Inside Pluto's cold heart is a planetoid surface covered in carbon monoxide snow. Being the ninth planet and most distant from the sun, its temperature is somewhere -225°C. Light on Pluto is sparse and equivalent to a moment before sunrise or after sunset. But for 20/248 earth yrs, Pluto enters Neptune's orbit experiencing even more sunlight. My guess is then the frozen methane stored in the crust would erupt into the atmosphere converting to "snow"; preceded by volcanic corrosions and radioactive heat in other cores (probably evolved over time) which created cryvolcanoes. It's quite interesting the more I learn about it. This is only a conceptual painting illustrating the rock and ice land on Pluto and by no means an accurate representation...something to dream about.
