Study: Asteroids show signs of aging

U.S. space scientists say they've determined asteroids show varying signs of aging -- a vital clue to the origin of meteorites.

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<p><a href="http://www.physorg.com/news76778511.html">Study: Asteroids show signs of aging</a></p> <p>U.S. space scientists say they've determined asteroids show varying signs of aging -- a vital clue to the origin of meteorites.</p>