NASA's 16 women astronauts -- at least one likely to walk on moon(16 images)

Of the 16 women in NASA's astronaut ranks, one of them is likely to be chosen as the first woman to walk on the moon as early as 2024. The selection probably won't be made for some time, but one or more of these women will make history more than half a century after the first men walked on the moon.

Tracy Caldwell 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
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