FILE - This May 23, 2010 image provided by NASA shows the International Space Station with the Earth in the background made from the space shuttle Atlantis after undocking. On Wednesday, Jan. 8, 2014, NASA said the White House was poised to announce an extension of the space station's lifetime until at least 2024. The previous end-of-life date was 2020. (AP Photo/NASA)
Two astronauts are preparing to take a spacewalk at the International Space Station Wednesday.
NASA says Steve Swanson and Rick Mastracchio will conduct a two-and-a-half hour spacewalk to install a spare backup computer.
The ISS crew is also preparing to send off a Russian space freighter for two days of testing before re-docking on Friday.