This morning, two astronauts will spacewalk on the outside of the International Space Station, in order to replace the vehicle’s aging nickel-hydrogen batteries with newer lithium-ion ones. NASA astronauts Anne McClain and Nick Hague are set to work for 6.5 hours today on the ISS’s exterior.

from https://www.theverge.com/2019/3/22/18276996/nasa-iss-spacewalk-lithium-ion-batteries-anne-mcclain-nick-hague-watch
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