gases, that will maintain the experiment at a temperature just above absolute zero, staying cold for two years. The experiment will measure, very precisely, the expected tiny changes in the direction of the spin axes of four gyroscopes contained in an Earth-orbiting satellite at 400-mile altitude. So free are the gyroscopes from disturbance that they will provide an almost perfect space-time reference system. They will measure how space and time are very slightly warped by the presence of the Earth, and, more profoundly, how the Earth’s rotation very slightly drags space-time around with it. These effects, though small for the Earth, have far-reaching implications for the nature of matter and the structure of the Universe. GP-B is among the most thoroughly researched programs ever undertaken by NASA. This is the story of a scientific quest in which physicists and engineers have collaborated closely over many years. Inspired by their quest, they have invented a whole range of technologies -- technologies that are already enlivening other branches of science and engineering. Launched in 2004 and managed for NASA by the Marshall Space Flight Center, development of the GP-B is the responsibility of Stanford University, with major subcontractor Lockheed Martin Corporation. (Photo Credit: Lockheed Martin Corporation/R. Underwood)
Initial assembly of NASA Wide-field Infrared Survey Explorer cryostat. The cryostat is a 2-stage solid hydrogen dewar that is used to cool the WISE optics and detectors. Here the cryostat internal structures are undergoing their initial vacuum pumpdown.

Gaseous Nitrogen Dewar apparatus developed by Dr. Alex McPherson of the University of California, Irvine for use aboard Mir and the International Space Station allows large quantities of protein samples to be crystallized in orbit. The specimens are contained either in plastic tubing (heat-sealed at each end). Biological samples are prepared with a precipitating agent in either a batch or liquid-liquid diffusion configuration. The samples are then flash-frozen in liquid nitrogen before crystallization can start. On orbit, the Dewar is placed in a quiet area of the station and the nitrogen slowly boils off (it is taken up by the environmental control system), allowing the proteins to thaw to begin crystallization. The Dewar is returned to Earth after one to four months on orbit, depending on Shuttle flight opportunities. The tubes then are analyzed for crystal presence and quality

KENNEDY SPACE CENTER, FLA. - After removing its cover, technicians look over the Minus Eighty Lab Freezer for ISS (MELFI), provided as Laboratory Support Equipment by the European Space Agency for the International Space Station. The lab will provide cooling and storage for reagents, samples and perishable materials in four insulated containers called dewars with independently selectable temperatures of -80°C, -26°C, and +4°C. It also will be used to transport samples to and from the station. The MELFI is planned for launch on the ULF-1 mission.

KENNEDY SPACE CENTER, FLA. - The Minus Eighty Lab Freezer for ISS (MELFI), provided as Laboratory Support Equipment by the European Space Agency for the International Space Station, is seen in the Space Station Processing Facility. The lab will provide cooling and storage for reagents, samples and perishable materials in four insulated containers called dewars with independently selectable temperatures of -80°C, -26°C, and +4°C. It also will be used to transport samples to and from the station. The MELFI is planned for launch on the ULF-1 mission.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, technicians remove the cover from the Minus Eighty Lab Freezer for ISS(MELFI) provided as Laboratory Support Equipment by the European Space Agency for the International Space Station. The lab will provide cooling and storage for reagents, samples and perishable materials in four insulated containers called dewars with independently selectable temperatures of -80°C, -26°C, and +4°C. It also will be used to transport samples to and from the station. The MELFI is planned for launch on the ULF-1 mission.

ISS024-E-012546 (26 Aug. 2010) --- NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, prepares to insert biological samples in a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS033-E-016196 (26 Oct. 2012) --- Japan Aerospace Exploration Agency astronaut Aki Hoshide, Expedition 33 flight engineer, closes a dewar cover after servicing the Minus Eighty Laboratory Freezer for ISS-2 (MELFI-2) in the Destiny laboratory of the International Space Station.

ISS037-E-010711 (5 Oct. 2013) --- In the International Space Station’s Destiny laboratory, NASA astronaut Michael Hopkins, Expedition 37 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in order to insert biological samples into the trays.

James Fesmire pours liquid nitrogen from a dewar into an insulated glass flask in the Cryogenics Test Laboratory at NASA's Kennedy Space Center on Mar. 20, 2019. See-through flasks are a useful tool in cryogenics to examine various physical phenomena.

ISS024-E-006707 (28 June 2010) --- After inserting biological samples, NASA astronaut Doug Wheelock, Expedition 24 flight engineer, replaces a dewar tray in the Minus Eighty Laboratory Freezer for ISS-2 (MELFI-2) in the Destiny laboratory of the International Space Station.

ISS029-E-015110 (4 Oct. 2011) --- In the International Space Station?s Kibo laboratory, NASA astronaut Mike Fossum, Expedition 29 commander, inserts a dewar tray of samples into the Minus Eighty Laboratory Freezer for ISS (MELFI-1) for the second NUTRITION w/Repository collection period.

ISS024-E-007346 (2 July 2010) --- NASA astronauts Tracy Caldwell Dyson (background) and Shannon Walker, both Expedition 24 flight engineers, prepare to insert biological samples in a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS027-E-014286 (14 April 2011) --- NASA astronaut Ron Garan, Expedition 27 flight engineer, replaces a dewar tray containing biological samples in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS037-E-010725 (5 Oct. 2013) --- NASA astronaut Michael Hopkins, Expedition 37 flight engineer, prepares to insert samples into a Minus Eighty Laboratory Freezer for ISS (MELFI) dewar tray in the International Space Station’s Destiny laboratory.

ISS024-E-007331 (2 July 2010) --- After inserting biological samples, NASA astronaut Shannon Walker, Expedition 24 flight engineer, replaces a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS029-E-015096 (4 Oct. 2011) --- In the International Space Station?s Kibo laboratory, NASA astronaut Mike Fossum, Expedition 29 commander, prepares to insert samples into a Minus Eighty Laboratory Freezer for ISS (MELFI-1) dewar tray for the second NUTRITION w/Repository collection period.

ISS024-E-012555 (26 Aug. 2010) --- NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, replaces a dewar tray containing biological samples in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS040-E-085159 (1 Aug. 2014) --- NASA astronaut Reid Wiseman, Expedition 40 flight engineer, works with Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) dewars in the Destiny laboratory of the Earth-orbiting International Space Station.

ISS024-E-012553 (26 Aug. 2010) --- NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, replaces a dewar tray containing biological samples in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS024-E-006705 (28 June 2010) --- After inserting biological samples, NASA astronaut Doug Wheelock, Expedition 24 flight engineer, replaces a dewar tray in the Minus Eighty Laboratory Freezer for ISS-2 (MELFI-2) in the Destiny laboratory of the International Space Station.

ISS024-E-012548 (26 Aug. 2010) --- NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, prepares to insert biological samples in a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

ISS021-E-032003 (22 Nov. 2009) --- Canadian Space Agency astronaut Robert Thirsk, Expedition 21 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in the Destiny laboratory of the International Space Station while space shuttle Atlantis (STS-129) remains docked with the station.

ISS024-E-007344 (2 July 2010) --- After inserting biological samples, NASA astronaut Shannon Walker, Expedition 24 flight engineer, replaces a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

High school students screen crystals of various proteins that are part of the ground-based work that supports Alexander McPherson's protein crystal growth experiment. The students also prepared and stored samples in the Enhanced Gaseous Nitrogen Dewar, which was launched on the STS-98 mission for delivery to the ISS. The crystals grown on the ground will be compared with crystals grown in orbit. Participants include Joseph Negron, of Terry Parker High School, Jacksonville, Florida; Megan Miskowski (shown), of Ridgeview High School, Orange Park, Florida; and Sam Swank, of Fletcher High School, Neptune Beach, Florida. The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center.

High school students screen crystals of various proteins that are part of the ground-based work that supports Alexander McPherson's protein crystal growth experiment. The students also prepared and stored samples in the Enhanced Gaseous Nitrogen Dewar, which was launched on the STS-98 mission for delivery to the ISS. The crystals grown on the ground will be compared with crystals grown in orbit. Participants include Joseph Negron, of Terry Parker High School, Jacksonville, Florida; Megan Miskowski, of Ridgeview High School, Orange Park, Florida; and Sam Swank (shown), of Fletcher High School, Neptune Beach, Florida. The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center.

High school students screen crystals of various proteins that are part of the ground-based work that supports Alexander McPherson's protein crystal growth experiment. The students also prepared and stored samples in the Enhanced Gaseous Nitrogen Dewar, which was launched on the STS-98 mission for delivery to the ISS. The crystals grown on the ground will be compared with crystals grown in orbit. Participants include Joseph Negron (shown), of Terry Parker High School, Jacksonville, Florida; Megan Miskowski, of Ridgeview High School, Orange Park, Florida; and Sam Swank, of Fletcher High School, Neptune Beach, Florida. The proteins are placed in plastic tubing that is heat-sealed at the ends, then flash-frozen and preserved in a liquid nitrogen Dewar. Aboard the ISS, the nitrogen will be allowed to evaporated so the samples thaw and then slowly crystallize. They will be analyzed after return to Earth. Photo credit: NASA/Marshall Space Flight Center.

iss073e0071610 (May 16, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Jonny Kim removes a cryogenic storage unit, called a dewar, containing frozen protein crystal samples from a science freezer located inside International Space Station's Kibo laboratory module. The research activities were part of a technology demonstration potentially enabling the synthesis of medications during deep space missions and improving the pharmaceutical industry on Earth.

iss073e0071611 (May 16, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Jonny Kim removes a cryogenic storage unit, called a dewar, containing frozen protein crystal samples from a science freezer located inside International Space Station's Kibo laboratory module. The research activities were part of a technology demonstration potentially enabling the synthesis of medications during deep space missions and improving the pharmaceutical industry on Earth.

iss072e861307 (March 27, 2025) --- JAXA (Japan Aerospace Exploration Agency) astronaut and Expediion 72 Flight Engineer Takuya Onishi inserts a cryogenic storage unit, called a dewar, containing blood samples collected from a crew member into a science freezer for preservation and later analysis. The Minus Eighty-Degree Laboratory Freezer for International Space Station, or MELFI, is a research freezer that maintains experiment samples at ultra-cold temperatures in microgravity.

iss073e0071617 (May 16, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Jonny Kim removes a cryogenic storage unit, called a dewar, containing frozen protein crystal samples from a science freezer located inside International Space Station's Kibo laboratory module. The research activities were part of a technology demonstration potentially enabling the synthesis of medications during deep space missions and improving the pharmaceutical industry on Earth.

ISS030-E-033272 (24 Dec. 2011) --- European Space Agency astronaut Andre Kuipers, Expedition 30 flight engineer, prepares to insert ESA Role of Apoptosis in Lymphocyte Depression 2 (ROALD-2) experiment samples into a Minus Eighty Laboratory Freezer for ISS (MELFI-1) dewar tray located in the International Space Station's Kibo laboratory.

Dr. Robert Richmond extracts breast cell tissue from one of two liquid nitrogen dewars. NASA's Marshall Space Flight Center (MSFC) is sponsoring research with Bioreactors, rotating wall vessels designed to grow tissue samples in space, to understand how breast cancer works. This ground-based work studies the growth and assembly of human mammary epithelial cells (HMEC) from breast cancer susceptible tissue. Radiation can make the cells cancerous, thus allowing better comparisons of healthy vs. tunourous tissues.

ISS020-E-007603 (7 June 2009) --- European Space Agency astronaut Frank De Winne, Expedition 20 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in order to insert biological samples into the trays in the Kibo laboratory of the International Space Station. Samples were taken as part of the Nutritional Status Assessment (Nutrition) with Repository experiment, a study done by NASA to date of human physiologic changes during long-duration spaceflight.

ISS020-E-007577 (6 June 2009) --- European Space Agency astronaut Frank De Winne, Expedition 20 flight engineer, returns a dewar tray to the Minus Eighty Laboratory Freezer for ISS (MELFI) after inserting biological samples into the trays in the Kibo laboratory of the International Space Station. Samples were taken as part of the Nutritional Status Assessment (Nutrition) with Repository experiment, a study done by NASA to date of human physiologic changes during long-duration spaceflight.

iss072e808609 (March 20, 2025) --- NASA astronaut and Expedition 72 Flight Engineer Nichole Ayers inserts a cryogenic storage unit, called a dewar, containing blood samples collected from a crew member into a science freezer for preservation and later analysis. The Minus Eighty-Degree Laboratory Freezer for International Space Station, or MELFI, is a research freezer that maintains experiment samples at ultra-cold temperatures in microgravity.

iss073e0251266 (June 27, 2025) --- Axiom Mission 4 private astronaut Tibor Kapu (at left) from Hungary loads a research sample-packed cryogenic storage unit, called a dewar, into a science freezer aboard the International Space Station's Kibo laboratory module. Expedition 73 Commander Takuya Onishi from JAXA (Japan Aerospace Exploration Agency) assisted Kapu during the science experiment transfers from the SpaceX Dragon crew spacecraft into the orbital outpost.

iss073e0424037 (Aug. 7, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Mike Fincke inserts a cryogenic storage unit, called a dewar, containing blood samples collected from a crew member into a science freezer for preservation and later analysis. The Minus Eighty-Degree Laboratory Freezer for International Space Station, or MELFI, is a research freezer that maintains experiment samples at ultra-cold temperatures in microgravity.

iss073e0548958 (Aug. 29, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Mike Fincke inserts a cryogenic storage unit, called a dewar, containing blood samples collected from a crew member into a science freezer for preservation and later analysis. The Minus Eighty-Degree Laboratory Freezer for International Space Station, or MELFI, is a research freezer that maintains experiment samples at ultra-cold temperatures in microgravity.

An engineer and technician at the National Aeronautics and Space Administration (NASA) Lewis Research Center install the instrumentation on spherical fuel tanks for an investigation of the behavior of liquids in microgravity. Lewis researchers were undertaking a broad effort to study the heat transfer properties of high energy propellants such as liquid hydrogen in microgravity. In the center’s 2.2-Second Drop Tower they investigated the wetting characteristics of liquid and the liquid-vapor configurations, and predicted the equilibrium state in microgravity conditions. Lewis was also conducting a series microgravity investigations which launched 9-inch diameter spherical dewars, seen here, on an Aerobee sounding rocket. A camera inside the rocket filmed the liquid hydrogen’s behavior during its 4 to 7 minutes of freefall. The researchers concluded, however, that they needed to extend the weightlessness period to obtain better results. So they designed an experiment to be launched on an Atlas missile that would provide 21 minutes of weightlessness. The experiment was flight qualified at Lewis. The 36-percent full liquid hydrogen stainless steel dewar was launched on the Atlas on February 25, 1964. The instrumentation measured temperature, pressure, vacuum, and liquid level. Temperature instrumentation indicated wall drying during the freefall. The resultant pressure-rise characteristics were similar to those used for the normal-gravity test.

ISS020-E-010025 (15 June 2009) --- Japan Aerospace Exploration Agency (JAXA) astronaut Koichi Wakata, Expedition 20 flight engineer, removes a dewar tray from the Minus Eighty Laboratory Freezer for ISS (MELFI) in order to insert biological samples into the trays in the Kibo laboratory of the International Space Station. Samples were taken as part of the Nutritional Status Assessment (Nutrition) with Repository experiment, a study done by NASA to date of human physiologic changes during long-duration spaceflight. Canadian Space Agency astronaut Robert Thirsk, flight engineer, assisted Wakata.

ISS020-E-010028 (15 June 2009) --- Japan Aerospace Exploration Agency (JAXA) astronaut Koichi Wakata, Expedition 20 flight engineer, returns a dewar tray to the Minus Eighty Laboratory Freezer for ISS (MELFI) after inserting biological samples into the trays in the Kibo laboratory of the International Space Station. Samples were taken as part of the Nutritional Status Assessment (Nutrition) with Repository experiment, a study done by NASA to date of human physiologic changes during long-duration spaceflight. Canadian Space Agency astronaut Robert Thirsk, flight engineer, assisted Wakata.

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, a technician assists as a special crane is used to lift one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians assist as a special crane is used to lift one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians help position a special crane in place to lift one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, a technician assists as a special crane lifts one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as a special crane lifts one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, space shuttle Atlantis’ three fuel cells are being removed from the payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians prepare to remove one of three fuel cells from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians prepare to remove one of three fuel cells from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as a special crane lifts one of the three fuel cells away from space shuttle Atlantis’ for securing on a special platform. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians secure space shuttle Atlantis’ three fuel cells to special platforms. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians assist as a special crane is used to lift one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as a special crane lifts one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians assist as a special crane is used to lift one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as a special crane lifts one of the three fuel cells away from space shuttle Atlantis’ payload bay. The fuel cells will be drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Atlantis’ mid-body and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Atlantis. The orbiter is being prepared for display at the Kennedy Space Center Visitor Complex. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, technicians position the the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) science rack for installation into the Multi-Purpose Logisitics Module Leonardo. Leonardo will fly on Space Shuttle Atlantis on mission STS-121. The MELFI will provide cooling and storage for scientific experiment samples and perishable materials in four insulated containers, known as dewars, with independently selectable temperatures of -80 degrees Celsius, -26 degrees Celsius, and +4 degrees Celsius. MELFI will also be used to transport samples to and from the Station. MELFI is provided as laboratory support equipment by the European Space Agency. STS-121 is the second Return to Flight mission to the International Space Station. The launch window extends from Sept. 9 through Sept. 24.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, technicians install the the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) science rack into the Multi-Purpose Logisitics Module Leonardo. Leonardo will fly on Space Shuttle Atlantis on mission STS-121. The MELFI will provide cooling and storage for scientific experiment samples and perishable materials in four insulated containers, known as dewars, with independently selectable temperatures of -80 degrees Celsius, -26 degrees Celsius, and +4 degrees Celsius. MELFI will also be used to transport samples to and from the Station. MELFI is provided as laboratory support equipment by the European Space Agency. STS-121 is the second Return to Flight mission to the International Space Station. The launch window extends from Sept. 9 through Sept. 24.

CAPE CANAVERAL, Fla. -- Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as space shuttle Discovery’s fuel cells are drained of all fluids. After all of the coolant is removed, the fuel cells will be returned to their previous location within Discovery’s mid-body. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, a crane hoists one of space shuttle Endeavour's three fuel cells out of the vehicle's payload bay. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. -- Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians prepare space shuttle Discovery’s three fuel cells to be drained of all fluids. After all of the coolant is removed, the fuel cells will be returned to their previous location within Discovery’s mid-body. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, technicians use a special crane to lift a fuel cell out of space shuttle Endeavour's payload bay. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, a technician guides a newly removed fuel cell up and out of space shuttle Endeavour's payload bay. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, technicians use a special crane to lift a fuel cell out of space shuttle Endeavour's payload bay. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. -- Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians monitor the progress as space shuttle Discovery’s fuel cells are drained of all fluids. After all of the coolant is removed, the fuel cells will be returned to their previous location within Discovery’s mid-body. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians prepare to re-install the three fuel cells in space shuttle Discovery’s mid-body. The fuel cells were removed and drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Technicians inside Kennedy Space Center's Orbiter Processing Facility-2 lower one of space shuttle Endeavour's recently removed fuel cells onto a waiting platform. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – Technicians inside Kennedy Space Center's Orbiter Processing Facility-2 lower one of space shuttle Endeavour's recently removed fuel cells onto a waiting platform. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) science rack (left) is moved into position for installation into the Multi-Purpose Logisitics Module Leonardo. Leonardo will fly on Space Shuttle Atlantis on mission STS-121. The MELFI will provide cooling and storage for scientific experiment samples and perishable materials in four insulated containers, known as dewars, with independently selectable temperatures of -80 degrees Celsius, -26 degrees Celsius, and +4 degrees Celsius. MELFI will also be used to transport samples to and from the Station. MELFI is provided as laboratory support equipment by the European Space Agency. STS-121 is the second Return to Flight mission to the International Space Station. The launch window extends from Sept. 9 through Sept. 24.

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians prepare to re-install the three fuel cells in space shuttle Discovery’s mid-body. The fuel cells were removed and drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, technicians prepare to install the the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) science rack into the Multi-Purpose Logisitics Module Leonardo. Leonardo will fly on Space Shuttle Atlantis on mission STS-121. The MELFI will provide cooling and storage for scientific experiment samples and perishable materials in four insulated containers, known as dewars, with independently selectable temperatures of -80 degrees Celsius, -26 degrees Celsius, and +4 degrees Celsius. MELFI will also be used to transport samples to and from the Station. MELFI is provided as laboratory support equipment by the European Space Agency. STS-121 is the second Return to Flight mission to the International Space Station. The launch window extends from Sept. 9 through Sept. 24.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, a technician prepares to install the the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) science rack into the Multi-Purpose Logisitics Module Leonardo. Leonardo will fly on Space Shuttle Atlantis on mission STS-121. The MELFI will provide cooling and storage for scientific experiment samples and perishable materials in four insulated containers, known as dewars, with independently selectable temperatures of -80 degrees Celsius, -26 degrees Celsius, and +4 degrees Celsius. MELFI will also be used to transport samples to and from the Station. MELFI is provided as laboratory support equipment by the European Space Agency. STS-121 is the second Return to Flight mission to the International Space Station. The launch window extends from Sept. 9 through Sept. 24.

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians re-install the three fuel cells in space shuttle Discovery’s mid-body. The fuel cells were removed and drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. -- Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, a technician prepares one of space shuttle Discovery’s three fuel cells to be drained of all fluids. After all of the coolant is removed, the fuel cells will be returned to their previous location within Discovery’s mid-body. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians prepare space shuttle Discovery’s three fuel cells to be drained of all fluids. After all of the coolant is removed, the fuel cells will be returned to their previous location within Discovery’s mid-body. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians prepare to re-install the three fuel cells in space shuttle Discovery’s mid-body. The fuel cells were removed and drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, technicians re-install the three fuel cells in space shuttle Discovery’s mid-body. The fuel cells were removed and drained of all fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Discovery’s mid-body and have been purged with inert gases and vented down. The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery. Discovery is being prepared for display at the Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – A NASA Railroad train passes in front of the 525-foot-tall Vehicle Assembly Building, left, and the twin bays of the Orbiter Processing Facility, right, at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train has crossed the Indian River on the railroad’s Jay Jay Railroad Bridge north of Launch Complex 39 at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train crosses the railroad’s Jay Jay Railroad Bridge north of Launch Complex 39 at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Engineers board a NASA Railroad train in preparation for its departure from the NASA Railroad Yard at NASA’s Kennedy Space Center in Florida. The train is headed for the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Technicians monitor the progress as one of space shuttle Endeavour's three fuel cells is removed from the vehicle's payload bay. The operation took place inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. All three of Endeavour's fuel cells were removed and will be drained of fluids. The hydrogen and oxygen dewars which feed reactants to the fuel cells remain in Endeavour's midbody and will be purged with inert gases and vented down. The work is part of the Space Shuttle Program's transition and retirement processing of shuttle Endeavour, which is being prepared for public display at the California Science Center in Los Angeles. Its ferry flight to California is targeted for mid-September. Endeavour was the last space shuttle added to NASA's orbiter fleet. Over the course of its 19-year career, Endeavour spent 299 days in space during 25 missions. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Glenn Benson

This STS-51F mission onboard Photograph shows some of the Spacelab-2 instruments in the cargo bay of the Orbiter Challenger. The Plasma Diagnostics Package (PDP). shown at the end of the Remote Manipulator System (RMS), used instruments on a subsatellite to study natural plasma processes, orbiter-induced plasma processes, and beam plasma physics. Fourteen instruments were mounted on the PDP for measurements of various plasma characteristics. The X-ray Telescope (XRT), is at the front. The goal of this investigation was to image and examine the X-ray emissions from clusters of galaxies in order to study the mechanisms that cause high-temperature emissions and to determine the weight of galactic clusters. The Small Helium-Cooled Infrared Telescope (IRT) is at the right behind the XRT. The objective of this investigation was to measure and map diffused and discrete infrared astronomical sources while evaluating the Space Shuttle as a platform for infrared astronomy. At the same time, a new large superfluid helium dewar system for cooling the telescope was evaluated. The egg-shaped Cosmic Ray Nuclei experiment (CRNE) is shown at the rear. This investigation was to study the composition of high-energy cosmic rays by using a large instrument exposed to space for a considerable period of time. Spacelab-2 (STS-51F, 19th Shuttle mission) was launched aboard the Space Shuttle Orbiter Challenger on July 29, 1985.

CAPE CANAVERAL, Fla. – A NASA Railroad train crosses the railroad’s Jay Jay Railroad Bridge north of Launch Complex 39 at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train crosses the railroad’s Jay Jay Railroad Bridge north of Launch Complex 39 at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train crosses the railroad’s Jay Jay Railroad Bridge north of Launch Complex 39 at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train passes in front of the 525-foot-tall Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. At the far right is the Orbiter Processing Facility. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A NASA Railroad train passes in front of the twin bays of the Orbiter Processing Facility at NASA’s Kennedy Space Center in Florida. The train is on its way to the Florida East Coast Railway interchange in Titusville, Fla., where the train’s helium tank cars, a liquid oxygen tank car, and a liquid hydrogen dewar or tank car will be transferred for delivery to the SpaceX engine test complex outside McGregor, Texas. The railroad cars were needed in support of the Space Shuttle Program but currently are not in use by NASA following the completion of the program in 2011. Originally, the tankers belonged to the U.S. Bureau of Mines. At the peak of the shuttle program, there were approximately 30 cars in the fleet. About half the cars were returned to the bureau as launch activity diminished. Five tank cars are being loaned to SpaceX and repurposed to support their engine tests in Texas. Eight cars previously were shipped to California on loan to support the SpaceX Falcon 9 rocket launches from Space Launch Complex-4 on Vandenberg Air Force Base. SpaceX already has three helium tank cars previously used for the shuttle program at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida. For more information, visit http://www.nasa.gov/spacex. Photo credit: NASA/Jim Grossmann