This is an image of Triton.
Image from: NASA
What the Inside of Triton is like
Triton is mostly made of ice, therefore there is probably a small core of some rocky material at the center, covered with different kinds of ice.
If Triton is warm enough inside, then there could be water. If water is present it could provide and environment suitable forlife.
If the interior is warm enough, the inside of Triton may move, and turn over. This type of interior motion leaves clues on the surface of a planet, such as folds and deep canyons. Surface plate motion and earthquakes are big clues about interior motions of the Earth.
The fact that this moon is made primarily of ice suggests a certain path for it's history.
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