Quick question, I didn't want to comment but it was based on time and space...

Theories are just that, their ideas that are ideas until proven correct or wrong.

The universe always does expand, i mean look at black holes, etc, think of them like "babies" etc...

I'm half asleep so if i sound like a moron ah well...

But its doubtful that it'd be able to just go back in time to visit alternative universes since say you went and sluged your mom in her stomach, there would be many alternative universes for that, there'd be one where you didn't hit her, one that you stabed her, one that you shot her, one that she went to the hospetal, one that she shot you, etc...

It'd be nearly impossible for ALL of those to be avalable in a timeframe that it didn't happen..
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