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Since Neptune, the 8th planet, is the furthest from the Sun, you'd expect it to be the coldest.

However, it isn't.

Neptune has a very hot core of molten ammonia and various gasses such as methane, which slightly heats the freezing planet.

In fact, the coldest planet is the 7th planet in our solar system, Uranus.

Neptune, the furthest, has an average temperature of -218°C (55K).

Uranus, the second furthest has an average temperature of -224°C (49K).

Pluto is -230°C (43K), however it is no longer classified as a planet.

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13y ago

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