STS121-S-053

Space Shuttle Discovery's main landing gear is about to touch down on runway 15 at Kennedy Space Center's Shuttle Landing Facility at 9:14 a.m. (EDT) on July 17, 2006. Onboard were astronauts Steven W. Lindsey, commander; Mark E. Kelly, pilot; Piers J. Sellers, Michael E. Fossum, Lisa M. Nowak and Stephanie D. Wilson, all mission specialists. During the nearly 13-day mission, the STS-121 crew tested new equipment and procedures to improve shuttle safety, and delivered supplies and made repairs to the International Space Station.