NASA Astronauts Christina Koch and Jessica Meir Perform First All-Female Spacewalk
NASA astronaut Christina Koch takes an out-of-this-world "space-selfie" with the Earth behind her on October 18, 2019. She and fellow NASA astronaut Jessica Meir (out of frame) ventured into the vacuum of space for seven hours and 17 minutes to swap a failed battery charge-discharge unit (BCDU) with a spare during the first all-woman spacewalk. The BCDU regulates the charge to the batteries that collect and distribute solar power to the orbiting lab's systems. NASA/UPI
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