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The STS-125 crew walks toward the emergency landing area on Launch Pad 39A at NASA's Kennedy Space Center in Florida to greet the media. Leading the way, at right, is Commander Scott Altman. Behind him, right to left, are Pilot Gregory C. Johnson and Mission Specialists Michael Good, Megan McArthur, John Grunsfeld, Mike Massimino 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.