08-23-2010, 06:28 AM | #46 |
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Well, we all know that time isn't fixed. It will crawl when you want it to go fast, and it will go fast, when you want it to crawl...
I once read something about time travel that I might think is true. It said you couldn't physically travel back or forth in time (except, using natural events, such as the passing of time). But you could go as an "observer". There's also a nice short story by Robert Silverberg: "When we went to see the end of the world" that shows a very interesting view about time travel. |
08-23-2010, 07:55 AM | #47 |
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It is an interesting conundrum which really crosses the line between between physics and philosophy as to why it is that we can travel in space, but not in time (other than in one direction, and at a fixed speed. General Relativity describes the universe as consisting of 4 dimensional spacetime - 3 dimensions of space, 1 of time - and there's nothing "different" about the time dimension; it's mathematically equivalent to the spacial ones. And yet we can easily travel through the spacial dimensions, but not at all easily through the temporal dimension. Nobody really knows why that is.
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08-23-2010, 07:57 AM | #48 | |
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Not possible, when would lunchtime or 'going home time' be if Time did not exist ...
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08-23-2010, 08:04 AM | #49 | |
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08-23-2010, 08:25 AM | #50 |
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Isn't one difference that any movement in space requires time, but movement in time does not require space?
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08-23-2010, 08:39 AM | #51 |
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That is the physical situation in which we find ourselves, yes. What I meant was that in GR the four dimensions are mathematically identical - there's nothing that singles out the time dimension from the other three.
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08-23-2010, 08:42 AM | #52 | |
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Is it something to do with timelines - and things are touching (themselves) in the time dimension, even if they're not in contact with anything in the 3 space dimensions, and the earth is helical spaghetti instead of a sphere? http://books.google.co.uk/books?id=M...0helix&f=false |
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08-23-2010, 09:07 AM | #53 |
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The clip describes the theory of increasing speed causing the slowing of time.
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08-23-2010, 09:22 AM | #54 |
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08-23-2010, 12:26 PM | #55 | |||
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08-23-2010, 12:43 PM | #56 |
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This just proves the point, I guess, because I would have assumed the meeting was moved to Tuesday!
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08-23-2010, 01:20 PM | #57 |
Bah, humbug!
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Many serious physicists have begun to ponder whether time indeed is static and our perception of it as fluid is but an illusion. According to these theorists, the assumption that time is static removes many of the mathematical difficulties inherent in current theories. It also means that we have not yet been born and at the same time are long since dead.
Last edited by WT Sharpe; 08-23-2010 at 01:55 PM. |
08-23-2010, 01:50 PM | #58 | |
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We know that astronauts in our day have already traveled through time. Only microseconds, to be sure, but the time dilation experienced by lunar astronauts away from the earth's gravitational field (which also causes distortions of time), and the distance into the future they have traveled, is measurable. To date, the only person I know of to successfully travel is a reverse direction through time is Superman, who does it by traveling faster than light in a counter-clockwise direction around the earth. For the rest of us (to date anyway) time seems to be a one-way journey. As I understand it, events on the quantum scale are not subject to the limitations of time's arrow, and may explain such mysteries as quantum entanglement, in which information gives the appearance of violating the limitations of light speed. Particles moving in a reverse direction through time may even account for antimatter. Anti-particles may simply be normal particles traveling is a reverse direction through time, and what appears to us as the annihilation of each in particle/anti-particle collisions may be simply one and the same particle reversing its direction through time. |
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08-23-2010, 01:51 PM | #59 | |
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I used the "If I'm moving toward something and you move it forward,..." example because that was the one that TGS offered, I used it to illustrate why, to me, it didn't fit. |
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08-23-2010, 01:59 PM | #60 |
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