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We don't know all of the planets that are in the universe, only a very small amount. The hottest one in our solar system would be Venus.

The hottest exoplanet discovered as of March 10, 2008 is called "WASP-12b", and it's mean temperature is about 2240 Degrees C, or 4070 degrees F.

Source:

http://www.iop.org/EJ/abstract/0004-637X/693/2/1920

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15y ago

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