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to go back to something means you've been there so your either talking about the movie or already know the answer.

in the unlikely event that your asking about time travel then you would, in theory, have to creating a wormhole and loop it to itself at a later time or by generating enough energy to fold space time around yourself and collapsing it back onto you; both attempts could theoretically destroy the universe

if the universe was destroyed the laws of physics would dictate that matter pop into existence due to laws of quantum mechanics and the impossibility of nothing. on a side note looping a wormhole into itself at a latter time is most easily done out of the two but the major flaw to it is any attempt to go into it would destroy the occupant due to acceleration and the limited hold of matter.

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14y ago

What else can I help you with?