What is Big Bang and what is Big Crunch? Will Big Crunch occur in future?

One of the most important theories about the beginning of the universe is the big-bang theory. The big-bang theory explains the formation of heavenly bodies such as galaxies, stars, and planets and many more.

According to the big-bang theory, all the matter in the universe was originally concentrated in one vast lump called primeval atom which was 100 million light years wide. This super dense and extremely hot primeval atom exploded with a big bang.

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