SpaceX rocket Falcon 9 at Cape Canaveral in Florida was scheduled to launch Saturday morning, but aborted just before liftoff. Roberto Gonzalez/Getty Images hide caption

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A composite of Lyrids over Huntsville, Ala., in 2009. This year, the meteor shower will hit its peak before dawn Sunday morning. Danielle Moser/MSFC/NASA hide caption

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Discovery is sitting atop NASA's 747 Shuttle Carrier Aircraft, which will fly the shuttle from Florida to Virginia. Roberto Gonzalez/Getty Images hide caption

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The Warp in this Spiral Galaxy was probably the result of a cosmic collision with another galaxy. Hubble Heritage Team (STScI/AURA), C. Conselice (U. Wisconsin/STScI) et al., NASA hide caption

toggle caption Hubble Heritage Team (STScI/AURA), C. Conselice (U. Wisconsin/STScI) et al., NASA

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