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0-degrees Kelvin corresponds to -273-degrees Celsius. The surface of Pluto, in comparison, can range from a low temperature of 33 Kelvin (-240 degrees Celsius or -400 degrees Fahrenheit) and 55 Kelvin (-218 degrees Celsius or -360 degrees Fahrenheit). The average surface temperature on Pluto is 44 Kelvin (-229 Celsius or -380 Fahrenheit). Back in the days when Pluto was still a planet, it was the coldest planet in the Solar System. But now itâs just a regular temperature dwarf plant â poor Pluto. Neptune is now the coldest planet.
Planetary scientists have calculated Plutoâs density at between 1.8 and 2.1 g/cm 3. From this density, they have calculated that its interior is probably 50-70% rock and 30-50% ice. Decaying radioactive elements inside Pluto would heat the interior of the dwarf planet, allowing the rock and ice to move around. At this point, the interior of Pluto is probably a rocky core surrounded by a shell of ice.