The Solar System is made of planets that orbit the sun, as well as moons, comets, asteroids, minor planets, and dust and gas. Everything in the Solar System orbits or revolves around the Sun. The orbits are not round, they are elliptical which is more of an egg-shaped.
The first four planets (the four closest to the sun) are known as the inner planets. These planets include Mercury, Venus, Earth and Mars. These planets are made mostly of rock. The next five planets (the five further away from the sun) are known as the outer planets.
These planets include Saturn, Jupiter, Uranus, Neptune, and Pluto. Saturn, Jupiter, Uranus, and Neptune are known as the gas giants because they are made mostly of gases. Pluto is coated with ice. Pluto is recently been classified as a dwarf planet and not a real planet.
