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alexblackwell
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<b>Wandering Gas Giants and Lunar Bombardment</b><br /><br />--- Outward migration of Saturn might have triggered a dramatic increase in the bombardment rate on the Moon 3.9 billion years ago, an idea testable with lunar samples. <br /><br /><b><i>Written by G. Jeffrey Taylor</i></b><br />Hawai'i Institute of Geophysics and Planetology<br />posted August 24, 2006