Endeavour leaves the Vehicle Assembly Building traveling at less than 1 mph atop a transporter.

Shortly before midnight Sept. 18, space shuttle Endeavour leaves the Vehicle Assembly Building at NASA’s Kennedy Space Center, traveling at less than 1 mph atop a massive crawler-transporter. Endeavour sits on the mobile launcher platform with the crawler-transporter underneath. First motion was at 11:15 p.m. Sept. 18. Endeavour completed the 4.2-mile journey to Launch Pad 39B on Sept. 19 at 6:59 a.m. EDT. For the first time since July 2001, two shuttles are on the launch pads at the same time at the center. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission to repair NASA's Hubble Space Telescope, targeted to launch Oct. 10. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for the STS-126 mission to the International Space Station. That flight is targeted for launch Nov. 12. Photo credit: NASA/Dimitri Gerondidakis