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Vote Now! Top Space Stories of the Week - Sept. 11, 2011

NASA Launches Moon Gravity Mission

NASA/Darrell McCall

Two identical space probes are on their way to the moon, after launching Friday (Sept. 10) on NASA's newest lunar science mission aimed at unlocking mysteries of the moon that are hidden beneath its surface. The twin Grail moon gravity probes launched atop the last Delta 2 rocket ever to lift off from Cape Canaveral Air Force Station in Florida. [Full Story]

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