1 The solar system is a celestial system with the sun as the center and constrained by the sun's gravity, including the sun, planets and their satellites, dwarf planets, asteroids, comets and interplanetary matter. The solar system is located about 24,000 to 27,000 light-years away from the center of the Milky Way.
The formation of the solar system began about 4.6 billion years ago with the gravitational collapse of a giant interstellar molecular cloud. Most of the mass in the solar system is concentrated in the sun, and among the remaining celestial bodies, Jupiter is the most massive. The eight planets revolve around the sun counterclockwise. In addition, there are smaller celestial bodies in the asteroid belt between Jupiter and Mars.