The crew members prepare to speak to the media at the Shuttle Landing Facility at NASA's Kennedy Space Center.

The STS-125 crew members prepare to speak to the media at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida after arriving in T-38 jets for Terminal Countdown Demonstration Test, or TCDT, activities. From left are, mission specialist Megan McArthur, pilot Gregory C. Johnson, mission specialist Mike Massimino, commander Scott Altman, and mission specialists Andrew Feustel, John Grunsfeld and Michael Good. During TCDT, space shuttle Atlantis’ STS-125 crew members will participate in a simulated launch countdown, practice emergency egress procedures at the launch pad and continue to familiarize themselves with the mission payload and hardware. STS-125 is the fifth and final shuttle Hubble Space Telescope servicing mission. Launch is targeted for Oct. 10. Photo credit: NASA/Kim Shiflett