NASA 2021 Astronaut Candidate Announcement at Ellington Field. Photo Date: December 6, 2021. Location: Ellington Field - Hangar 135. Photographer: Robert Markowitz.

jsc2024e044936 (July 9, 2007) --- NASA astronaut Stephanie Wilson poses for a photo in a studio at NASA’s Johnson Space Center in Houston, Texas. Wilson will serve as a mission specialist for NASA’s SpaceX Crew-9 mission to the International Space Station, her fourth trip to space.

Astronaut Candidate Class of 2021. Photo Date: December 3, 2021. Location: JSC Mall. Photographer: Robert Markowitz

NASA astronauts on Mars in this illustration. https://photojournal.jpl.nasa.gov/catalog/PIA24031

jsc2025e011329 (Feb. 24, 2025) --- NASA astronaut and commander of NASA's SpaceX Crew-10 mission Anne McClain smiles and high fives SpaceX employees during a sendoff at the company’s facility in Hawthorne, California. Credit: SpaceX

jsc2025e011332 (Feb. 24, 2025) --- NASA astronaut and commander of NASA's SpaceX Crew-10 mission Anne McClain places the Crew-10 mission patch sticker on the Dragon training hatch at the company’s facility in Hawthorne, California. Credit: SpaceX

NASA Astronaut Nicole Mann becomes familiar with the spacecraft and its displays during a training at SpaceX in Hawthorne, California.

iss071e414062 (Aug. 3, 2024) --- NASA astronaut and Expedition 71 Flight Engineer Mike Barratt collects and organizes medical supplies aboard the International Space Station's Harmony module.

iss071e462164 (Aug. 6, 2024) --- NASA astronauts (from left) Jeanette Epps and Matthew Dominick, both Expedition 71 Flight Engineers, are pictured wearing personal protective equipment (PPE) shortly after entering the Northrop Grumman Cygnus space freighter. Inside Cygnus is a poster of former NASA astronaut Francis R. "Dick" Scobee for whom the spacecraft is named after. The duo was wearing PPE after opening the hatch and entering the vehicle to protect against potential dust or debris that may have dislodged during Cygnus' launch and ascent to space.

jsc2025e076268 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Adam Fuhrmann was selected by NASA to join the 2025 astronaut candidate class. He reported for duty in September 2025. Photo Credit: NASA - Helen Arase Vargas

jsc2025e076354 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Yuri Kubo was selected by NASA to join the 2025 astronaut candidate class. He reported for duty in September 2025.

jsc2025e076266 (09/22/2025) --- NASA 2025 Astronaut Candidate (ASCAN) Announcement Ceremony Photo Date: 09/22/2025 Location: JSC B2 - Teague Auditorium Photo Credit: NASA - Helen Arase Vargas

Photo Date: 2021-12-06 NASA announced its 2021 astronaut candidate class on Dec. 6, 2021. The 10 candidates, pictured here in an event at Ellington Field near NASA’s Johnson Space Center in Houston are Nichole Ayers, Christopher Williams, Luke Delaney, Jessica Wittner, Anil Menon, Marcos Berríos, Jack Hathaway, Christina Birch, Deniz Burnham, and Andre Douglas. NASA’s new astronaut candidates will begin about two years of training in January 2022, after which they could be assigned to missions performing research on the International Space Station, launching from American soil on spacecraft built by commercial companies, and launching on Artemis missions to the Moon on NASA’s new Orion spacecraft and Space Launch System rocket. Location: Ellington Hangar 135 Photographer: James Blair

jsc2025e076362 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Imelda Muller was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025.

jsc2025e076270 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Rebecca “Becky” Lawler was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025. Photo Credit: NASA - Helen Arase Vargas

jsc2025e076272 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Imelda Muller was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025.

jsc2025e076273 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Erin Overcash was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025.

jsc2024e067210_alt (July 17, 2024) --- NASA astronaut Jonny Kim poses for a portrait at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e067200_alt (July 17, 2024) --- NASA astronaut Jonny Kim poses for a portrait at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2025e076274 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Katherine Spies was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025. Photo Credit: NASA - Helen Arase Vargas

jsc2025e076333 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. The 10 candidates, pictured here at NASA’s Johnson Space Center in Houston are: U.S. Navy Lt. Cmdr. Erin Overcash, Katherine Spies, U.S. Air Force Maj. Cameron Jones, U.S. Army CW3 Ben Bailey, U.S. Air Force Maj. Adam Fuhrmann, Rebecca Lawler, Dr. Imelda Muller, Yuri Kubo, Anna Menon, and Dr. Lauren Edgar. Photo Credit: NASA - James Blair

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)

iss071e403564 (July 22, 2024) --- (From left) NASA astronauts Matthew Dominick and Mike Barratt, both Expedition 71 Flight Engineers, install the NanoRacks external platform inside the Kibo laboratory module's airlock. The platform from NanoRacks can host a variety of payloads placed outside the International Space Station and exposed to the external space environment for science experiments, technology demonstrations, and more.

jsc2024e018416 (March 5, 2024) --- NASA astronaut Chris Williams participates in media interviews shortly after his graduation as an astronaut in Houston, Texas.

jsc2018e067397_alt (Aug. 1, 2018) --- NASA Astronaut Doug Hurley has been assigned to the first flight of SpaceX’s Crew Dragon.

jsc2018e067361_alt (Aug. 1, 2018) --- NASA Astronaut Bob Behnken has been assigned to the first flight of SpaceX’s Crew Dragon.

jsc2018e067775_alt (Aug. 1, 2018) --- NASA Astronaut Victor Glover has been assigned to the second flight of SpaceX’s Crew Dragon.

jsc2018e067630_alt (Aug. 1, 2018) --- NASA Astronaut Mike Hopkins has been assigned to the second flight of SpaceX’s Crew Dragon.

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

jsc2025e076267 (09/22/2025) --- NASA announced its 2025 Astronaut Candidate Class on Sept. 22, 2025. Lauren Edgar was selected by NASA to join the 2025 astronaut candidate class. She reported for duty in September 2025. Photo Credit: NASA - Helen Arase Vargas

iss071e318564 (July 10, 2024) --- NASA astronaut and Boeing's Crew Flight Test Commander Butch Wilmore reviews procedures on a computer tablet for life support maintenance work aboard the International Space Station.

iss071e403579 (July 23, 2024) --- NASA astronaut and Expedition 71 Flight Engineer Tracy C. Dyson unpacks and examines research gear that is part of the BioFabrication Facility (BFF) located inside the International Space Station's Columbus laboratory module. The BFF is a research device being tested for its ability to print organ-like tissues in microgravity.

Bob Cabana, NASA associate administrator, speaks with the 2021 astronaut candidate class with NASA Administrator Bill Nelson and NASA Deputy Administrator Pam Melroy, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

Bob Cabana, NASA associate administrator, speaks with the 2021 astronaut candidate class with NASA Administrator Bill Nelson and NASA Deputy Administrator Pam Melroy, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

Bob Cabana, NASA associate administrator, speaks with the 2021 astronaut candidate class with NASA Administrator Bill Nelson and NASA Deputy Administrator Pam Melroy, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

iss057e132459 (Dec. 7, 2018) --- NASA astronaut Anne McClain is pictured exercising aboard the International Space Station inside the U.S. Destiny laboratory module.

jsc2024e005699 (Jan. 9, 2024) --- NASA astronaut Chris Williams poses for a photo in front of a T-38 jet at Ellington Field in Houston, Texas.

jsc2018e067716_alt (Aug. 1, 2018) --- NASA Astronaut Suni Williams has been assigned to the second flight of Boeing’s CST-100 Starliner.

jsc2018e066248_alt (Aug. 1, 2018) --- NASA Astronaut Josh Cassada has been assigned to the second flight of Boeing’s CST-100 Starliner.

jsc2018e067637_alt (Aug. 1, 2018) --- NASA Astronaut Nicole Mann has been assigned to the first flight of Boeing’s CST-100 Starliner.

jsc2018e067582_alt (Aug. 1, 2018) --- NASA Astronaut Eric Boe was assigned to the first flight of Boeing’s CST-100 Starliner in August 2018. Editor's note: Boe was replaced by NASA Astronaut E. Michael “Mike” Fincke in January 2019 due to medical reasons; he will replace Fincke as the assistant to the chief for commercial crew in the astronaut office at NASA’s Johnson Space Center.

NASA Astronaut Class 22 tours Goddard Space Flight Center

NASA Astronaut Class 22 tours Goddard Space Flight Center

NASA Astronaut Class 22 tours Goddard Space Flight Center

NASA Astronaut Class 22 tours Goddard Space Flight Center

NASA Astronaut Class 22 tours Goddard Space Flight Center

NASA Deputy Administrator Pam Melroy speaks with the 2021 astronaut candidate class with NASA Administrator Bill Nelson and Bob Cabana, NASA associate administrator, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA Deputy Administrator Pam Melroy speaks with the 2021 astronaut candidate class with NASA Administrator Bill Nelson and Bob Cabana, NASA associate administrator, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Bill Nelson speaks with the 2021 astronaut candidate class with NASA Deputy Administrator Pam Melroy and Bob Cabana, NASA associate administrator, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Drew Feustel speaks about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

iss071e414661 (Aug. 1, 2024) --- NASA astronaut and Expedition 71 Flight Engineer Tracy C. Dyson services research components inside the Solid Combustion Experiment Module (SCEM) aboard in the Interational Space Station's Kibo laboratory module. The SCEM enables combustion research in microgravity to study how materials burn in weightlessness and improve fire safety techniques aboard spacecraft.

iss071e414653 (Aug. 1, 2024) --- NASA astronaut and Expedition 71 Flight Engineer Jeanette Epps processes blood and saliva samples aboard the International Space Station's Harmony module. She stowed the specimens in a science freezer and the Kubik research incubator for future retrieval and later analysis. The weightless environment of the orbital outpost allows investigators to explore how living in space long term affects humans and gain insights not possible in Earth’s gravity conditions.

NASA Deputy Administrator Pam Melroy, Bob Cabana, NASA associate administrator, and NASA Administrator Bill Nelson, speak with the 2021 astronaut candidate class, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA Deputy Administrator Pam Melroy, second from left, Bob Cabana, NASA associate administrator, and NASA Administrator Bill Nelson, speak with the 2021 astronaut candidate class, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA Deputy Administrator Pam Melroy, left, Bob Cabana, NASA associate administrator, and NASA Administrator Bill Nelson, speak with the 2021 astronaut candidate class, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Bill Nelson, second from right, Bob Cabana, NASA associate administrator, and NASA Deputy Administrator Pam Melroy speak with the 2021 astronaut candidate class, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

iss071e403704 (July 24, 2024) --- NASA astronauts (from left) Tracy C. Dyson, Expedition 71 Flight Engineer, and Suni Williams, Pilot for Boeing's Crew Flight Test, work inside the NanoRacks Bishop airlock located in the port side of the International Space Station's Tranquility module. The duo installed the the ArgUS Mission-1 technology demonstration hardware inside Bishop for placement outside in the vacuum of space to test the external operations of communications, computer processing, and high-definition video gear.

NASA astronaut Drew Feustel poses for a photo with the NASA Human Exploration and Operations team just after speaking about his experience on two space shuttle missions, STS-125 and STS-134, and a long duration mission onboard the International Space Station at NASA Headquarters, Thursday, May 9, 2019 in Washington, DC. Feustel most recently spent 197 days living and working onboard the International Space Station as part of Expedition 55 and as commander of Expedition 56. Feustel ventured outside the space station on three spacewalks, moving him up to second among U.S. spacewalkers with a cumulative time of 61 hours 48 minutes over nine spacewalks. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Bill Nelson speaks with NASA’s SpaceX Crew-2 ESA (European Space Agency) astronaut Thomas Pesquet during a meeting with fellow NASA astronauts Megan McArthur and Shane Kimbrough, Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide, NASA Deputy Administrator Pam Melroy, and NASA Associate Administrator Bob Cabana, Monday, June 6, 2022, at the Mary W. Jackson NASA Headquarters Building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut candidate Christina Birch, left, and UAE (United Arab Emirates) astronaut candidates Mohammed Al Mulla and Nora Al Matrooshi are seen during a meeting with NASA Administrator Bill Nelson, NASA Deputy Administrator Pam Melroy, and Bob Cabana, NASA associate administrator, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

From left to right, NASA Administrator, Bill Nelson, NASA Deputy Administrator, Pam Melroy, and NASA’s SpaceX Crew-4 NASA astronaut Kjell Lindgren are seen during a meeting, Monday, March 27, 2023, at the Mary W. Jackson NASA Headquarters building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)

jsc2024e035671 (May 17, 2024) --- NASA astronaut and Soyuz MS-27 crew member Jonny Kim completes spacewalk preparation training inside the International Space Station mockup at Johnson Space Center with astronauts Zena Cardman, Stephanie Wilson, and Nick Hague and cosmonaut Aleksandr Gorbunov.

jsc2024e055523 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e055545 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e055570 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e067936 (Oct. 9, 2024) --- NASA astronaut Jonny Kim completing Emergency Scene Joint Crew 2 Training at the Space Vehicle Mockup Facility in Houston, Texas.

jsc2023e080760 (Dec. 15, 2023) --- NASA astronaut Mike Fincke conducts training for a spacewalk at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Bill Stafford

jsc2025e005132 (Jan. 29, 2025) --- NASA astronaut Mike Fincke is photographed during an interview at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e022261_alt2 (March 22, 2024) --- NASA astronaut Zena Cardman poses for a portrait in a photography studio at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2025e005133 (Jan. 29, 2025) --- NASA astronaut Mike Fincke is photographed during an interview at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

jsc2024e022261_alt (March 22, 2024) --- NASA astronaut Zena Cardman poses for a portrait in a photography studio at NASA’s Johnson Space Center in Houston, Texas. Credit: NASA/Josh Valcarcel

From left to right, NASA Associate Administrator Bob Cabana, NASA Deputy Administrator, Pam Melroy, and NASA Administrator Bill Nelson receive signed montages from NASA’s SpaceX Crew-4 NASA astronauts Kjell Lindgren, right, Jessica Watkins, and Robert Hines, Monday, March 27, 2023, at the Mary W. Jackson NASA Headquarters building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Mark Vande Hei speaks with students during a visit to Amidon-Bowen Elementary School with Expedition 66 crewmates NASA astronauts Raja Chari, Kayla Barron, Tom Marshburn and NASA Administrator Bill Nelson, Thursday, Dec. 8, 2022, in Washington. Vande Hei spent 355 days in space as a member of Expedition 65/66 and was joined during Expedition 66 by Marshburn, Chari, and Barron who spent 177 days onboard the International Space Station. Photo Credit: (NASA/Keegan Barber)

From left to right, NASA Deputy Administrator Pam Melroy, NASA’s SpaceX Crew-2 Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide, NASA Associate Administrator Bob Cabana, and NASA Administrator Bill Nelson, are seen during a meeting with fellow Crew-2 members, ESA (European Space Agency) astronaut Thomas Pesquet and NASA astronauts Megan McArthur and Shane Kimbrough, Monday, June 6, 2022, at the Mary W. Jackson NASA Headquarters Building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut candidates Marcos Berríos, left, Deniz Burnham, center, and Jack Hathaway, right, are seen during a meeting with NASA Administrator Bill Nelson, NASA Deputy Administrator Pam Melroy, and Bob Cabana, NASA associate administrator, Wednesday, Oct. 18, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Upon completion of two years of training they could be assigned to missions that involve performing research aboard the International Space Station, launching from American soil on spacecraft built by commercial companies, as well as deep space missions to destinations including the Moon on NASA’s Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/Joel Kowsky)

NASA’s SpaceX Crew-2 astronaut Shane Kimbrough, left. speaks with NASA Associate Administrator Bob Cabana, after a meeting with NASA Administrator Bill Nelson, NASA Deputy Administrator Pam Melroy, and fellow crew members ESA (European Space Agency) astronaut Thomas Pesquet, NASA astronaut Megan McArthur, and Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide, Monday, June 6, 2022, at the Mary W. Jackson NASA Headquarters Building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)

This illustration shows NASA astronauts working on the surface of Mars. A helicopter similar to the Ingenuity Mars Helicopter is airborne at left. Ingenuity is being carried aboard the Perseverance rover; it will be deployed to the Martian surface in the weeks after landing to test whether future helicopters could accompany robotic and human missions. https://photojournal.jpl.nasa.gov/catalog/PIA24032

Astronauts Stuart A. Roosa, and Alfred M. Worden training a tRendezvous Docking Simulator NASA Langley. Worden was one of the 19 astronauts selected by NASA in April 1966. He served as a member of the astronaut support crew for the Apollo 9 flight and as backup command module pilot for the Apollo 12 flight. Colonel Roosa was one of the 19 astronauts selected by NASA in April 1966. He was a member of the astronaut support crew for the Apollo 9 flight.

Astronauts Stuart A. Roosa, and Alfred M. Worden training a tRendezvous Docking Simulator NASA Langley. Worden was one of the 19 astronauts selected by NASA in April 1966. He served as a member of the astronaut support crew for the Apollo 9 flight and as backup command module pilot for the Apollo 12 flight. Colonel Roosa was one of the 19 astronauts selected by NASA in April 1966. He was a member of the astronaut support crew for the Apollo 9 flight.

NASA’s SpaceX Crew-2 astronaut Shane Kimbrough signs a montage for NASA Deputy Administrator Pam Melroy while fellow Crew-2 members look on, Monday, June 6, 2022, at the Mary W. Jackson NASA Headquarters Building in Washington DC. Photo Credit: (NASA/Aubrey Gemignani)