what is big bang ??
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The Big Bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution.
In short, the Big Bang hypothesis states that all of the current and past matter in the Universe came into existence at the same time, roughly 13.8 billion years ago. At this time, all matter was compacted into a very small ball with infinite density and intense heat called a Singularity.
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