what do you mean by big bang?
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the rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
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The universe began, scientists believe, with every speck of its energy jammed into a very tiny point. This extremely dense point exploded with unimaginable force, creating matter and propelling it outward to make the billions of galaxies of our vast universe. Astrophysicists dubbed this titanic explosion the Big Bang.
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