Gerhard Thiele wait to greet the crew of space shuttle Discovery they exit the crew transport vehicle.

At NASA's Kennedy Space Center, NASA Administrator Mike Griffin, Associate Administrator for NASA Space Operations William Gerstenmaier and European Space Agency astronaut Gerhard Thiele wait to greet the crew of space shuttle Discovery when they exit the crew transport vehicle. Discovery completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA//Kim Shiflett