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CAPE CANAVERAL, Fla. - The STS-125 crew listens to instructions about emergency escape procedures from the shuttle. They are on the 195-foot level of the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida. From left (suited in blue uniforms) are Commander Scott Altman, Mission Specialists John Grunsfeld and Michael Good, Pilot Gregory C. Johnson, and Mission Specialists Andrew Feustel, Megan McArthur and Mike Massimino. 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