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The coldest planet used to be Pluto, but now that Pluto's not a planet anymore, the coldest planet is Neptune. Its cloud tops are at a freezing -218 degrees Celsius. That pretty cold, but it's recorded that one of Neptune's moons, Triton, has a record-breaking temperature of -235 degrees Celsius.

Also, isn't this weird? You know that Mercury rotates slowly, right? Well, at night it rotates so slow that its temperatures reach -183 degrees Celsius, although Mercury is the closest planet to the sun in the solar system. Not nearly as cold as Neptune, but colder than it would ever be here on Earth!

Anyways, if Pluto was still a planet, it would be the coldest, but not anymore. Now it's Neptune. Hope this helps!

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15y ago

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