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Countdown starts for UA-led asteroid mission

( —With OSIRIS-REx, the first spacecraft destined to return a sample from a primitive asteroid, still taking shape, the mission's University of Arizona-led team started the official countdown clock on Monday at ...

dateDec 11, 2013 in Space Exploration
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Weighing the Antarctic ice sheet

One of the last big unknowns in the global climate equation is Antarctica. How stable is the Antarctic ice sheet? More than a mile thick, on average, it locks up 70 percent of the Earth's fresh water.

dateSep 27, 2013 in Earth Sciences
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