Space ShuttleNASA launches Space Shuttle Columbia on the 90th shuttle mission, in which 16 days are spent in orbit conducting studies of the human nervous system in a weightless environment. This is the final flight of the 20-year-old Spacelab module aboard a space shuttle, though some elements of Spacelab are later incorporated into the International Space Station. Columbia’s 25th crew is Commander Richard Searfoss, Pilot Scott Altman, and mission specialists Richard Linnehan, Dafydd Rhys Williams and Kathryn Hire, and payload specialists Dr. Jay Buckey and Dr. James Pawelczyk. (The crew, along with backup crewmembers, is pictured here during a visit to the set of Star Trek: Voyager.)