Time travel? Changing events? 89 replies

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IcePure

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#1 9 years ago

I'm a big fan of shows like Doctor Who and such, and the time travels in things similiar to it always gets me thinking - can we actually find a way to travel in time, and if so, can we change events?

I believe it was Einstein who theorised time travel in itself was indeed possible (general relativity?) given correct conditions (e.g Wormhole, Faster-Than-Light travel), but what do you guys think?

Also, if one could time travel at will, do you think we will actually be able to change events?

Personally, I believe that changing events, and therefore time travel in itself is impossible...sort of.

Think about it, you want to change the past so your grandafather is rich, will will in turn make you rich, however - in the new timeline, you would have incentive to time travel and make your grandfather rich, and therefore, you would not travel back in time to do so, which means no change would occur!

I think it's more likely that if we did change events, a parallel universe would be the product of such a thing.

Thoughts?




Serio VIP Member

The Dane

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11th November 2006

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#2 9 years ago

If it was/is possible, I don't think you'd be able to go back and change events concerning yourself, or time travel itself. Of course, then there's the whole multiverse stuff(You stop an event from happening, and when you go back you find the future that you had changed, but the universe you came from stays unchanged). Or at least that's what I think it is. Do correct me if I'm wrong.




Mr. Pedantic

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#3 9 years ago

We're travelling through time as we write. It's just that it's only one way, and the speed is fixed.

I think it's more likely that if we did change events, a parallel universe would be the product of such a thing.

Why? Just because it's easier for you to get your head round it? :lol:




NCC1017spock

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#4 9 years ago

Well idk how far this is gona go, but I believe that its possible for time travel to work, its just a question of what damage that can be done by it. And then depending if we still have money when the they around to building such a thing, the cost....




Guest

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#5 9 years ago

If time travel is possible (and that is a big if) I also suspect a branching universe would result. The paradoxes that result from linear time just seem to much. I.E. you go back in time to change something, so because it was changed you no longer have a reason to go back in time to change it, so you don't go back in time, but now you want to go back in time to change it. Lather, rinse, repeat.

Multiple timelines is the easiest way to solve that paradox. My main thing against time travel is that if it is possible it has already happened, since the future would have to coexist with the present and past, and so everything that can happen would have already happened. As a result someone would have already traveled back in time and we'd like see the results already.

I can, however, see the plausibility in recreating the past. After all time is just a measurement of change, so if you rearrange all of the molecules in an area to represent what that area would have looked like 5000 years ago you would have effectively traveled back in time, at least locally.




Mr. Pedantic

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#6 9 years ago
If time travel is possible (and that is a big if) I also suspect a branching universe would result. The paradoxes that result from linear time just seem to much. I.E. you go back in time to change something, so because it was changed you no longer have a reason to go back in time to change it, so you don't go back in time, but now you want to go back in time to change it. Lather, rinse, repeat.

So technically there would have to be an extra two dimensions for this to fit. Because for every single, infinitesimally small period of time, there would be an infinite number of different possibilities that could result. And then because some of those branches are interconnected, there would have to be a method of skipping directly from one to another, which gives us the second extra dimension. So...6 dimensions. Fun. I doubt these are the ones envisaged by the string theorists, though...probably just figments of my imagination. =p




NiteStryker

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#7 9 years ago

IcePure;4925623can we actually find a way to travel in time, and if so, can we change events? [/QUOTE]

Would you want to? Think about it.

Everything in the world is as it is today because of everything else that has happened in history. From the significant events (D-day invasion, invention of lightbulb) to the very small (me typing this), you dont wanna go fucking with the past.

If someone killed your great grandparents, you have no idea what ramifications that would have to the world today. Most likely, not too much, but you could go back in time and alter the course of humanity with a few simple steps.

IcePure;4925623 I believe it was Einstein who theorised time travel in itself was indeed possible (general relativity?) given correct conditions (e.g Wormhole, Faster-Than-Light travel), but what do you guys think? [/QUOTE] You traveled the speed of light for 6 months and then came back to earth everyone would have aged multiple years.

[QUOTE=IcePure;4925623] Also, if one could time travel at will, do you think we will actually be able to change events?

Again, you wouldnt want to.

[QUOTE=IcePure;4925623] Think about it, you want to change the past so your grandafather is rich, will will in turn make you rich, however - in the new timeline, you would have incentive to time travel and make your grandfather rich, and therefore, you would not travel back in time to do so, which means no change would occur!

Exactly. Just thinking about time travel and trying to understand it will give you a headache.




Mr. Pedantic

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#8 9 years ago
You traveled the speed of light for 6 months and then came back to earth everyone would have aged multiple years.

It depends how you measure this. If the six months is by stationary standards, then obviously it will have been 6 months. However, if the six months is by speed of light standards, then it will be infinitely long.




Showd0wN

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#9 9 years ago
It depends how you measure this. If the six months is by stationary standards, then obviously it will have been 6 months. However, if the six months is by speed of light standards, then it will be infinitely long.

This makes no sense as an explanation.

6 months in seconds counted by an atomic clock on board your spaceship is what I assume he meant, and then yes if you were actaully travelling at the speed of light (and not just "near to" it) an infinite amount of time would've passed.

Mr. Pedanticthe speed is fixed.

It isn't.

Tbh, travelling backwards in time is a relative impossiblity; and in the simplest of terms is actually impossible, peopel get overly conerned with the notion of wormholes etc. and if you ask a physicist this isn't actually time travel, it's something different.




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#10 9 years ago

How do we know time travel is impossible? Or relatively impossible?