Astronauts are taking a spacewalk outside their space station today. Watch it live!

NASA astronaut Bob Behnken is pictured during a spacewalk to swap batteries and upgrade power systems on the International Space Station's Starboard-6 truss structure, on June 26, 2020. Behnken was joined during the six-hour and seven-minute excursion by NASA astronaut Chris Cassidy (out of frame).
NASA astronaut Bob Behnken is pictured during a spacewalk to swap batteries and upgrade power systems on the International Space Station's Starboard-6 truss structure, on June 26, 2020. Behnken was joined during the six-hour and seven-minute excursion by NASA astronaut Chris Cassidy (out of frame). (Image credit: NASA)

Two NASA astronauts are venturing outside the International Space Station (opens in new tab) for a spacewalk today (July 1) to finish replacing old batteries on the station's solar arrays. 

Expedition 63 Cmdr. Chris Cassidy and Demo-2 astronaut Bob Behnken (opens in new tab), who arrived at the space station on SpaceX's Crew Dragon (opens in new tab) spacecraft in May, began at 7:13 a.m. EDT (1113 GMT) and will spend up to seven hours working in the vacuum of space. 

You can watch the spacewalk live here on Space.com (opens in new tab), courtesy of NASA TV. You can also watch it at nasa.gov/live (opens in new tab) and on the agency's YouTube (opens in new tab).

Related: The International Space Station: inside and out (infographic) (opens in new tab)

This will be the second spacewalk for Cassidy and Behnken, who completed a 6-hour and 7-minute spacewalk (opens in new tab) together on June 26. During that spacewalk, the duo swapped out three old nickel-hydrogen batteries on the far starboard truss (S6 Truss) of the station for two more efficient lithium-ion batteries. Today, they will swap out one more battery and wrap up power upgrades that began in 2017 (opens in new tab). These batteries are designed to power the station through the end of its planned lifetime in 2024. 

The new lithium-ion batteries that Cassidy and Behnken are installing arrived at the International Space Station on Japan's HTV-9 cargo resupply spacecraft (opens in new tab), which arrived at the station in May.  

Email Hanneke Weitering at hweitering@space.com or follow her @hannekescience. Follow us on Twitter @Spacedotcom and on Facebook.

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Hanneke Weitering is an editor at Space.com with 10 years of experience in science journalism. She has previously written for Scholastic Classroom Magazines, MedPage Today and The Joint Institute for Computational Sciences at Oak Ridge National Laboratory. After studying physics at the University of Tennessee in her hometown of Knoxville, she earned her graduate degree in Science, Health and Environmental Reporting (SHERP) from New York University. Hanneke joined the Space.com team in 2016 as a staff writer and producer, covering topics including spaceflight and astronomy. She currently lives in Seattle, home of the Space Needle, with her cat and two snakes. In her spare time, Hanneke enjoys exploring the Rocky Mountains, basking in nature and looking for dark skies to gaze at the cosmos.