If Triton has a subsurface ocean, it will most likely consist of

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Triton's surface temperature is around -235°C, which is far below the freezing point of plain water (-18°C). However, it is also known that Triton's surface is composed mainly of water, nitrogen, and a few other ices. These substances, along with the heat generated by tidal interactions with Neptune, may create subsurface oceans of water mixed with ammonia, methane or other melted ices. This is supported by theoretical models and observations, which have found evidence of plumes or geysers on the surface that could be linked to the liquid subsurface ocean.

If Triton Has a Subsurface Ocean, It Will Most Likely