Time Travelling Problem...?

Question

If you went back in time, would you be able to change events that have already happened? What happens if you modified the past and got stuck in a loop. For Example: You hate ure grand-father, and go in the past and kill him. But if he was killed, then your father cannot have been borned and neither you. If you couldn't have been born then how did you go back in the past and killed your grand-father, meaning you didn't so if you didn't.... (you get the cycle)

Answer 1

This paradigm is the plot for lots of movies, (Back to the Future, Somewhere in Time, Dr. Who, etc). however it's not a question worth considering because time travel isn't physically possible nor will the advancement of technology ever make time travel possible.

Here's a couple of reason's why:

1. If time travel was possible, it would make logical sense that we would have had 'vistors' from the future already. I'm sure they would have loved to come back and 'fix' a few things.
2. The physcial science will not allow it based on time itself. For you see.. time is relative to the object and/or observer. This is the addtion to Einstien's theory of relativety where as time consided by Einstein was a set unchangeable measurable 'dimension'. In fact, time is not only 'bend able' but time is relative and different for each observer.

2. Now let's talk about 'Imaginary Time'. This is a proven physic theory that states that each object/person has it's own 'normal time' in which their 'journey' has progressed but their history is unknown because their 'travel' could have gone down multiple paths to reach the point they are at today.

3. Now let's talk about the physical location. So.. you want to go back 70 years. You get this machine set up in your back yard that can time in an instant to 70 years ago. Poof! Your sitting out in the middle of space wondering where the oxygen is! For you see.. not only is the earth spinning and rotating and wobbleing at a somewhat non uniform rate... it's also rotating around the sun... while spinning around the galaxy ... while the galaxy is blasting through space at a million miles and hours. Your machine would have to be able to calculate exactly where the earth was in it's rotation, wobble, orbit and location in space. Trow in the time factor... and your screwed.

Sorry.. no need to worry our brains about this kind of paradigm as it's not possible now.. nor will be in the future.

Hope this helps!

Answer 2

Well, the movie Back to the Future says that if you interfere with your parents' relationship, you will cease to exist. Marty McFly nearly erased himself from existence because he accidentally caused his mom to fall for him instead of his dad.

And if you think that's confusing, consider the Terminator movie. Reese was sent back in time by John Connor to protect John's mom Sarah from being killed by a Terminator. With Sarah dead, John would never be born. Reese meets Sarah and has sex with her. Guess what? She gets pregnant- with John! So John sent HIS OWN FATHER back in time! Trippy, huh?

Answer 3

It could allow it to happen if alternate realities were so, they say each choice we makes sets us on a path. if that was the case then it would allow the possibility of of killing your grandfather from another reality , therefore in turn killing of the cycle of the paradox.

Answer 4

Backwards is tricky, forwards on the other hand, is possible and in fact does exist. The faster you are moving, the slower time moves. That's the part that trips me out....

Answer 5

I don't know of anything factual to base that upon. I think you would have ceased to have existed at the exact moment you killed your grandfather.

Answer 6

Any significant alteration in the space-time continuum would change history as we have known it. You would "erase" your own future.