Invented kinetic theory of gases and the maxwell

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Unformatted text preview: s Rings: Saturn Rings: James Clerk Maxwell James Maxwell invented kinetic theory of gases and the Maxwell theory of electromagnetism theory Maxwell (1857) realized that neither rigid solid nor fluid rings were stable solid Maxwell proposed Saturn’s rings were Maxwell rings many small particles Voyager: Icy snowballs mm to metre size metre Making Rings: Making The Roche Limit There is a distance from any large object (the any the Roche Limit), where the Roche ), tides of the big object are stronger than the gravity of smaller objects in orbit smaller Inside this distance small objects are torn apart objects Saturn’s Roche Limit: Roche 2 ½ radii Jovian Ring Systems: Jovian Roche Limits Saturn’s Rings: Saturn Fine Structure Very many fine rings Very Gaps associated with Moons: Moons: Moon Mimas clears out Mimas clears Cassini division Cassini Shepherd moons keep narrow F ring in place narrow Saturn’s Rings Rings vs. Earth (to scale) vs. Distant E ring associated with volcanoes from moon Enceladus Enceladus Rings of Jupiter, Uranus & Neptune Uranus Rings are thinned out Rings Not visible from Earth Not Jupiter Uranus Neptune Uranus’ Shepherd Shepherd moons Lifetime of Planetary Rings Lifetime Why does Saturn have the brightest ring Why system now? system Ring particles slowly drift apart and disperse: the rings fade disperse: Saturn’s rings may be 50 Million years Saturn rings old to be so bright old In 100 Million years Triton may disrupt to give Neptune the brightest rings to Pluto and Charon Charon Inspired by Neptune’s discovery workers Inspired discovery interpreted uncertainties in Uranus orbit as indicating more planets as Many observational searches undertaken Many 1930 Clyde Tombaugh discovered Pluto Irony: Uranus orbit was fine, Pluto is too small to have any impact on it small Pluto Pluto 40 A.U. from Sun 40 1137 km (asteroid size) 1137 Appears as very faint star never visible to the naked eye to Images very painfully constructed, very poor resolution poor Pluto’s Moon Charon Pluto Moon Charon Larg...
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