lecture13

lecture13 - Last time : Planets properties primarily due to...

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Last time : Planets properties primarily due to distance from sun 1) in early formation, ices condensed at large r where it was cool aglomeration to > 15 M earth enabled accretion of gases H, He 2) hot inner planets can’t retain light gases 3) atmosphere important to insulating planet Today , fnish outer solar system, then search For extrasolar planets
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Jovian moons
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Io -- very active vulcanism rotates synchronous w/ orbit eccentric orbit (due to Europa) ==> tidal heating of interior (100 m stretching of surface) motion in J’s B-Feld ==> 4x10 5 V , 3x10 6 amps ==> ionic ejection and Jup. auroroa
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Europa -- similar to our moon, but tidally heated by Jupiter ==> covered by frozen salt water tides ==> fractures fractured ice surface
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Ganymede cratered icy surface Callisto heavily cratered solid surface
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Comet Shoemaker-Levy comet impact (7/94)
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Saturn : density 0.69 gr/cc belt zones like Jupiter but methane haze ==> less visible moons cause gaps in rings (due to gravitational perturbations)
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lecture13 - Last time : Planets properties primarily due to...

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