STS-121
NASA launches Space Shuttle Discovery for the first time in nearly a year for a second “Return to Flight” mission to the International Space Station, testing more safety procedures and new materials developed since the July 2005 flight (which still required repairs to be conducted in orbit). Aboard Discovery are Commander Steven Lindsey, Pilot Mark Kelly, and mission specialists Stephanie Wilson, Michael Fossum, Piers Sellers, Thomas Reiter and Lisa Nowak. Reiter remains aboard the station, bumping its crew up to three people for the first time since 2003.