WATCH LIVE: Astronauts Embark On First All-Female Spacewalk

Astronauts Christina Koch and Jessica Meir step out of the International Space Station for a second attempt at the first all-female spacewalk. Koch had been scheduled to perform a spacewalk with Anne McClain in March, but it was cancelled because they didn't have the right sizes of spacesuits on the ISS. Koch and Meir will be installing new batteries on the ISS.

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