The Government has offered Australia's three mobile operators, and vividwireless, renewal of their existing spectrum allocated on 15 year licences in the late 90s and early 2000s at set prices, while the Government expects to rake in $3 billion.
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William Atkins
Friday, 07 March 2008 19:55
With this important discovery, Rhea will now be studied in great detail by astronomers in order to learn more about its rings.
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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