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CAPE CANAVERAL, Fla. - The STS-125 crew gets instructions about using the slidewire basket for emergency escape from the 195-foot level of the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida. From left (suited) are Mission Specialist Megan McArthur, Commander Scott Altman, Pilot Gregory C. Johnson and Mission Specialist Mike Massimino. At right are Mission Specialists John Grunsfeld and Andrew Feustel. The crew is at Kennedy to take part in terminal countdown demonstration test, or TCDT, activities before launching on space shuttle Atlantis’ mission to service NASA’s Hubble Space Telescope. TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. Atlantis is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett