What is the solar system? The solar system contains 9 planets that move around the sun. Though it also contains asteroids, moons, comets, and stars. There are 140 moons that orbit around the 9 planets in our system.
Mercury is the planet closest to the sun. Like all other planets, Mercury orbits around the sun, but its orbit only lasts for 88 days. The planet was named after the Roman God ¨Mercury.¨ This planet travels 36 million miles when orbiting the sun. It moves 107,372 miles per hour. It takes Mercury 59 days to complete its turn from day to night. Mercury´s sunny side rises to 400 degrees Fahrenheit and its darker side goes down to -200 degrees Fahrenheit.