How long is a year on Mercury?
Mercury takes 88 days to orbit around the Sun, which means that one Mercury year lasts less than three Earth months. Mercury has such a short year because it is very close to the Sun. According to Newton’s Law of gravity, this means that the Sun’s gravity is much stronger at Mercury than it is for Earth, and this requires it to move a great deal faster if it is to stay in its orbit, which is why it has such a short year.