Proof there's no time travel?

[TheLefty]

http://www.darkestofdaystv.com/ That got me thinking. If there truly a such thing that as time travel wouldn't we have seen people form the future by now? If time is simultaneous then the creation of the time machine would have happened at the same time as the creation of the universe, meaning, in theory, that people would have gone back in time and done something that would shout "TIME MACHINES!" at the top of it lungs.

Though you could say that time is not simultaneous and so we would have to pass into the time when we do have time machines in order to go back and change but then (taping into that 10 minutes of philosophy a substitute teacher after school) you could also say that we could have passed that time only not noticed it because...and that's when I left.

Back on topic though, what's your opinion on this subject?

 

[master m99]

well lets say you could travel back in time you couldn't do anything. ok lets say you go back in time and kill Hitler then he would never do all of the stuff that caused you to go back in time to kill him so you would have never gone back that means you would never kill him so he is now alive and has done all the stuff he did so you would go back to kill him so he would be dead and so on and so on.

 

[ArcWinter]

That makes no sense. How can you travel through time when there is no future?

 

[Daveman]

...pretty sure that was in the hitchhikers guide books...

 

[walls of cetepedes]

well lets say you could travel back in time you couldn't do anything. ok lets say you go back in time and kill Hitler then he would never do all of the stuff that caused you to go back in time to kill him so you would have never gone back that means you would never kill him so he is now alive and has done all the stuff he did so you would go back to kill him so he would be dead and so on and so on.

That's the best written out TIME PARADOX explanation I've seen.

 

[nova18]

I proposed this theory to people years ago when I thought I was a genius.
I said that if you time travel was created in your future, and you made a note of todays date, you would come back to visit yourself.

Naturally 2 flaws exist:
a) Time travel may not exist until after you die.
b) There may be rules of time travel that do not allow you to make contact with anything or anyone in the time you visit.

 

[Thyunda]

well lets say you could travel back in time you couldn't do anything. ok lets say you go back in time and kill Hitler then he would never do all of the stuff that caused you to go back in time to kill him so you would have never gone back that means you would never kill him so he is now alive and has done all the stuff he did so you would go back to kill him so he would be dead and so on and so on.

Somehow, your avatar has managed to explain the same amount as your post.

 

[grimsprice]

Re-hashing the old time travel paradoxes is just a bother. Time travel is impossible unless you chuck free will and choice out the window.

 

[DrDeath3191]

I believe Einstein proved time travel impossible. Plus, as Mr. m99 stated, if time is continuous, you could never actually change anything otherwise you would never need to change it.

 

[oliveira8]

...pretty sure that was in the hitchhikers guide books...

The reason was that no mone would want to end up being their own relatives.

 

[walls of cetepedes]

Actually, I built a time-machine.

It looks like an ordinary toilet stall, but if you flush the toilet you will be send an hour into the future.

The downside is that it takes 60 minutes for the time-machine to activate after flushing it.

I've got one of those too. Except it goes 2 hours into the future.

 

[TheLastCylon]

Perhaps when you time travel, you enter a dimension exactly like our own universe, where paradoxes wouldn't apply.

 

[Kpt._Rob]

They time traveled on Star Trek. And if it's good enough for Star Trek, it's good enough for me.

In all seriousness though, we already have solid theories as to how one could travel into the future at an accelerated rate (astrophysics, someone else can explain it if they care to), but we couldn't bring them back. That said, it seems to me that a diverse series of time streams might already exist, a time traveler would knock any given time stream off into a second divergent time stream, and since we have not encountered a time traveler, we can safely assume that we are not in one of those divergent time streams.

That makes no sense. How can you travel through time when there is no future?

This makes one very big assumption, that being that the universe is not diterministic. It seems to me that the universe is probably diterministic for the most part, with exception to potential interference from outside causality. If this is the case, my assumption (again, a big assumption, but a reasonable case can be made for it) implies that all time exists as a dimension before the first dimension, and therefore all time exists at once. We can only percieve it going in one direction, but that does not mean that it actually does go only in one direction. If you've read the comic for Watchmen, Doctor Manhattan does a pretty good job of explaining that view of time.

 

[dalek sec]

Actually, I built a time-machine.

It looks like an ordinary toilet stall, but if you flush the toilet you will be send an hour into the future.

The downside is that it takes 60 minutes for the time-machine to activate after flushing it.

Eh I like the blue phone box model, has a hell of a lot more room.

 

[Ursus Astrorum]

I go by the theory that events from the future have already happened and the past cannot be changed. So say that someone goes back in time to kill hitler when he was still unimportant or, say, a child. Through some happenstance, they wouldn't kill him, and may even serve to save him or inspire him to his influential role. If this person is blonde with blue eyes, all the more awesome.

Why haven't we seen anyone? Think about it: A man walks up to you in strange clothing. "I'm from the future."

Seriously, how would the average citizen respond to that?

 

[The Hairminator]

Another theory would be that whenever you timetravel you create (or use an already excisting) alternate universe where the things you do really take effect, but it would only change that particular universe's future.

 

[Burck]

The popular way around OP's logic is the infinite realities theory. This theory says that all different possible actions (down to which way a photon moves) are simultaneously played out in an infinitesimal number of other realities. I think this idea was popularized by having some grounding in Science's rebellious kid known as Quantum Physics.

Schrodinger's Cat. Google it.