Ast101 Lecture - November 6 2012.pdf

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

AST101: The Sun and its Neighbours Lecture November 6th, 2012 Moons and Rings of the Jovian Planets - why do Uranus and Neptune look blue? - their clouds are white, but methane in their atmospheres absorbs red light, so the planets look blue - moons can be bigger than planets - Ganymede (Jupiter) is nearly the same size as Mars - Titan (Saturn) - Mercury - geologically dead - Callisto (Jupiter) - about the same size as Mercury - Io (Jupiter) - smoldering pool of lava - volcanoes all the time - Our Moon - Europa (Jupiter) - very young surface - - Triton (Neptune) - doesn't have many craters - ice? - Eris (dwarf planet) - largest Kuiper belt object - Jupiter has over 67 moons - Saturn has over 62 moons - Uranus has 27 moons - Neptune has 13 or more moons - other objects comparable in size are Mercury, the Moon, and Pluto Trends in the Jovian Moons Large and Medium-sized Moons: - past or current geological activity, prograde orbits (except Triton, moon of Neptune, which orbits the wrong way. It must have been captured). These moons must have formed f
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