According to the astronomers first everything was an incredibly solid, heavy ball of a matter. This heavy ball exploded billion of years ago and as a result the Universe was formed. The moment of the explosion of this ball is known as “Big-Bang”. After this explosion the early universe was very small and too hot but later it got cooled and it exploded and spread out into the small pieces. Small pieces formed the basic elements called hydrogen and helium. Then the pieces join together which results object formed. Over billion of years the object becomes Galaxies, Stars and Planets. How the universe was formed is still only an idea.

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