5 April 2010 --- After suiting up, the STS-131 crew members pause alongside the Astrovan to wave farewell to onlookers before heading for launch pad 39A...

5 April 2010 --- After suiting up, the STS-131 crew members pause alongside the Astrovan to wave farewell to onlookers before heading for launch pad 39A for the launch of space shuttle Discovery on the STS-131 mission. From the right are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Rick Mastracchio, Dorothy Metcalf-Lindenburger, Stephanie Wilson, Japan Aerospace Exploration Agency (JAXA) astronaut Naoko Yamazaki and NASA astronaut Clayton Anderson, all mission specialists. Liftoff of the STS-131 mission is set for 6:21 a.m. (EDT) on April 5. On STS-131, 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 structure, 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.