Wednesday, April 23
(Undated) -- Crews aboard the International Space Station are sending a Russian supply ship away from the station for tests before it redocks Friday. The space freighter undocked this morning and was scheduled to go about 300 miles away from the ISS. Russian flight controllers are trying out an automated rendezvous system on the cargo ship. Also this morning spacewalkers Steve Swanson and Rick Mastracchio plan to step outside to put in a spare backup computer. The spacewalk will last about two and a half hours.