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Music.

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Space shuttle Discovery met its next major milestone for the upcoming STS-131 mission.

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Just before midnight March 2, the doors of 
the gigantic Vehicle Assembly Building at 
NASA's Kennedy Space

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Center in Florida opened to reveal space shuttle Discovery secured on its mobile launcher platform.

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The massive crawler-transporter, positioned under the platform, moved the shuttle stack out of the VAB headed for Launch Pad 39A.

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It took the powerful transporter about six hours to carefully roll Discovery,

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its external fuel tank and twin solid rocket boosters to the pad at a steady pace of about one mile an hour.

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The 3.4-mile trek to the seaside launch complex was completed when Discovery was secured or

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"hard down" on the pad at about 7 the next morning.

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Now poised for liftoff in April, Discovery's 
seven-member crew is preparing to deliver a multi-purpose

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logistics module filled with science racks to 
the International Space Station.