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Unformatted text preview: This reduced the mass of the proto-planets, which weakened their gravity even more, which made it even EASIER for light elements to escape. What was left behind was a small amount of very dense elements and molecules mostly rocks and metals like nickel and iron. The outer planets were much cooler, so the molecular velocity of light elements was much less than the escape velocity. Since most of the material in the early solar system was hydrogen and helium (like the Sun itself), the outer planets held onto this material, and are mostly gaseous hydrogen and helium today....
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This note was uploaded on 07/26/2011 for the course AST 2037 taught by Professor Eikenberry during the Fall '08 term at University of Florida.
- Fall '08