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Download Cassini at Saturn. Huygens Results by David M. Harland PDF

By David M. Harland

While pacecraft flew in the course of the Saturian approach within the years 1979, 1980 and 1981, the consequences have been astronishing. The satellits have been eventually proven to be miniature worlds in there personal correct.

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Extra info for Cassini at Saturn. Huygens Results

Sample text

Titius of Wittenberg noted in 1766 that there was a consistent progression in the sizes of the orbits of the planets. 1). E. Bode of Berlin, reviving Kepler's thesis, proposed that there must indeed be an as yet undiscovered planet corresponding to this gap in what became known as the Titius± Bode `law'. X. H. SchroÈter's observatory in Lilienthal of a few friends who shared an interest in searching for this `missing' planet. It was agreed that the object would probably lie near the ecliptic, so letters would be sent to colleagues urging that over the coming year they methodically search a series of zones of sky in an effort to locate it.

E. Barnard made the first observation of Iapetus passing through the shadow of the `C' ring. Using Tethys and Enceladus as references, he composed this light curve of Iapetus's brightness. The lure of the rings 25 Despite Maxwell's dismissal of fine structure as inconsequential `density waves' crossing the surface of the ring system, some observers continued to record their appearance. Sidney Coolidge at the Harvard College Observatory noted four or five narrow lines on the `B' ring on 20 March 1856, and Asaph Hall suspected the presence of lines on the `B' ring while using the 26-inch Alvan Clark refractor of the US Naval Observatory in Washington on several occasions in 1875 and 1876.

Others, however, interpreted Roche's calculations as supporting the analogy with the `nebular hypothesis', by providing a rationale for why the rings were inhibited from coalescing to form a satellite. Mimas, the closest of the moons, lies just outside the Roche radius, and so has every reason to exist as a coherent body. C. Bond, perceived with the Harvard College Observatory's 15-inch refractor a dusky inner ring which extended half way in towards the planet as a continuation of the `B' ring.

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