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how is universe formed?Is it by big bang theory?
According to the Big bang theory the universe is continuously expanding. If so there must have been a time, when all the present galaxies had fused into a single tiny object of  extreme density and temperature. It is presumed that as a result of sudden explosion of tiny object the universe was formed and still it continues to be in a state of expansion. According to some scientists this might have happened about 15 billion years ago.


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