Reported Post by xxtrem3

xxtrem3 · Oct 23, 2011

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Post: Is time travel possible?
Forum: Something For All
Assigned Moderators: cosrob97, JohnK, Alteranz

Posted by: lured yah
Original Content:

Swan said: ↑

Technically we're all time travelling, right now. Time is the fourth dimension of reality. 3-dimensional space and time itself knit a fabric together (aptly referred to as space-time) which is what we're all moving through every conceivable moment of every day. Thus, we're travelling - seemingly forward - through time.

Einsteinian relativity predicts that the faster you move, i.e. the closer you get to the speed of light, the slower time moves to compensate. This is because space and time are related. Put together, they must be a constant, so in order to compensate for the increased space traveled time itself must slow. This itself is observable in subatomic particles in a laboratory, however to approach such speeds is nigh on impossible for anything much larger, for example a human. We're still affected by such relativistic time, for sure, however it's on such a small scale that it's not at all detectable.

Einstein also postulated that it is impossible for anything to move faster than the speed of light, and thus, while time may slow, there's no conceivable way to actually stop or reverse time itself.

Consider a clock. When you see it say 8 O'clock, what's actually happening is that the light is bouncing off the clock before hitting your eyes. This takes time, albeit an infinitesimally small amount. Suppose you were travelling at say, 80% the speed of light, away from the clock then. Relative to you, the light that would reach your eyes to say "8 O'clock" is thus taking longer to reach your eyes, as you're moving away. Because of this, time would indeed appear to be slowed. Now consider if you were moving AT the speed of light. The clock would be frozen at "8 O'clock." If you were to go any faster (which is impossible) then you would theoretically be seeing the light which may say "7:59".

Edit:

This reminds me of Charles Yu's "How to Live Safely in a Science Fictional Universe"
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great post, sums up my thoughts
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JohnK · Oct 24, 2011

Yep, deleted the post.

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