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KENNEDY SPACE CENTER, FLA. -- At the Operations and Checkout Building, the crew members of space shuttle mission STS-120 prepare to board the bus that will transport them to Launch Pad 39A during their terminal countdown demonstration test activities. In the left row are, from front, Pilot George Zamka and Mission Specialists Stephanie Wilson, Daniel Tani, and Scott Parazynski. In the right row are, from front, Commander Pam Melroy and Mission Specialists Doug Wheelock and Paolo Nespoli. Nespoli represents the European Space Agency. After the mission, Tani will remain aboard the International Space Station and return with the STS-122 crew, targeted to launch Dec. 6. The terminal countdown demonstration test 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 ISS. Discovery's launch is targeted for Oct. 23 at 11:38 a.m. EDT on a 14-day mission. Photo credit: NASA/Kim Shiflett