EARTH Aboard the Space Shuttle Discovery -- 15 Jul 2006 -- Backdropped by a cloud-covered Earth, the International Space Station moves away from Space Shuttle Discovery. Earlier the STS-121 and Expedition 13 crews concluded almost nine days of cooperative work onboard the shuttle and station. Undocking of the two spacecraft occurred at 5:08 a.m. (CDT) on 15 July, 2006 -- Picture by Lightroom Photos / NASA