Moon countdown: Hours until 1st NASA probe arrives

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NASA’s last moonshot occurred in 2009 with the launch of a pair of spacecraft _ one that circled the moon and another that deliberately crashed into the surface and uncovered frozen water in one of the permanently shadowed lunar craters.

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Online:

Mission: http://grail.nasa.gov

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Follow Alicia Chang’s coverage at http://www.twitter.com/SciWriAlicia

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