JUPITER - JUPITER History 4.5billionyearsago sincethen...

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JUPITER History 4.5 billion years ago planetisimals collide forming large protoplanet   collects gasses and grows rapidly to form planet   eventually no more gasses to collect   . since then no changes Moons: 16 moons mainly ice and rock no atmospheres all in synchronous orbit Galilean Satellites note: Jupiter is heat source Figure 9.7 shows the four Galilean satellites.  [Link to Figure 9.7] Io in orbital resonance with Europa orbital period of Io = 1/2 period of Europa this leads to strong tidal forces on Io OPTIONAL MATERIAL:
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strong tidal forces heat Io causing volcanoes of sulfur compounds [observed by spacecraft] o Figure 9.8 shows the volcanoes on Io.  [Link to Figure 9.8] surface has few impact craters => constantly evolving This animation shows Io (note the sun in the distance when on the  shadowed side of the moon):  http://www.planetscapes.com/solar/cap/jup/viojup1.htm
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