Two Nasa astronauts are making the first-ever all-female spacewalk. Christina Koch and Jessica Meir left the International Space Station's Quest airlock on Friday to replace a failed power control unit -reports BBC.
They were expected to spend five and a half hours replacing the power regulator with a spare.
Ms. Koch had already carried out four spacewalks but it was the first for MS Meir, who became the 15th woman to walk in space, Nasa said.
