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The planet Neptune has a deep, dense atmosphere of gases and liquids, so there is no definitive surface to measure. So the closest approximation of its "diameter" is accurate to about 30 kilometers, and is 49,528 km (30,775 miles), which is almost 4 times as wide as Earth.

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Why is the temperature of Neptune very cold?

Because it is 30 times as far from the sun as earth is. This means that an equatorial square metre on Neptune gets 1/900 of the solar radiation (and so energy) compared to an equatorial square metre on earth.


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How far is the distance across the solar system to Neptune?

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What is the average distance form Neptune to the sun in miles?

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What is equatorial diameter?

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