Temperature and seasons

The large distance between Neptune and the Sun means that the average temperature on Neptune is a very cold -225°C. This temperature is low enough to freeze methane. Bright clouds of methane ice form in the upper atmosphere, and cast shadows on the lower cloud layers.

The planet's axis is tilted by nearly 29° from the vertical, but since Neptune takes 165 years to orbit the Sun the time between any seasons is very long and temperatures do not vary much season to season.

Neptune's interior is believed to be very similar in composition and structure to that of Uranus. Core temperature is therefore expected to be around 7000°C and core pressure about 20 000 atmospheres.

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