NASA Shuttle Launches (70 images)

Astronauts Rick Linnehan and Mike Foreman, both STS-123 mission specialists, participate in the second scheduled session of extravehicular activity (EVA) for construction and maintenance on the International Space Station. During the 7-hour, 8-minute spacewalk, Linnehan and Foreman, assembled the Dextre robotic arm. (UPI Photo/NASA)

Mission specialist and teacher Barbara R. Morgan answers questions during the STS-118 post flight crew press conference at Kennedy Space Center, Florida on August 21, 2007. Morgan and the rest of STS-118 crew members landed on board the Space Shuttle Endeavour earlier today. (UPI Photo/Bill Ingalls/NASA)

Mission Specialist Barbara Morgan makes her way to Launch Complex 39A to board NASA's Space Shuttle Endeavour for mission STS-118 at the Kennedy Space Center, Florida on August 8, 2007. The Endeavour's seven person crew, including teacher/astronaut Barbara Morgan, is on an 11 day service mission to the International Space Station This is the first mission for the Shuttle since 2002. (UPI Photo/Joe Marino-Bill Cantrell)

STS-118 mission specialist astronaut/teacher Barbara R. Morgan looks over procedures checklists on the middeck of Space Shuttle Endeavour while docked with the International Space Station on August 15, 2007. (UPI Photo/NASA)