New Rings Of Uranus |
New Rings Of Uranus |
Dec 22 2005, 07:50 PM
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Haven't found an official press release on this but Yahoo has an article up about a few newly discovered rings of Uranus:
http://news.yahoo.com/s/ap/20051222/ap_on_sc/uranus_rings These rings were found between the Epsilon ring and Miranda's orbit. One apparently was found at around 97,000 km, near the orbit of Mab, suggesting that Mab supplies material for the ring. These rings are apparently quite faint, probably why VGR2 missed them. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Apr 7 2006, 03:18 PM
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
- http://www.newscientistspace.com/article/d...rkling-ice.html (Blue ring of Uranus linked to sparkling ice)
--- Before this discovery, the only known blue ring was Saturn's E-ring. It also has a moon orbiting at its heart – Enceladus - which spews out water vapour to generate the E-ring. Mab is surely too small to sustain similar activity, being only 15 kilometres across compared to 500 km for Enceladus. Instead meteorite impacts probably chip ice off the frozen surface to feed the ring. --- Illustration: -------------------- - blue_scape / Nico -
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Apr 7 2006, 03:22 PM
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
Before this discovery, the only known blue ring was Saturn's E-ring. It also has a moon orbiting at its heart – Enceladus - which spews out water vapour to generate the E-ring. Mab is surely too small to sustain similar activity, being only 15 kilometres across compared to 500 km for Enceladus. Instead meteorite impacts probably chip ice off the frozen surface to feed the ring. So why aren't other rings with moons embedded in them also blue? If all that is required are meteorite impacts knocking off moon pieces rather than full-scale geysers, why don't we see more blue rings? Has anyone checked to see if Neptune has any blue rings? Shall I presume that Jupiter does not? -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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