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NASA astronauts embark on spacewalk at International Space Station

Posted at 6:26 AM, Mar 22, 2019

A pair of astronauts are embarking on a seven-hour spacewalk Friday, the first spacewalk of 2019.

NASA said flight engineers Nick Hague and Anne McClain are venturing outside the International Space Station's Quest airlock to replace nickel-hydrogen batteries with newer, more powerful lithium-ion batteries on the ISS's orbiting laboratory.

NASA said this spacewalk, the first of three, is part of an overall upgrade of the International Space Station's power system.