Former NASA astronaut Bob Curbeam spoke about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA astronauts Doug Wheelock, left, Alvin Drew, second from right, Jeanette Epps, right, and former astronauts Janet Kavandi, second from left, and Bob Curbeam, center, spoke about their time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA astronauts Jeanette Epps, left, Alvin Drew, second from left, Doug Wheelock, right, and former astronauts Bob Curbeam, center, and Janet Kavandi, second from right, spoke about their time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

A student asks a panel of NASA astronauts including Doug Wheelock, Alvin Drew, Jeanette Epps, and former astronauts Janet Kavandi, and Bob Curbeam, a question about their time in space at a STEM day session during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

A student asks a panel of NASA astronauts including Doug Wheelock, Alvin Drew, Jeanette Epps, and former astronauts Janet Kavandi, and Bob Curbeam, a question about their time in space at a STEM day session during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA astronaut Alvin Drew, right, spoke about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA astronaut Jeanette Epps, right, spoke about her time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)