NASAs first all-female spacewalk has been rescheduled for Thursday or Friday morning, the space agency announced today.

Astronauts Christina Koch and Jessica Meir had been scheduled to make the excursion from the International Space Station on Oct. 21, but NASA changed the date so that they could make an urgent repair to the stations power system.

"@Space_Station update: our first all-female spacewalk with @Astro_Christina and @Astro_Jessica will be Thursday or Friday to replace a faulty battery charge-discharge unit," NASA chief Jim Bridenstine said Tuesday on Twitter.

The spacewalk is now scheduled to begin at 7:50 a.m. ET on either Thursday or Friday. NASA will live-stream the outing beginning at 6:30 a.m. ET.

The astronauts will replace a battery charge/discharge unit that failed Oct. 11, after new lithium-ion batteries were installed during a previous spacewalk. The malfunction hasnt jeopardized the safety of the crew, the space station or any of the onboard experiments, according to NASA.

The all-female spacewalk will be the second of what NASA has called a spacewalk bonanza, with 10 outings scheduled through December. Three other spacewalks that had been planned for this week and next week have been postponed, according to the agency.

Originally, NASA had planned an all-female spacewalk in March. But that outing which was to have involved Koch and NASA astronaut Anne McClain was scrapped because there werent enough spacesuits of the right size available on the station.

NASA caught flak for the circumstances surrounding that cancellation. "Gotta love the irony that because women have never spacewalked together before there aren't enough suits so the spacewalk can't happen," one Twitter user said at the time. "What a joke."

This will be Meirs first spacewalk and Kochs fourth.

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Denise Chow is a reporter and editor at NBC News MACH.

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NASA's first all-female spacewalk will now take place this week - NBC News