lecture17 - Astronomy Picture of the Day Close-up views of...

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Astronomy Picture of the Day Close-up views of Comet Hartley from yesterday’s Fy-by
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The Galilean Moons of Jupiter Io Europa Ganymede Callisto Semimajor axis of orbit around Jupiter: 421,000 km 671,000 km 1,070,400 km 1,882,700 km
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Io
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Io’s volcanos Io’s surface is very volcanically active- it’s the youngest surface of any solar system object Numerous volcanos erupting silicate lava, with geysers erupting sulfur and sulfur dioxide Galileo orbiter found more than 100 volcanoes erupting simultaneously Voyager Galileo
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Changes in Io’s surface Voyager, 1979 Galileo, 1996
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Interior heating in Io Io’s orbit is slightly elliptical, due to gravitational pull from Europa Tidal forces from Jupiter heat Io’s interior Io radiates away 100 trillion watts of power from this tidal heating Note- diagram not to scale! The orbital ellipticity is greatly exaggerated here. Jupiter Io 1/2 degree wobble
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Europa
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This note was uploaded on 11/23/2010 for the course PHYSICS PHYSICS 20 taught by Professor Aaronbarth during the Winter '10 term at UC Irvine.

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lecture17 - Astronomy Picture of the Day Close-up views of...

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