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NASA launches twin probes to unravel moons core


11:53, September 11, 2011

Near-identical twins Grail-A and Grail-B -- short for Gravity Recovery and Interior Laboratory -- blast off at 9:08 a.m. EDT (1308 GMT) aboard a Delta II heavy rocket from Cape Canaveral Air Force Station in central Florida. The U.S. space agency NASA launched a new, nearly-half-billion-U.S.-dollar lunar mission on Saturday morning that will enable scientists to better understand the moon's gravitational field and the lunar interior. (Xinhua/AFP Photo)

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