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read moreRings around Rhea: Possible first time discovery
William Atkins
Friday, 07 March 2008 18:55
The scientists are not sure yet what formed the rings, but have several theories. One theory is that they formed when a comet or asteroid collided with Rhea.
The Jones team discovery is published online in Science, beginning on Friday, March 7, 2008. The title of their paper is “The Dust Halo of Saturn's Largest Icy Moon, Rhea” (vol. 319. no. 5868, pp. 1380-1384).
The summary of their paper states, “Saturn's moon Rhea had been considered massive enough to retain a thin, externally generated atmosphere capable of locally affecting Saturn's magnetosphere. The Cassini spacecraft's in situ observations reveal that energetic electrons are depleted in the moon's vicinity. The absence of a substantial exosphere implies that Rhea's magnetospheric interaction region, rather than being exclusively induced by sputtered gas and its products, likely contains solid material that can absorb magnetospheric particles. Combined observations from several instruments suggest that this material is in the form of grains and boulders up to several decimetres in size and orbits Rhea as an equatorial debris disk. Within this disk may reside denser, discrete rings or arcs of material.”
Addition information on the Cassini/Huygens mission is available at: http://www.nasa.gov/cassini and http://saturn.jpl.nasa.gov.
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