A technician shows a reinforced carbon carbon panel to STS-125 Mission Specialists Mike Massimino left and Mike Good.

In the Orbiter Processing Facility at NASA's Kennedy Space Center, a technician shows a reinforced carbon-carbon panel to STS-125 Mission Specialists Mike Massimino (left) and Mike Good. The RCC panels are part of the thermal protection system used on space shuttles. The crew is at Kennedy for a crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch on the STS-125 Hubble Servicing Mission 4 on Oct. 8. Photo credit: NASA/Kim Shiflett