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Unformatted text preview: from merging together Comets Formed beyond frost line, comets are icy counterparts to asteroids Dirty snowball model o Mostly water ice o + other ices o mixed with sand and dust-like particles outer layers on nucleus vaporize when comet approaches sun most comets stay perpetually frozen in outer solar system. Only a few enter inner solar system where they grow tails 08/10/2009 08:30:00 08/10/2009 08:30:00...
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- Fall '08