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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.
The gravity on Pluto is only about 8 % of the gravity on Earth. If you weigh 70 kg on earth, you would weigh only about 5 kg on Pluto. It is very, very cold and the sun can only be seen as a very tiny spot. Temperatures can go down to - 240Â° C. Pluto's only moon , Charon, is almost the size of Pluto itself.