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KENNEDY SPACE CENTER, FLA. - For the second time in two days, the STS-121 crew heads for the Astrovan to take them to Launch Pad 39B and launch of Space Shuttle Discovery. On the left side, from left, are Mission Specialists Stephanie Wilson and Lisa Nowak, and Pilot Mark Kelly. On the right side, left to right, are Mission Specialists Thomas Reiter, Piers Sellers and Michael Fossum, and Commander Steven Lindsey. The first launch attempt July 1 was scrubbed due to weather concerns and postponed 24 hours. The launch is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett