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View Full Version : Sedna Untouched for Millions of Years



Fraser
2005-Sep-07, 06:26 AM
SUMMARY: Most objects in the Solar System have been resurfaced by collisions with asteroids, smaller rocks and comets. But Sedna, on the other hand, has spent its lifetime in the remote reaches of the Solar System, and probably hasn't had many impacts at all. It's only been weathered by cosmic rays and solar ultraviolet radiation. Astronomers think that Sedna started out icy, like Pluto and Charon, but was then baked for millennia, until the ice was transformed into a complex hydrocarbon similar to asphalt.

View full article (http://www.universetoday.com/am/publish/sedna_untouched_millions.html)
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