The planet of Mercury is extremely hot during the day and becomes terribly cold at night. The temperature during the day on Mercury can reach as high as 800 degrees Fahrenheit, while the night temperatures can plunge to almost 300 degrees below zero.
There is no proof that life has ever occurred on Mercury, and the planet's hostile conditions likely do not allow for it. The nearest planet to the sun is Mercury, located roughly 36 million miles apart. All of the other planets in the solar system are larger than Mercury, and the Earth's moon is almost the same size as Mercury.