On a ring origin of the equatorial ridge of Iapetus |
On a ring origin of the equatorial ridge of Iapetus |
Guest_AlexBlackwell_* |
Aug 29 2006, 06:18 PM
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Guests |
Wing Ip just had an interesting Iapetus-related paper published in GRL.
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Sep 7 2006, 02:58 PM
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Some of the criteria that seem to be needed for us to see such a feature are
*ancient surface *object needs to approximate a sphere *object may need to be remote from other objects (our own moon does not seem to have low circular orbits stable enough for there to be enough time for a ring system to form and emplace. Materials in randomly inclined lunar orbits will contact the lunar surface prior to colapse to the Laplacian plane) *object needs to have a surface sufficiently solid and rigid for the materials to emplace on *object needs a very low density (prefer none) atmosphere or materials will drop all around the equator. (we may see such structures someday, but they won't look like the Iapetan ridge formation). *object needs to be somewhere an appropriate glancing impact can loft materials is likely to occur. Iapetus may have encountered an 'outie' satellite of Saturn or a displaced Saturnian Trojan object |
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