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Neptune is thirty times farther from the Sun than we are, and is so far away that the Sun just looks like a star, so as you can imagine the upper atmosphere is freezing cold - just -225 degrees Celsius! This is extremely cold.

However, inside Neptune it is hot - very hot - and reaches tens of thousands of degrees, hotter than the surface of the Sun! This immense difference between Neptune's bitterly cold upper atmosphere and seething hot core causes huge convection currents to flow through the planet, stirring its air and causing Neptune to have the fastest winds in the solar system.

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14y ago

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