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CAPE CANAVERAL, Fla. - Space shuttle Endeavour rolls onto Launch Pad 39B at NASA'S Kennedy Space Center. The crawler-transporter is straddling the flame trench below. At left of the shuttle is the open rotating service structure with the payload changeout room revealed. First motion out of the Vehicle Assembly Building 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