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Cold Volcanoes
Neptune's moon Triton is the coldest place in the solar system, with a surface temperature of -235 degrees Celsius (-390 degrees Fahrenheit). As cold as it is, there are active volcanoes on Triton in which the erupting liquid is frigidly cold liquid nitrogen.
At Triton's surface, nitrogen normally exists as frozen ice. But under the surface, where Triton is heated by slow radioactive decay of its rocks, nitrogen melts into a liquid. When the liquid heats up still further, it boils and erupts through the surface, spewing evaporating liquid nitrogen high into space.

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