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The temperature would vary depending on where in the atmosphere you measured it.

The upper atmosphere of Uranus is the coldest in the Solar System, with a minimum temperature of 49 °K. It has a complex cloud structure with water clouds presumably being the deepest and methane clouds at the top.

  • The minimum temperature is -224 °C (-371 °F, 49°K).
  • At the pressure level equal to Earth's at sea-level (1000 millibars), it is -197°C (-322°F, 76°K).
  • Uranus's water-ammonia "ocean" is extremely hot, up to 6650°C / 12,000°F near the rocky core (which cannot be directly observed).

Uranus and Neptune have different internal and atmospheric compositions from those of the larger gas giants - Jupiter and Saturn, and astronomers sometimes place them in a separate category, the "ice giants". Uranus' atmosphere, while still composed primarily of hydrogen and helium, contains a higher proportion of "ices" such as water, ammonia and methane, along with substantial hydrocarbons. These are not ice in the traditional sense because they are very dense and very hot.

The vast fluid mantle on Uranus accounts for most of the planet's mass. Scientists think this consists mostly of water molecules, which are mixed with silicate, magnesium, nitrogen-bearing molecules, and hydrocarbons (molecules composed of carbon and hydrogen).

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14y ago

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