Is getting time back theorically possible? What about wormholes, cosmic stings, white holes and black holes?
2007-07-13 07:08:44 · 13 answers · asked by caltam84 3 in Science & Mathematics ➔ Physics
If it's on you-tube then it must be possible.
2007-07-13 07:23:45 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Cosmic strings, white holes, and black holes cannot be used as time machines.
Wormholes can be time machines, but wormholes may not actually exist, because they require matter with (possibly) impossible properties.
Similarly, there is the "Tippler Time Machine" (goggle it---I'm not going to go into it here). This is also a hypothetical configuration of matter that can be used as a time machine. It too requires properties of matter that may be impossible.
It does seem odd that time machines are impossible only because of "material science"-type considerations. Travel back in time may therefore not be fundamentally impossible. It may be possible to "tunnel" back in time in quantum mechanics. This would happen most likely for small, simple particles, in situations where causality is indeterminate.
2007-07-13 07:21:55 · answer #2 · answered by cosmo 7 · 0⤊ 0⤋
Basic causality is a primary objection for the concept. There is also an entropy problem. For each orbit in phase space with dS/dt > 0, there exists only one with dS/dt < 0 between two points. If you could traverse time in reverse, you would gain absolutely nothing in doing so. Your path back and I suppose forward would not stray from the established causal reality of the future. You could not exploit knowledge of the future nor affect the past.
2007-07-13 09:19:17 · answer #3 · answered by jcsuperstar714 4 · 0⤊ 0⤋
Theoretically speaking, time traveling is possible when you put a black hole which sucks everything in and a white hole which pushes everything out. Join the two together will give you a time machine. But this is only a theory and cannot be done.
2007-07-19 16:19:30 · answer #4 · answered by Gaz T 5 · 0⤊ 0⤋
There's a problem with causality. Any change that takes place does so because of a cause. Imagine you go back in time to when you are born. Are there two of you now? Which one is the "real" one? What if you kill yourself in the past?
2007-07-13 07:13:54 · answer #5 · answered by Pfo 7 · 0⤊ 0⤋
It would require the time traveller to reverse the movement of the entire universe to find the exact position it was in at the time he wishes to visit. Obviously this is impossible to do.
2007-07-18 12:41:34 · answer #6 · answered by johnandeileen2000 7 · 0⤊ 0⤋
Lack of current technology, combined with a loose understanding of causality, and it's effects.
Anything with a non-zero probability has happened, somewhere in the universe. So someone is doing it.
Good luck.
2007-07-13 07:18:35 · answer #7 · answered by A Military Veteran 5 · 0⤊ 0⤋
Not really impossible, it is just that if you were able to change the past and came back to the present YOU would be the only one that would realize the change...
...to all the rest , what ever happened never really did for them.
2007-07-21 03:12:58 · answer #8 · answered by Captain Mozar 3 · 0⤊ 0⤋
One of the main logical problems is the so called "grandfather paradox". Suppose you could travel to the past, get to your grandfather home and kill him when he is a child. Then you will not born, so you get a contradiction.
2007-07-13 07:12:35 · answer #9 · answered by Jano 5 · 1⤊ 0⤋
If you'll go back in time a few months and log in again, you will see I already answered this.
2007-07-13 07:42:57 · answer #10 · answered by ghouly05 7 · 0⤊ 0⤋
possible maybe with the knowledge and equipment. but since we have neither we are back to impossible
2007-07-18 11:13:53 · answer #11 · answered by Anonymous · 0⤊ 0⤋