July 24, 2009
Astronauts swap old batteries for new
Astronauts Chris Cassidy and Tom Marshburn Friday replaced the first of four 375-pound batteries in a spacewalk that could take nearly eight hours, NASA said.
The replacement mission was cut short Wednesday after carbon dioxide levels rose in Cassidy's suit. The lithium hydroxide canister that scrubs carbon dioxide from the suit was replaced for Friday's walk, NASA officials said in a release.
The International Space Station is powered by a photovoltaic system that gathers solar power and stores it in the Port 6 batteries.
The astronauts aboard the station were awakened Friday at 5:03 a.m. EDT by Pink Floyd's song
Wish You Were Here.