You all seem to be slightly confused about the big bang so I'll give a shot at explaining it.
Before the big bang there was a type of matter which has not been observed yet (usually called anti-matter). This started pulling inwards causing friction and a huge density change, the friction cause extreme heat which in turn exploded expelling matter (the big bang has now happened). The matter which was thrown out starts to gain its own gravitational pull which created large masses (planets).
Get it?


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