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No. Venus is the hottest planet, even though Mercury is the closest planet to the Sun.

Mercury receives the most solar radiation from the Sun, and its rotation is very slow, so the surface can heat up to over 430 degrees C. But when that part of the surface faces away from the Sun, the temperature drops to minus 200 degrees C. There is no atmosphere to distribute the heat.

By contrast, Venus, the hottest planet, has a dense atmosphere of carbon dioxide and sulfuric acid clouds. This is the reason that Venus can get hotter than Mercury. The atmosphere traps solar heat and keeps the entire planet very hot all of the time. It is like a greenhouse with no exhaust valve and no door to let the heat out. The surface temperature of Venus is about 460 degrees C even at night.

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9y ago

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