Io’s volcanoes

• Io’s interior heated by the tidal force of Jupiter
  • this is the force which causes the synchronous rotation of all close planetary satellites
  • tidal forces tend to make orbits circular
    • there would be no heating for a circular orbit demo
  • orbital resonance with Europa creates slightly eccentric orbit

• • Every 2 orbits of Io, there is one orbit of Europa board
  • Europa pulls on Io especially hard then
    • recall gravitational pull depends on distance r as 1/r2
  • Io’s orbit made slightly elliptical

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