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Mercury is both a hot and a cold planet. During the day, it gets 750 degrees Fahrenheit but at night it drops to below -300 degrees Fahrenheit.

Mercury is close to the Sun and has no atmosphere, so the Sun's powerful rays can easily heat the surface. However, on the side away from the Sun, all of the heat is radiated off into space.

Because the planet turns so slowly, each period of daytime or night is approximately 88 Earth days in length.

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