. . . 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?
To learn more about the book this website supports, please visit its Information Center.