ISS040-E-010971 (12 June 2014) --- European Space Agency astronaut Alexander Gerst, Expedition 40 flight engineer, performs a checkout on an Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station.

ISS040-E-010972 (12 June 2014) --- European Space Agency astronaut Alexander Gerst, Expedition 40 flight engineer, uses a computer while working on an Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station.

Labeled cutaway line drawing of the Shuttle extravehicular mobility unit (EMU) identifies its various components and equipment. The portable life support system (PLSS) and protective layers of fabric (thermal micrometeoroid garment (TMG)) incorporated in this extravehicular activity (EVA) space suit are shown.

Side close-up view of crewman in high-fidelity Extravehicular Mobility Unit (EMU) / Manned Maneuvering Unit (MMU) mockup.

S128-E-007138 (31 Aug. 2009) --- Astronaut John “Danny” Olivas, STS-128 mission specialist, works near an Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station while Space Shuttle Discovery remains docked with the station.

ISS040-E-010979 (12 June 2014) --- European Space Agency astronaut Alexander Gerst, Expedition 40 flight engineer, uses a computer while working on an Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station.

S128-E-007295 (4 Sept. 2009) --- Astronaut John “Danny” Olivas, STS-128 mission specialist, has spent a good portion of his current mission in space either in the airlock, as in this case, or wearing one of the pictured extravehicular mobility unit (EMU) spacesuits doing work outside the International Space Station. His final of three scheduled sessions of extravehicular activity (EVA) is set for Sept. 5.

Dark view of two Extravehicular Mobility Units (EMUs) located in the Quest airlock. Photo taken by the Expedition 40 crew.

View of an Extravehicular Mobility Unit (EMU) stowed in the Quest airlock as seen by the Expedition 40 crew.

ISS018-E-042705 (23 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Quest Airlock of the International Space Station as he prepares for the mission's third scheduled session of extravehicular activity (EVA).

ISS018-E-042704 (23 March 2009) --- Astronaut Richard Arnold, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, gives a ?thumbs-up? signal as he prepares for the mission's third scheduled session of extravehicular activity (EVA) in the Quest Airlock of the International Space Station.

Portrait view of astronaut Jack Lousma in the Extravehicular Mobility Unit (EMU) at bldg 29 Weightless Environment Training Facility (WETF). He is wearing the EMU minus the helmet.

Dr. Norman E. Thagard, mission specialist for STS-7, moves through the hatchway of the mockup of the Space Shuttle orbiter which is part of JSC's weightless environment training facility (WETF). Thagard is wearing an extravehicular mobility unit and is practicing procedures used when performing an extravehicular activity (EVA) during a flight.

ISS018-E-041421 (21 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Quest Airlock of the International Space Station as the mission?s second session of extravehicular activity (EVA) draws to a close.

ISS018-E-041443 (21 March 2009) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Joseph Acaba, STS-119 mission specialist, is pictured in the Quest Airlock of the International Space Station as the mission's second session of extravehicular activity (EVA) draws to a close.

ISS018-E-041420 (21 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Quest Airlock of the International Space Station as the mission?s second session of extravehicular activity (EVA) draws to a close.

ISS018-E-041348 (21 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, waves as he prepares to leave the Quest Airlock of the International Space Station to begin the mission's second session of extravehicular activity (EVA).

ISS018-E-041448 (21 March 2009) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Steve Swanson, STS-119 mission specialist, is pictured in the Quest Airlock of the International Space Station as the mission's second session of extravehicular activity (EVA) draws to a close.

View of Mike Hopkins, Expedition 38 Flight Engineer (FE), during remove and replace (R&R) of Hard Upper Torso (HUT) of Extravehicular Mobility Unit (EMU), in the airlock (A/L) during preparation for EVA-24. Photo was taken during Expedition 38. Image was released by astronaut on Twitter.

ISS018-E-042724 (23 March 2009) --- Astronaut Richard Arnold, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Quest Airlock of the International Space Station as he prepares for the mission's third scheduled session of extravehicular activity (EVA). Japan Aerospace Exploration Agency (JAXA) astronaut Koichi Wakata, Expedition 18 flight engineer, is visible at bottom right.

ISS018-E-042717 (23 March 2009) --- Astronaut Richard Arnold, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, shakes hands with astronaut Michael Fincke, Expedition 18 commander, in the Quest Airlock of the International Space Station as he prepares for the mission's third scheduled session of extravehicular activity (EVA).

ISS018-E-042703 (23 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, prepares for the mission's third session of extravehicular activity (EVA) in the Quest Airlock of the International Space Station while Space Shuttle Discovery remains docked with the station. Astronauts Tony Antonelli (bottom right, mostly out of frame), STS-119 pilot; and Japan Aerospace Exploration Agency?s (JAXA) Koichi Wakata, Expedition 18 flight engineer, assist Acaba.

View of a pair of Extravehicular Mobility Units (EMUs) and assorted other bags in the Quest Airlock as documented by the Expedition 36 crew.

View of stowed Extravehicular Mobility Units (EMUs),in the Airlock (A/L). Photo was taken during Expedition 34.

United Space Alliance technicians wrap the lower portion of an Extravehicular Mobility Unit (EMU) spacesuit prior to removal from Space Shuttle Endeavour.

Astronaut Bruce McCandless during an underwater test of the Manned Maneuvering Unit (MMU) Flight Support Station (FSS) donning and doffing in the Bldg 29 Weightless Environment Training Facility (WETF). View is of McCandless wearing the extravehicular mobility unit (EMU), stepping into the MMU.

Attired in a training version of the Extravehicular Mobility Unit (EMU), astronaut Mary Ellen Weber gets help with the final touches of suit donning during a training session at JSC's Weightless Environment Training Facility (WETF). Training as a mission specialist for the STS-70 mission, Weber was about to rehearse a contingency space walk.

View of Extravehicular Mobility Unit (EMU) with geocaching travel bug,in the airlock (A/L). Photo was taken during Expedition 38. Image was released by astronaut on Twitter.

S98-09040 (June 1998) --- Astronaut James H. Newman, mission specialist, gets final touches on the training version of his Extravehicular Mobility Unit (EMU) space suit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) at the Johnson Space Center (JSC). The two assigned space walkers -- Newman and Jerry L. Ross -- shared the platform as it was lowered into the water where the pair moments later were training with full-scale mockups of the International Space Station (ISS) hardware with which they'll be working in space. One of those elements will be the Functional Cargo Block (FGB), which will have been launched a couple of weeks prior to STS-88. Once the FGB is captured using the Remote Manipulator System (RMS) of the Space Shuttle Endeavour, astronaut Nancy J. Currie, mission specialist, will maneuver the robot arm to dock the FGB to the conical mating adapter at the top of Node 1, to be carried in the Space Shuttle's cargo bay. In ensuing days, three Extravehicular Activity?s (EVA) by Ross and Newman will be performed to make power, data and utility connections between the two modules.

S95-15847 (26 July 1995) --- Wearing a training version of the Extravehicular Mobility Unit (EMU) space suit, astronaut Mario Runco Jr., mission specialist, prepares to participate in an underwater rehearsal of a contingency Extravehicular Activity (EVA). This type of training routinely takes place in the 25-feet deep pool of the Johnson Space Center's (JSC) Weightless Environment Training Center (WET-F). The training prepares at least two crew members on each flight for procedures to follow outside the spacecraft in event of failure of remote methods to perform various chores.

ISS018-E-041237 (19 March 2009) --- Astronaut Richard Arnold, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, and astronaut Lee Archambault, STS-119 commander, shake hands in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronaut Michael Fincke, Expedition 18 commander, is visible at top.

ISS018-E-041435 (21 March 2009) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Joseph Acaba, STS-119 mission specialist, is pictured in the Quest Airlock of the International Space Station as the mission's second session of extravehicular activity (EVA) draws to a close. Astronaut Tony Antonelli, STS-119 pilot, assists with the doffing of the spacesuit. Astronaut Michael Fincke, Expedition 18 commander, is visible in the background.

ISS018-E-041263 (19 March 2009) --- Astronauts Michael Fincke (foreground), Expedition 18 commander; and Tony Antonelli, STS-119 pilot, assist astronaut Steve Swanson, STS-119 mission specialist, with the doffing of his Extravehicular Mobility Unit (EMU) spacesuit in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close.

ISS018-E-041214 (19 March 2009) --- Astronauts Steve Swanson (right) and Richard Arnold, both STS-119 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits, are pictured in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronauts Michael Fincke (partially out of frame), Expedition 18 commander; and Tony Antonelli, STS-119 pilot, assist with the doffing of the spacesuits.

ISS018-E-041344 (21 March 2009) --- Astronaut Steve Swanson, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, prepares for the mission's second session of extravehicular activity (EVA) in the Quest Airlock of the International Space Station while Space Shuttle Discovery remains docked with the station. Astronauts Tony Antonelli (left), STS-119 pilot; and Japan Aerospace Exploration Agency?s (JAXA) Koichi Wakata, Expedition 18 flight engineer, assist Swanson.

ISS018-E-041234 (19 March 2009) --- Astronaut Steve Swanson, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, and astronaut Lee Archambault, STS-119 commander, shake hands in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronaut Michael Fincke, Expedition 18 commander, is visible at top left.

ISS018-E-041208 (19 March 2009) --- Astronauts Steve Swanson (right) and Richard Arnold, both STS-119 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits, are pictured in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronauts Michael Fincke (center background), Expedition 18 commander; and Tony Antonelli, STS-119 pilot, assist with the doffing of the spacesuits.

ISS018-E-041428 (21 March 2009) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Steve Swanson, STS-119 mission specialist, is pictured in the Quest Airlock of the International Space Station as the mission's second session of extravehicular activity (EVA) draws to a close. Astronaut Tony Antonelli, STS-119 pilot, assists with the doffing of the spacesuit.

ISS018-E-041080 (19 March 2009) --- Astronauts Steve Swanson (right) and Richard Arnold, both STS-119 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits, are pictured in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronaut Tony Antonelli, pilot, assists with the doffing of the spacesuits.

ISS018-E-041243 (19 March 2009) --- Astronauts Steve Swanson (right) and Richard Arnold, both STS-119 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits, are pictured in the Quest Airlock of the International Space Station as the mission's first scheduled session of extravehicular activity (EVA) draws to a close. Astronauts Michael Fincke (top center), Expedition 18 commander; and Tony Antonelli, STS-119 pilot, assist with the doffing of the spacesuits.

A ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU) is seen Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington, DC. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station. Photo Credit: (NASA/Joel Kowsky)

Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), is seen during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), is seen during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

Expedition 39 flight engineers Steve Swanson and Rick Mastracchio work to remove and replace the Fan Pump Separator (FPS) on Extravehicular Mobility Unit (EMU) 3005. Image was taken in the Quest Airlock (A/L) and was released by Swanson on Instagram.

Astronaut Joe H. Engle, STS-2 commander, practices donning and doffing his extravehicular mobility unit (EMU) in the weightless environment afforded aboard a KC-135 "zero-gravity" aircraft.

Expedition 39 flight engineer Rick Mastracchio poses for a photo with the replacement Fan Pump Separator (FPS) and Extravehicular Mobility Unit (EMU) 3005. Image was taken in the Quest Airlock (A/L) during FPS remove and replace operations.

ISS040-E-086597 (1 Aug. 2014) --- Two unoccupied Extravehicular Mobility Unit (EMU) spacesuits, photographed by an Expedition 40 crew member, appear to hold stowage containers in the Quest airlock of the International Space Station.

ISS040-E-086600 (1 Aug. 2014) --- Two unoccupied Extravehicular Mobility Unit (EMU) spacesuits, photographed by an Expedition 40 crew member, appear to hold stowage containers in the Quest airlock of the International Space Station.

European Space Agency astronaut Luca Parmitano (left) and Astronaut Chris Cassidy,both Expedition 36 flight engineers,pose for a candid photo with Extravehicular Mobility Unit (EMU) hardware in the Quest Airlock.

S94-40051 (1 August 1994) --- Attired in a training version of the Extravehicular Mobility Unit (EMU), astronaut Scott E. Parazynski, mission specialist, prepares to be submerged in a 25-feet deep pool at the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F). Though no extravehicular activity (EVA) is planned for the mission, at least two astronauts are trained to perform tasks that would require a space walk in the event of failure of remote systems. In November, Parazynski will join four other NASA astronauts and a European mission specialist for a week and a half in space aboard the Space Shuttle Atlantis. The flight will support the Atmospheric Laboratory for Applications and Science (ATLAS-3) mission.

AS16-117-18826 (23 April 1972) --- Astronaut John W. Young collects samples at the North Ray Crater geological site during the mission's third and final Apollo 16 extravehicular activity (EVA). He has a rake in his hand, and the gnomon is near his foot. Note how soiled Young's Extravehicular Mobility Unit (EMU) is. While astronauts Young, commander; and Charles M. Duke Jr., lunar module pilot; descended in the Apollo 16 Lunar Module (LM) "Orion" to explore the Descartes highlands landing site on the moon, astronaut Thomas K. Mattingly II, command module pilot, remained with the Command and Service Modules (CSM) "Casper" in lunar orbit.

S94-40049 (1 August 1994) --- Attired in a training version of the Extravehicular Mobility Unit (EMU), astronaut Joseph R. Tanner, mission specialist, prepares to be submerged in a 25-feet deep pool at the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F). Though no extravehicular activity (EVA) is planned for the mission, at least two astronauts are trained to perform tasks that would require a space walk in the event of failure of remote systems. In November, Tanner will join four other NASA astronauts and a European mission specialist for a week and a half in space aboard the Space Shuttle Atlantis. The flight will support the Atmospheric Laboratory for Applications and Science (ATLAS-3) mission.

S119-E-006970 (21 March 2009) --- Astronaut Steve Swanson, STS-119 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Quest Airlock of the International Space Station as the mission’s second session of extravehicular activity (EVA) draws to a close.

Attired in a training version of the Extravehicular Mobility Unit (EMU), Astronaut Mary Ellen Weber participates in a training session at JSC's Weightless Environment Training Facility (WETF). Training as a mission specialist for the STS-70 mission, Weber was about to rehearse a contingency space walk. One of several SCUBA-equipped divers waits to assist in the rehearsal in the water.

ISS041-E-017047 (19 Sept. 2014) --- NASA astronaut Reid Wiseman (left) and European Space Agency astronaut Alexander Gerst, both Expedition 41 flight engineers, take a moment to pose for a photo with two Extravehicular Mobility Unit (EMU) spacesuits in the Quest airlock of the International Space Station while preparing for two spacewalks scheduled in October 2014.

S68-34582 (1968) --- With its exterior removed, the Apollo portable life support system (PLSS) can be easily studied. The PLSS is worn as a backpack over the Extravehicular Mobility Unit (EMU) a multi-layered spacesuit used for outside-the-spacecraft activity. JSC photographic frame no. S68-34582 is a wider view of the exposed interior working parts of the PLSS and its removed cover.

S68-34580 (1968) --- With its exterior removed, the Apollo portable life support system (PLSS) can be easily studied. The PLSS is worn as a backpack over the Extravehicular Mobility Unit (EMU), a multi-layered spacesuit used for outside-the-spacecraft activity. JSC photographic frame no. S68-34582 is a close-up view of the working parts of the PLSS.

S84-33898 (21 May 1984) --- Astronaut Jon A. McBride, 41-G pilot, assists his crewmate, Astronaut Kathryn D. Sullivan with the glove portion of her extravehicular mobility unit (EMU) prior to Dr. Sullivan's underwater session in the Johnson Space Center's weightless environment training facility (WET-F). Mission specialists Sullivan and David C. Leestma are scheduled for extravehicular activity (EVA) on the Columbia for NASA's 17th scheduled flight.

AS16-117-18825 (23 April 1972) --- Astronaut John W. Young, Apollo 16 commander, with a sample bag in his left hand, moves toward the bottom part of the gnomon (center) while collecting samples at the North Ray Crater geological site. Note how soiled Young's Extravehicular Mobility Unit (EMU) is during this the third and final Apollo 16 extravehicular activity (EVA). The Lunar Roving Vehicle (LRV) is parked at upper left.

51I-07-015 (4-5 Sept 1985) --- All five STS 51-I crewmembers pose with one of two extravehicular mobility unit (EMU) spacesuits used by Astronauts van Hoften and Fisher on their two-day EVA.

ISS040-E-080769 (28 July 2014) --- NASA astronauts Steve Swanson (left), Expedition 40 commander, and Reid Wiseman, flight engineer, work in tandem to perform in-flight maintenance on an Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station.

ISS041-E-016637 (16 Sept. 2014) --- NASA astronaut Reid Wiseman (center background), Expedition 41 flight engineer, works among stowed equipment in the Quest airlock of the International Space Station. Two Extravehicular Mobility Unit (EMU) spacesuits are visible in the foreground.

ISS041-E-016635 (16 Sept. 2014) --- NASA astronaut Reid Wiseman (center background), Expedition 41 flight engineer, works among stowed equipment in the Quest airlock of the International Space Station. Two Extravehicular Mobility Unit (EMU) spacesuits are visible in the foreground.

Astronaut Thomas D. Akers gets assistance in donning a training version of the Shuttle extravehicular mobility unit (EMU) space suit prior to a training session in the Neutral Buoyancy Simulator at Marshall Space Flight Center (MSFC) (39735); Astronaut Kathryn C. Thornton (foreground) and Thomas Akers, STS-61 mission specialists scheduled for extravehicular activity (EVA) duty, prepare for an underwater rehearsal session. Thornton recieves assistance from a technician in donning her EMU gloves (39736).

STS-38 Mission Specialist (MS) Carl J. Meade, wearing extravehicular mobility unit (EMU) upper torso, takes a breather from suit donning activities in JSC's Weightless Environment Training Facility (WETF) Bldg 29. Meade is preparing for an underwater extravehicular activity (EVA) simulation. During the training exercise, Meade will rehearse contingency EVA procedures for the STS-38 mission aboard Atlantis, Orbiter Vehicle (OV) 104.

S73-31323 (30 June 1973) --- Astronaut Jack R. Lousma, Skylab 3 pilot, practices procedures for extravehicular activity (EVA) in his Extravehicular Mobility Unit (EMU) spacesuit during Skylab 3 prelaunch training at Johnson Space Center. He is working with a mock-up of a trunion plug plate which is on the space station's deployment assembly. Photo credit: NASA

United Space Alliance flight systems technicians Troy Mann, Mark Shimei and Jim Smodell remove the lower portion of an Extravehicular Mobility Unit (EMU) suit from Endeavour's airlock.

S93-31701 (3 April 1993) --- Displaying the flexibility of his training version of the Shuttle Extravehicular Mobility Unit (EMU) space suit, astronaut David A. Wolf participates in training for contingency Extravehicular Activity (EVA) for the STS-58 mission. Behind Wolf, sharing the platform with him was astronaut Shannon W. Lucid. For simulation purposes, the two mission specialists were about to be submerged to a point of neutral buoyancy in the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F). Though the Spacelab Life Sciences (SLS-2) mission does not include a planned EVA, all crews designate members to learn proper procedures to perform outside the spacecraft in the event of failure of remote means to accomplish those tasks.

S128-E-006300 (29 Aug. 2009) --- Astronaut John “Danny” Olivas, STS-128 mission specialist, poses for a photo while holding an Extravehicular Mobility Unit (EMU) spacesuit helmet on the Space Shuttle Discovery during flight day two activities.

S128-E-006302 (29 Aug. 2009) --- European Space Agency astronaut Christer Fuglesang, STS-128 mission specialist, is pictured between two Extravehicular Mobility Unit (EMU) spacesuits on the Space Shuttle Discovery during flight day two activities.

AS09-20-3094 (6 March 1969) --- Astronaut Russell L. Schweickart, lunar module pilot, stands in "golden slippers" on the Lunar Module porch during his extravehicular activity on the fourth day of the Apollo 9 Earth-orbital mission. This photograph was taken from inside the Lunar Module "Spider". The Command and Service Modules were docked to the LM. Schweickart is wearing an Extravehicular Mobility Unit (EMU). Inside the "Spider" was astronaut James A. McDivitt, Apollo 9 crew commander. Astronaut David R. Scott, command module pilot, remained at the controls of the Command Module, "Gumdrop."

S93-33101 (5 Apr 1993) --- Wearing a training version of Space Shuttle Extravehicular Mobility Unit (EMU), astronaut Kathryn C. Thornton uses the giant pool of the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F) to rehearse for the Hubble Space Telescope (HST) repair mission. Standing on a mobile foot restraint connected to the Shuttle's robot arm, Thornton grasps a large structure which attaches to the Wide Field/Planetary Camera (WF/PC). The current WF/PC on the HST will be replaced with WF/PC-2. Out of frame is astronaut Thomas D. Akers, who will join Thornton in STS-61 EVA. A SCUBA-equipped diver can be seen in the background. A number of divers are on hand for all training sessions in the WET-F. A total of five extravehicular activity (EVA) sessions will be conducted during the scheduled December mission of the Endeavour.

NASA Associate Administrator for the Office of Communications Bettina Inclán moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA astronaut Kate Rubins, and Chris Hansen, Manager of the Extravehicular Activity office at NASA’s Johnson Space Center during the Artemis Generation Spacesuit event, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The Exploration Extravehicular Mobility Unit (xEMU) suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. The Orion Crew Survival System (OCSS) suit is designed for a custom fit and incorporates safety technology and mobility features that will help protect astronauts on launch day, in emergency situations, high-risk parts of missions near the Moon, and during the high-speed return to Earth. Photo Credit: (NASA/Joel Kowsky)

NASA astronaut Kate Rubins answers an audience question during a panel discussion with NASA Administrator Jim Bridenstine and Chris Hansen, Manager of the Extravehicular Activity office at NASA’s Johnson Space Center during the Artemis Generation Spacesuit event, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The Exploration Extravehicular Mobility Unit (xEMU) suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. The Orion Crew Survival System (OCSS) suit is designed for a custom fit and incorporates safety technology and mobility features that will help protect astronauts on launch day, in emergency situations, high-risk parts of missions near the Moon, and during the high-speed return to Earth. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine, left, NASA astronaut Kate Rubins, and Chris Hansen, Manager of the Extravehicular Activity office at NASA’s Johnson Space Center are seen during a panel discussion at the Artemis Generation Spacesuit event, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The Exploration Extravehicular Mobility Unit (xEMU) suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. The Orion Crew Survival System (OCSS) suit is designed for a custom fit and incorporates safety technology and mobility features that will help protect astronauts on launch day, in emergency situations, high-risk parts of missions near the Moon, and during the high-speed return to Earth. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine, left, gives a thumbs up as Amy Ross, a spacesuit engineer at NASA’s Johnson Space Center, center, high fives Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), after a demonstration of the suits enhanced mobility, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

S70-27034 (4 Feb. 1970) --- Astronaut Fred W. Haise Jr., lunar module pilot of the Apollo 13 lunar landing mission, simulates lunar surface extravehicular activity (EVA) during training exercises in the Kennedy Space Center's (KSC) Flight Crew Training Building (FCTB). Haise, wearing an Extravehicular Mobility Unit (EMU), is holding a Solar Wind Composition (SWC) experiment.

S93-30237 (5 Mar 1993) --- Wearing training versions of Space Shuttle Extravehicular Mobility Units (EMU), astronauts Thomas D. Akers (red stripe) and Kathryn C. Thornton use the spacious pool of the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F) to rehearse for the Hubble Space Telescope (HST) servicing mission. They are working with part of a full-scale mockup of HST.

S87-26630 (March 1987) --- Astronaut Charles D. (Sam) Gemar, wearing a training version of the Extravehicular Mobility Unit (EMU) space suit, prepares to be emersed in the 25-ft. deep waters of the Weightless Environment Training Facility (WET-F) at the Johnson Space Center (JSC). Once underwater, Gemar was able to achieve a neutrally buoyant state and to simulate the floating type activities of an astronaut in microgravity. Gemar began training as an astronaut candidate in the summer of 1985.

S93-30238 (5 Mar 1993) --- Wearing training versions of Space Shuttle Extravehicular Mobility Units (EMU), astronauts Thomas D. Akers (red stripe) and Kathryn C. Thornton use the spacious pool of the Johnson Space Center's (JSC) Weightless Environment Training Facility (WET-F) to rehearse for the Hubble Space Telescope (HST) repair mission. They are working with a full scale mockup of a solar array fixture.

STS-31 Mission Specialist (MS) Kathryn D. Sullivan, wearing extravehicular mobility unit (EMU) & communications carrier assembly (CCA), attaches service and cooling umbilical (SCU) to the EMU connection on the display & control module (DCM) during contingency extravehicular activity (EVA) preparations in the airlock of Discovery, Orbiter Vehicle (OV) 103. The procedure was completed in case an EVA was required to support Hubble Space Telescope (HST) deployment.

STS-38 Mission Specialist (MS) Robert C. Springer, wearing extravehicular mobility unit (EMU), fastens the strap on his communications carrier assembly (CCA) cap during suit donning in JSC's Weightless Environment Training Facility (WETF) Bldg 29. Positioned on the WETF platform at pool side, Springer is preparing for an underwater extravehicular activity (EVA) simulation. During the training exercise, Springer will rehearse contingency EVA procedures for the STS-38 mission aboard Atlantis, Orbiter Vehicle (OV) 104.

STS-38 Mission Specialist (MS) Robert C. Springer dons extravehicular mobility unit (EMU) upper torso with technicians' assistance in JSC's Weightless Environment Training Facility (WETF) Bldg 29. Positioned on the WETF platform at pool side, Springer is preparing for an underwater extravehicular activity (EVA) simulation. During the training session, Springer will rehearse contingency EVA procedures for the STS-38 mission aboard Atlantis, Orbiter Vehicle (OV) 104.

iss069e003933 (April 17, 2023) --- UAE (United Arab Emirates) astronaut and Expedition 69 Flight Engineer Sultan Alneyadi prepares an Extravehicular Mobility Unit, or spacesuit, inside the International Space Station's Quest airlock for an upcoming spacewalk.

AS09-19-2994 (6 March 1969) --- Astronaut Russell L. Schweickart, lunar module pilot, is photographed from the Command Module (CM) "Gumdrop" during his extravehicular activity (EVA) on the fourth day of the Apollo 9 Earth-orbital mission. He holds, in his right hand, a thermal sample which he is retrieving from the Lunar Module (LM) exterior. The Command and Service Modules (CSM) and LM "Spider" are docked. Schweickart, wearing an Extravehicular Mobility Unit (EMU), is standing in "golden slippers" on the LM porch. Visible on his back are the Portable Life Support System (PLSS) and Oxygen Purge System (OPS). Astronaut James A. McDivitt, Apollo 9 commander, was inside the "Spider". Astronaut David R. Scott, command module pilot, remained at the controls in the CM "Gumdrop".

jsc2024e052668_alt (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e052669_alt (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e052672_alt2 (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e052673_alt (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e052672_alt (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e052674_alt (July 17, 2024) --- Portrait of NASA Astronaut Jonny Kim in an Extravehicular Mobility Unit (EMU) spacesuit taken at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2025e044433 (May 6, 2025) --- NASA astronaut Chris Williams poses for a photo in an Extravehicular Mobility Unit spacesuit during vacuum chambers testing at NASA’s Johnson Space Center in Houston, Texas.

jsc2025e044425 (May 6, 2025) --- NASA astronaut Chris Williams poses for a photo in an Extravehicular Mobility Unit spacesuit during vacuum chambers testing at NASA’s Johnson Space Center in Houston, Texas.

S81-34432 (July 1981) --- Astronaut C. Gordon Fullerton, STS-3 pilot, takes part in a suit donning and doffing exercise aboard a KC-135 "zero-gravity" aircraft. Mission specialist/astronaut William F. Fisher holds a mirror to assist Fullerton with hose and cable linkups to his suit. A special parabolic pattern flown by the KC-135 provides short durations of weightlessness. Fullerton's suit is an Extravehicular Mobility Unit (EMU), used by astronauts when leaving the shirt-sleeve environment of their shuttle orbiter to go outside and perform tasks in the vacuum of space. There are no such EVA plans on STS-3, but the crewmen are trained in this area in the event of a contingency. Photo credit: NASA

NASA Administrator Jim Bridenstine, left, and Amy Ross, a spacesuit engineer at NASA’s Johnson Space Center, left, are seen with Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine, left, and Amy Ross, a spacesuit engineer at NASA’s Johnson Space Center, left, are seen with Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

S84-37532 (18 July 1984) --? Robert B. Thirsk, backup payload specialist for 41-G appears to be shaking hands with an unoccupied extravehicular mobility unit (EMU) during a familiarization flight aboard NASA?s KC-135 aircraft. Thirsk, representing Canada?s National Research Council (NRC), serves as backup to Marc Garneau on the seven-member crew for Challenger?s October 1984 flight. This aircraft is used extensively for training and exposing Shuttle crewmembers to weightlessness as well as for evaluation of equipment and experiments scheduled for future flights.

NASA Administrator Jim Bridenstine, left, and Amy Ross, a spacesuit engineer at NASA’s Johnson Space Center, left, are seen with Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

Amy Ross, a spacesuit engineer at NASA’s Johnson Space Center, is seen with Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine, left, high fives Kristine Davis, a spacesuit engineer at NASA’s Johnson Space Center, wearing a ground prototype of NASA’s new Exploration Extravehicular Mobility Unit (xEMU), during a demonstration of the suit, Tuesday, Oct. 15, 2019 at NASA Headquarters in Washington. The xEMU suit improves on the suits previous worn on the Moon during the Apollo era and those currently in use for spacewalks outside the International Space Station and will be worn by first woman and next man as they explore the Moon as part of the agency’s Artemis program. Photo Credit: (NASA/Joel Kowsky)