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Music.

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Space shuttle Endeavour left the Vehicle Assembly Building in the middle of the night on April 17

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on what is to be the last trip by a shuttle to NASA Kennedy Space Center's Launch Pad 39B.

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Secured by eight bolts to a launch platform NASA calls a mobile launcher,

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Endeavour was pointed to the sky as a 
crawler-transporter moved it about

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four miles over a track built to support the crawler's immense weight.

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Atlantis is poised on Launch Pad 39A awaiting a targeted May liftoff on a flight to service NASA's Hubble Space Telescope.

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Endeavour will stand by on its launch pad in 
case it is needed for an unlikely

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rescue mission if Atlantis suffers a problem in space.

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