10:08:09 Asteroids, comets

10:08:09 Asteroids, comets - from merging together Comets...

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Asteroids, Comets,  08/10/2009 08:30:00 Asteroids Small, rocky objects in orbit around the Sun 250,000 currently have designations o so many small ones to large ones But total mass probably less than the Moon The Asteroid Belt o Between orbits of Mars and Jupiter o Includes most known asteroids o Mostly orbiting Sun in same direction of planets, and in plane of solar  system. o Why is it where it is? Rocky planetesimals survived between Jupiter and Mars  because they did not merge together into a planet Jupiter’s gravity stirred up orbits, and therefore prevent them 
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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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This note was uploaded on 10/17/2011 for the course ISP 205 taught by Professor Donahue during the Fall '08 term at Michigan State University.

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10:08:09 Asteroids, comets - from merging together Comets...

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