The Solar System is the name given to the collection of celestial bodies that orbit our star, the Sun. It consists of eight planets, five dwarf planets, hundreds of moons, and millions of asteroids, comets, and other small objects. The Solar System is located in a spiral arm of the Milky Way galaxy, about 27,000 light-years from the galactic center. It takes about 230 million years for the Solar System to complete one revolution around the galaxy.
The Sun is the center of the Solar System and the source of most of the energy and light that reaches the planets and their moons. The Sun is a yellow dwarf star, with a diameter of about 1.4 million kilometers (870,000 miles) and a mass of about 330,000 times that of Earth. The Sun accounts for 99.86% of the mass of the Solar System. The Sun has a surface temperature of about 5,500°C (9,900°F) and a core temperature of about 15 million°C (27 million°F). The Sun produces energy by nuclear fusion, converting hydrogen into helium in its core.
The planets are the largest and most visible objects that orbit the Sun. They are divided into two groups: the inner planets and the outer planets. The inner planets are Mercury, Venus