In space shuttle Discovery's payload bay get a close look at the equipment and payloads.

In space shuttle Discovery's payload bay, STS-120 crew members get a close look at the equipment and payloads. Seen here are Mission Specialists Daniel Tani (left) and Scott Parazynski, looking over the Italian-built U.S. Node 2, named Harmony. The TCDT provides astronauts and ground crews an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. The STS-120 mission will deliver the U.S. Node 2 module, named Harmony, aboard space shuttle Discovery to the International Space Station. Launch of Discovery on mission STS-120 is targeted for Oct. 23 at 11:38 a.m. EDT on a 14-day mission. Photo credit: NASA/Kim Shiflett