NEARLY THE SAME SIZE AS
MERCURY, Callisto is the third largest moon in the
Solar System.
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| Callisto |
It is composed of almost equal amounts of rock, and ice, but is only partially differentiated with no defined core or mantle. It is suggested that the moon grew slowly over a great deal of time by collecting particles that were left in orbit after
Jupiter formed.
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| Structure of Callisto |
Because it was slow, heat dissipated so the layers we typically see in other large bodies didn't form.
Callisto's surface is heavily cratered and ancient, featuring no signs of geological activity. It also possesses a tenuous carbon-dioxide atmosphere.
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| Ocean inside Callisto |
A salt water ocean may exist deep within the moon, but conditions for life aren't as favourable as they are on its neighbours,
Europa and
Ganymede.
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