This is an image of Triton.
Click on image for full size
Composition is generally determined by detailed measurements of the spectra
of an object. Spectral measurements of the surface of Triton reveal the presence not only of ice but of several different kinds of snow (crushed ice).
The interior composition can only be guessed. Voyager 2 did not pass very close to Triton, therefore the density, from which a general idea of composition can be made, cannot be determined. A good guess is that Triton is made of ice throughout it's interior, except for a small core of rocky material. There may be a small layer of water inside Triton, however. This depends on how much of Triton is rocky and could help warm Triton. A small layer of water could provide an environment for life. Only more exploration will help us know for sure if these things are possible.
The fact that this moon is made primarily of ice suggests a certain path for it's evolution.
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