Photos: Atlantis - the last space shuttle
Space Shuttle
Credit: AP
In this image provided by NASA television a fire can be seen at the end of the flare stack that vents the hydrogen portion of the external fuel tank as fueling operations continue for Space Shuttle Atlantic early Friday July 8, 2011. The vented hydrogen is normally burned but the flame is rarely seen. Atlantis is on schedule for liftoff Friday although weather continues to threaten to delay the launch. (AP Photo/NASA
