Mercury takes 87.97 Earth days to revolve around the sun, which is approximately one quarter of the length of a year on Earth. In contrast, it takes 59 Earth days for a single day to pass on Mercury.
Mercury is similar to the size of Earth's moon and is the smallest planet in the solar system. It is a rocky planet with a thin atmosphere of oxygen, sodium, hydrogen, helium and potassium. Mercury is the closest planet to the sun and can reach temperatures of 800 degrees Fahrenheit during the day. The sun appears three times bigger from the surface of Mercury than it does from the Earth. The surface gravity is also much weaker than the Earth, so a person weighing 100 pounds on Earth would only weigh 38 pounds on Mercury.