CAPE CANAVERAL, Fla. - Space shuttle Discovery clears the tower on Launch Pad 39A at NASA's Kennedy Space Center in Florida, its two solid rocket boosters and three main engines generating nearly seven million pounds of thrust. Liftoff on the STS-131 mission was on time at 6:21 a.m. EDT April 5. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that will be transferred to the International Space Station's laboratories. The crew also will switch out a gyroscope on the station’s truss, install a spare ammonia storage tank and retrieve a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo courtesy of Scott Andrews