NASA astronauts Chris Cassidy and Bob Behnken step out of the International Space Station for a spacewalk.
NASA astronauts are heading out to do a seven-hour #spacewalk to replace aging batteries outside of the International Space Station.
The spacewalking astronauts will replace aging nickel-hydrogen batteries for one of two power channels on the far starboard truss (S6 Truss) of the station with new lithium-ion batteries that arrived to the station on a Japanese cargo shiplast month. The battery replacement work is the culmination of power upgrade spacewalks that began in January 2017.
Cassidy will be extravehicular crew member 1 for both spacewalks, wearing the spacesuit with red stripes, while Behnken will be extravehicular crew member 2, wearing the spacesuit with no stripes. It will be the seventh and eighth spacewalks for each astronaut. The spacewalks will be the 228th and 229th in support of space station assembly, maintenance and upgrades.