STS-121 Mission Specialist Stephanie Wilson is donning her launch suit for another launch attempt on Space Shuttle Discovery.

For the second time in two days, STS-121 Mission Specialist Stephanie Wilson is donning her launch suit for another launch attempt on Space Shuttle Discovery. 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