Science Oct 17

NASA astronaut Christina Koch (right) poses for a portrait with fellow Expedition 61 Flight Engineer Jessica Meir of NASA who is inside a U.S. spacesuit for a fit check. Photo and caption by NASA
WATCH: NASA conducts 1st all-female spacewalk

As NASA astronauts Christina Koch and Jessica Meir completed the job with wrenches, screwdrivers and power-grip tools, it marked the first time in a half-century of spacewalking that men weren't part of the action.

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