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Of the Jovian planets, which generates the least internal heat?

The brightest and probably youngest surface of any moon of Saturn belongs to:

Europa is covered with an ocean of ___________ .

Like our Moon and most others, all four large Jovian satellites have one side constantly fixed toward Jupiter as they revolve and rotate.

Because the probe came so close, Voyager 1 sent back high resolution photos of detail on the surface of Titan in 1980.

Like Titan, Triton has a nitrogen atmosphere.

It is likely that both Pluto and Triton were originally __________ .

The atmospheres of both Titan and Triton are mainly __________ .

The moon _______ may have erupted to create the E rings around Saturn.

Of all the Galilean satellites, the surface of Europa is the youngest in age.