What evidence is there that is was a nitrogen volcano, and not just a normal molten lave type?
Spectra.
Exactly!
http://solarsystem.nasa.gov/planets/...?Object=Triton
Remote temperature readings place it as the coldest surface known anywhere in the Solar System.
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"The bread's hollowed out --- the veggies go on forever --- and --- oh my God! --- it's full of meat!" - Maksutov
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