In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Mission Specialists Michael Good, Mike Massimino and Andrew Feustel discuss the tiles they are looking at on the underside of space shuttle Atlantis. Crew members are at Kennedy for a crew equipment interface test, which provides hands-on experience with hardware and equipment for their mission. Atlantis is targeted to launch on the STS-125 Hubble Servicing Mission 4 on Oct. 8. Photo credit: NASA/Kim Shiflett