The solar system is the system of stars in the Milky Way galaxy. It has the Sun as its center and the 8 planets as the Sun natural satellites. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Some of these planets also have their own natural satellites or moons. Moreover, there are dwarf planets, asteroids, comets, and other space objects. Mercury is the planet that takes the shortest time to orbit the Sun, and Neptune is the planet that takes the longest time to orbit the Sun.