It’s the theory of how the universe began. There was some kind of explosion and all the energy and matter that’s now in the universe came from a single point.
Or rather it is the start of the universe — the event that began the expansion of all space and matter – we don’t know what caused it but it happened 13.7 billion years ago.
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Sharmin_the BEST commented on :
Thanks so much for answering my questions!!!!