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. . . two satellites, which revolve about Mars, whereof the innermost is distant from the center of the primary planet exactly three of its diameters, and the outermost five . . .

Jonathan Swift,
Gulliver's Travels, 1726

Questions to Explore:
  • The surfaces of many satellites show evidence of eruptions. What energy sources power the eruptions and keep the satellite interiors molten?
  • In what ways are worlds made of ice like those made of rock? In what ways are they different?
  • Why does Io have the most intense volcanic activity in the solar system?
  • Where in the outer solar system can we find “rain” and “oceans”? What kind of liquids make up “rain”?
  • What evidence do we have that some satellites contain liquid water?

AstronomyOnline Learning Center

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