NASA's women astronauts -- at least one likely to walk on moon

Watkins is helped into a spacesuit before underwater spacewalk training at Johnson Space Center on May 22, 2019. She will train for the moon mission. Photo by David DeHoyos/NASA

Barron dons her spacesuit in Houston on July 12, 2019. She will train for the moon mission. Photo by Bill Ingalls/UPI

Rubins prepares for a spacewalk on board the International Space Station on August 10, 2016. She will train for the moon mission. Photo courtesy of NASA

Koch collects and packs Mizuna mustard greens grown and harvested inside the International Space Station's veggie botany facility on November 13, 2019. She will train for the moon mission. Photo courtesy of NASA

Expedition 59 astronaut McClain is helped out of the Soyuz MS-11 spacecraft just minutes after she landed in a remote area near the town of Zhezkazgan, Kazakhstan, on June 25, 2019. She will train for the moon mission. Photo by Bill Ingalls/NASA

Wilson poses for a portrait at Johnson Space Center on July 11, 2019. She will train for the moon mission. Photo by Bill Ingalls/NASA

Meir sits for her portrait in an Extravehicular Mobility Unit, the suit used for spacewalks, on September 11, 2018. She will train for the moon mission. Photo by Josh Valcarcel/NASA

Nicole Aunapu Mann attends the announcement that she was being assigned to the Boeing CST-100 Starliner Crew test flight to the International Space Station on August 3, 2018. Photo Bill Ingalls/NASA

Dyson pauses for a portrait in her spacesuit before going underwater in the Neutral Buoyancy Lab at NASA's Johnson Space Center in Houston on July 8, 2019. Photo by Bill Ingalls/UPI

O'Hara stands in front of a T-38 trainer aircraft at Ellington Field near Johnson Space Center on June 6, 2017. Photo by Robert Markowitz/NASA

Cardman awaits the next steps from instructors during water survival training in Houston on August 23, 2017. Photo by David DeHoyos/NASA

Expedition 32 flight engineer and Expedition 33 commander Williams participates in spacesuit fit check at the Johnson Space Center on September 8, 2011. Photo courtesy of NASA

Epps sits for her portrait on September 30, 2009. Photo by Robert Markowitz/NASA

McArthur poses for a portrait on the Crew Access Arm of the mobile launcher at Kennedy Space Center in Florida on June 25, 2019. Photo by Joel Kowsky/NASA

Walker welcomes viewers at the Johnson Space Center to watch the live coverage of Expedition 40/41 launch as it unfolds at Baikonur, Kazakhstan, on May 28, 2014. Members of the crew can be seen on the nearby screen. Photo courtesy of NASA