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Neptune is −218°C (55.1K / -360.4°F).

Uranus is -224 °C (49K / -371.2°F ).

Neptune, the 8th planet, is the furthest planet from the sun, however it has an exposed core composed of extremely hot molten ammonia. Which provides a little heat to the planet, but still not enough to prevent it being freezing.

Because of Neptune's very hot core, Uranus, the 7th planet, is the coldest.

Their cold temperatures are because they are too far from the sun for its heat to warm them.

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