So I've always wondered what would happen if you did figure a way to time travel and how that would effect the past present and future.
So here is my theory. Everything you try to do in the past has already happen.
So for example say you went back in time to try and change something that really could have helped you later on. You do this then go back to the present and see that everything is still the same. This is because you didn't know in the past that your future self caused this to happen. Now if you thought of going back a second time to put it back the same results would happen because the you that went back the first time didn't see the you that is there now and every time you do this nothing changes.
Now let's say you wanted to go back to make your past self see your future self. This would never happen if you never saw your future self in the past when it was you in the past because something would have gone wrong everytime. Same thing goes for changing historical events.
Now what I see in time travel would be extremely hard to calculate if we could go back in time because space is moving around you at all times so you could end up several billions of light years away from Earth because it was somewhere else in the universe. Also you would need to make sure you don't travel into something, whether it is solid, liquid, or air, maybe even dark matter though I'm not sure.
A movie that got this right was Harry Potter and the prisoner of Azcaban. It is correct because they changed nothing from the past they just didn't know Buckbeak was saved from the angle they were looking at what was happening. And all the events that happened before they had caused. I'll let them pass on the accuracy of where that land in time because it magic.
I think I've covered everything so tell me what you think and what theories you have.
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