Origin of the Earth
1.1 ORIGIN OF THE EARTH
It is believed that the earth is formed 4.6 billion years ago. The existence of the earth and other planets came into account because of the big bang explosion. It is a highly accepted theory by astronomers and cosmologists.
The universe consists of millions and billions of galaxies. The galaxies incorporate millions of stars. The single star (like the sun) and planets, asteroids, and comets that are revolving in a unique elliptical orbit around the sun are known as our solar system.