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Show ALL Forums  > Science/philosophy  > Time Travel, again      Mod Threads Home login  
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 Author Thread: Time Travel, again
 RegnisGnaw

Joined: 5/8/2008
Msg: 76
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Time Travel, again
Posted: 7/10/2008 11:28:00 PM


Travelling to the future at different rates is even quite possible, and there are people right now who are doing it. I'm referring pointedly to astronauts, who being significantly further from Earth's gravity well experience time at a different rate. Heck, even people in multi story buildings are travelling through time at different rates.


Okay, how exactly does being further away from Earth's gravity change the rate you experience time?

First of all, gravity has absolutely nothing to do with time. Speed does, but also if you read Theory of Relativity time is relative to the observer.
 RegnisGnaw

Joined: 5/8/2008
Msg: 77
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Time Travel, again
Posted: 7/10/2008 11:29:42 PM


Yes. Time dilation means that time is stretched or expanded. You experience 1000 years, while the relativistic traveller experiences ten. Time literally slows for him.

On the round trip, you'll be 2000 years older, he'll be 20 years older.


No, you're wrong there. Remember that according to relativity time is relative to the observer. From your POV, time is slower for him. From his POV, time is normal for him but super fast for you.
 Spinor

Joined: 3/17/2008
Msg: 78
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Time Travel, again
Posted: 7/15/2008 10:06:51 AM
I don't think that this question makes sense, yet, because no one really knows what time is. We know that it manifests itself in non-linear relativistic terms but we still don't know if it's a fundamental or emergent property...



First of all, gravity has absolutely nothing to do with time.


According to General Relativity, gravity is the resultant effect of objects moving through space-time.
 pamas

Joined: 12/12/2006
Msg: 79
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Time Travel, again
Posted: 7/15/2008 6:29:39 PM
THERE IS NO TIME

THERE IS ONLY SPACE


 stargazer1000

Joined: 1/16/2008
Msg: 80
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Time Travel, again
Posted: 7/16/2008 2:57:08 PM
The answer of how to go about it would have to depend on a sufficiently thorough understanding of the nature of time as it relates to the other "dimensions" of the universe. How do you define "now." What exactly is "time" and how is it actually interacting with the universe in order to give the impression that it is moving in a particular direction. All processes in the universe can work in reverse but why don't they?

You've been given some examples of "time travel" in travelling close to the speed of light or close to an extreme black hole but that's only an observation of the effects of an interaction between time and space in extreme situations.
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