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Unformatted text preview: , and later had their atmospheres blasted away by radiation from a nearby massive OB star .  An alternative concept is that they formed closer to the Sun, where the matter density was higher, and then subsequently migrated to their current orbits after the removal of the gaseous protoplanetary disc.  This hypothesis of migration after formation is currently favoured, due to its ability to better explain the occupancy of the populations of small objects observed in the trans-Neptunian region.  The current most widely accepted    explanation of the details of this hypothesis is known as the Nice model , which explores the effect of a migrating Neptune and the other giant planets on the structure of the Kuiper belt...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10