THE SOLAR SYSTEM
- The solar system includes the Sun and all the objects that orbit around it due to its gravity. This includes things such as planets, comets, asteroids, meteoroids and moons.
- The Solar System formed around 4.6 billion years ago.
- There are eight planets in the Solar System. The four inner planets are Mercury, Venus, Earth and Mars while the four outer planets are Jupiter, Saturn, Uranus and Neptune.
- The inner planetsare smaller and made mostly of rock and metal.
- The outer planets (also known as gas giants) are much larger and made mostly of hydrogen, helium and other gases.