All of this formed approximately 4.6 billion years ago. Many scientists think that THE BIG BANG THEORY is the main cause of the Solar System.In this Galaxy there are some planets which are orbiting the Sun. In addition to planets,the Solar System also consists of moons,comets,asteroids,minor planets and dust and gas.
THE SUN
Everything in the Solar System orbits or revolves around the Sun. The Sun contains around 99.86% of all materials in the Solar System. The larger an object the more gravity it has. Because the Sun is so large, its powerful gravity attracts all the other objects in the Solar System towards it. Sun provides us with the most important light and heat energy.
Sun is the main source of energy. All living things on planet Earth depend directly or indirectly on Sun for food. Chemically , about three quarters of the Sun's mass consists of hydrogen , while rest is mostly helium.
The planets are in the following numbers :
1. MERCURY
2. VENUS
3. EARTH
4. MARS
5. JUPITER
6. SATURN
7. URANUS
8. NEPTUNE
The planets in our solar system, in order of the nearest to the Sun
The moons of planets




