How Hot is Mercury?

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at its hottest point, the temperatures on Mercury rise as high as 700 kelvin or 430 degrees Celsius for regions that directly face the sun.
mscrawford23, Answers Expert

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Mercury is the closest planet to the Sun. The side facing the Sun is very hot, it can go upto 698 degrees Fahrenheit, the other side is cold. Mercury also has a very dense body.
nazimap, Answers Expert
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