NASA Deputy Associate Administrator for Exploration, Steve Clarke speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Clarke, NASA Administrator Jim Bridenstine, and NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Associate Administrator for Exploration, Steve Clarke speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Clarke, NASA Administrator Jim Bridenstine, and NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

Steve Clarke, Deputy Associate Administrator for Exploration in NASA’s Science Mission Directorate, answers a question from the audience during an interactive STEM discussion with students attending the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019, at NASA Headquarters in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine, left, speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, center, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, right, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, center, speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, NASA Administrator Jim Bridenstine, left, Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

Jody Singer, Director of NASA’s Marshall Space Flight Center, left, Ken Bowersox, acting Associate Administrator for NASA's Human Exploration and Operations Mission Directorate, center, and Steve Clarke, Deputy Associate Administrator for Exploration in NASA’s Science Mission Directorate, right, discuss the agency’s Artemis program during an interactive STEM discussion with students attending the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019, at NASA Headquarters in Washington. Photo Credit: (NASA/Joel Kowsky)

Steve Clarke, Deputy Associate Administrator for Exploration in NASA’s Science Mission Directorate, right, is seen with Ken Bowersox, acting Associate Administrator for NASA's Human Exploration and Operations Mission Directorate, center, and Jody Singer, Director of NASA’s Marshall Space Flight Center, left, during an interactive STEM discussion with students attending the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019, at NASA Headquarters in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA astronaut Tracy Caldwell Dyson, left, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine poses for a photo with college students after the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where they were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, second from left, speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, second from right, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, right, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson, left, moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Tracy Caldwell Dyson, left, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine takes a selfie with college students after the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where they were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

A video profile of a NASA employee is seen as NASA astronaut Tracy Caldwell Dyson, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. The students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, second from left, speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, second from right, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, right, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson, left, moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

Nick Hague and Christina Koch, two astronauts currently living and working on the International Space Station, are seen on the screen during a live uplink and panel discussion with moderator NASA astronaut Tracy Caldwell Dyson, NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Nick Hague, left, and Christina Koch, two astronauts currently living and working on the International Space Station, are seen on the screen during a live uplink and panel discussion with, from left to right, moderator NASA astronaut Tracy Caldwell Dyson, NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Anne Marie Demme asks Nick Hague and Christina Koch, two astronauts currently living and working on the International Space Station, a question during a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. NASA astronaut Tracy Caldwell Dyson, moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

A student asks Nick Hague and Christina Koch, two astronauts currently living and working on the International Space Station, a question during a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. NASA astronaut Tracy Caldwell Dyson, moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

A student asks a questions during a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. NASA astronaut Tracy Caldwell Dyson moderated the discussion. Photo Credit: (NASA/Aubrey Gemignani)

Memorandum of Understanding (MOU) to establish a Unmanned Aerial Vehicles (UAV) Applications Center at NASA Research Park (NRP) was signed into being by (L-R) John Bassett Clark University, Worcester, Mass., Dr. Henry McDonald, Director of Ames Research Center and Paul Coleman, Girvan Institute (a non-profit organization lockated in NASA Research Park). Witnessed by (Back Row, L-R) Steve Douagan, Dave Peterson, Jim Brass, Stan Herwitz, Ken Souza, Estelle Condon, Carolina Blake.

NASA astronaut Tracy Caldwell Dyson speaks with college students after the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. She moderated a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks with college students after the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. NASA astronaut Tracy Caldwell Dyson moderated a panel discussion with Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke. Photo Credit: (NASA/Aubrey Gemignani)

Memorandum of Understanding (MOU) to establish a Unmanned Aerial Vehicles (UAV) Applications Center at NASA Research Park (NRP) was signed into being by (L-R) John Bassett Clark University, Worcester, Mass., Dr. Henry McDonald, Director of Ames Research Center and Paul Coleman, Girvan Institute (a non-profit organization lockated in NASA Research Park). Witnessed by (Back Row, L-R) Steve Douagan, Dave Peterson, Jim Brass, Stan Herwitz, Ken Souza, Estelle Condon, Carolina Blake.

NASA astronaut Tracy Caldwell Dyson, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Gerstenmaier, NASA Administrator Jim Bridenstine, and NASA Deputy Associate Administrator for Exploration, Steve Clarke questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, left, speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, right, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, not pictured, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

Nick Hague, left, and Christina Koch, two astronauts currently living and working on the International Space Station, are seen on the screen during a live uplink and panel discussion with NASA Administrator Jim Bridenstine, center, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, right, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, not pictured, at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. NASA astronaut Tracy Caldwell Dyson, left, moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

Students are seen in the audience as NASA astronaut Tracy Caldwell Dyson, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington. The students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine high fives a college student attending the same university he attended, Rice University, after the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where they were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask panelists, Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke, questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. NASA astronaut Tracy Caldwell Dyson moderated the panel discussion. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Tracy Caldwell Dyson, moderates a panel discussion with NASA Administrator Jim Bridenstine, NASA Associate Administrator for the Human Exploration and Operations Mission Directorate, Bill Gerstenmaier, and NASA Deputy Associate Administrator for Exploration, Steve Clarke at the "Future of Space" STEM event, Monday, April 29, 2019 at NASA Headquarters in Washington, where college students were able to ask the panelists questions as well as speak with two astronauts currently on the International Space Station, Nick Hague and Christina Koch. Photo Credit: (NASA/Aubrey Gemignani)

CAPE CANAVERAL, Fla. - Standing under space shuttle Atlantis at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-129 NASA Test Director Steve Payne, left, discusses the newly completed mission with STS-129 Mission Specialist Mike Foreman, center, and NASA pilot Dick Clark. Atlantis touched down on Runway 33, completing the 4.5-million-mile STS-129 mission on orbit 171. Main gear touchdown was at 9:44:23 a.m. EST. Nose gear touchdown was at 9:44:36 a.m., and wheels stop was at 9:45:05 a.m. On STS-129, the six-member crew delivered 14 tons of cargo to the orbiting laboratory, including two ExPRESS Logistics Carriers containing spare parts to sustain station operations after the shuttles are retired next year. For information on the STS-129 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

S96-18546 (5 Nov. 1996) --- Following their selection from among 2,400 applicants, the 44 astronaut candidates begin a lengthy period of training and evaluation at NASA's Johnson Space Center as they gather for their group portrait. This year?s class is the largest in the history of space shuttle astronauts and their early program predecessors. Ten pilots and 25 mission specialists make up the internationally diverse class. The international trainees represent the Canadian, Japanese, Italian, French, German and European space agencies. Back row ? from the left, Christer Fuglesang, John Herrington, Steve MacLean, Peggy Whitson, Stephen Frick, Duane Carey, Daniel Tani, Heidemarie Stefanyshyn-Piper, Jeffrey Williams and Donald Pettit. Second to back row ? from the left, Philippe Perrin, Daniel Burbank, Michael Massimino, Lee Morin, Piers Sellers, John Phillips, Richard Mastraccio, Christopher Loria, Paul Lockhart, Charles Hobaugh and William McCool. Second to front row ? from the left, Pedro Duque, Soichi Noguchi, Mamoru Mohri, Gerhard Thiele, Mark Polansky, Sandra Magnus, Paul Richards, Yvonne Cagle, James Kelly, Patrick Forrester and David Brown. Front row ? from the left, Umberto Guidoni, Edward Fincke, Stephanie Wilson, Julie Payette, Lisa Nowak, Fernando Caldeiro, Mark Kelly, Laurel Clark, Rex Walheim, Scott Kelly, Joan Higginbotham and Charles Camarda. Guidoni represents the Italian Space Agency (ASI). Fuglesang and Duque represent the European Space Agency (ESA). Mohri and Noguchi represent the Japanese Space Agency (NASDA). MacLean and Payette are with the Canadian Space Agency. Perrin is associated with the French Space Agency (CNES) and Thiele represents the German Space Agency (DARA). Photo credit: NASA or National Aeronautics and Space Administration