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Hi there,
according to  Stephen hawking  the  universe was initially a very dense singularity .due to the pressure there was an explosion (massive supernova explosion) and   the singularity started expanding (even now).from  there galaxies ,stars ,planets formed.
i hope this helped u...
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According to big bang theory universe was formed when a high mass celestial object exploded and its remains formed the universe. Good answer right
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