Welcome to NASA's STS-125 Launch Blog
Live countdown coverage will begin about six hours before liftoff of space shuttle Atlantis.
Stay with us on launch day as the exciting final hours before liftoff of Atlantis unfold. Through blog updates and videos, keep track of preparations at the launch pad and follow the astronauts as they suit up in crew quarters, travel to the launch pad on NASA's Astrovan, and strap in their seats to await liftoff and the beginning of mission STS-125.