It takes Mercury only 87 days and 23 hours to orbit the Sun. That is less time than any other planet. One reason Mercury orbits the Sun so quickly is the length of its orbit. Mercury is very close to the Sun. Its orbit is relatively short. Mercury's orbit only covers a distance of 226 million miles (364 million km). Another reason is that the closer a planet is to the Sun, the faster it moves. Mercury is the fastest planet in the solar system. It orbital velocity is 107,000 miles per hour (172,000 kph).
Mercury orbits at an average distance of 35.9 million miles (57.8 million km) from the Sun. Its orbit, however, is very eccentric. At its
