The general theory of relativity extends the special theory to cover gravity, illustrating it in terms of curvature in spacetime caused by mass-energy and the flow of momentum. General relativity describes the universe under a system of field equations, and there exist solutions to these equations that permit what are called "closed time-like curves," and hence time travel into the past. The first of these was proposed by Kurt Gödel, a solution known as the Gödel metric, but his (and many others') example requires the universe to have physical characteristics that it does not appear to have. Whether general relativity forbids closed time-like curves for all realistic conditions is unknown.
As another answer mentioned, the evidence we have does not show the Universe has the characteristics needed for the space-time curvature functions (Godel's idea) to permit time travel.
If time travel is possible, where are all those tourists from the future exploring history now and in the past? Well, we have never identified one of them, but that could be because time travelers are not allowed to change the past ... and even being discovered would clearly do that.
No. Time travel is not possible. Time travel will never be possible. If time travel ever *were* to be possible, we would already have had visitors from the future. Since we have not had visitors from the future, that can only mean that time travel will *never* be possible.
Events are happening all the time - how do you know some of them aint being caused by "time travelers" to create or ensure they get (by influencing the actions of others) the future they want?
(I'll give a crazy example
When kennedy was shot there was speculation of somebody on the grassy knoll - maybe they were a time traveller
Also - In some of the film/photos of the shooting the closest bystander to kennedy when he was shot was dressed as a woman (maybe it was a man dressed as a woman) - though there were extensive enquiries this person was never traced - maybe they were a time traveler)
Yes in one course: the long run. To take action, you want a very quick spaceship which will journey to a vast fraction of the speed of light. You're going to experience time contraction alongside the following components t' = root (1 -v^2/c^2)*t where t' is the time you expertise t is the time experienced by way of a stationary observer (e.G earth) v is your speed c the pace of light. For instance if you were to travel at 10% of the speed of sunshine, you could possibly expertise a time contraction of ninety nine.498% not very impressive. But at 50%, time contraction can be 86.60% at ninety%, it might be 43.Fifty eight% at ninety nine%, it will be 14.10% at ninety nine.9%, it would be four.47% So if you happen to would get a spaceship to arrive 99.9% of the speed of sunshine, and preserve this velocity for 4.Forty seven years, to your return to earth one hundred years would have long past by way of. Fly for forty four.7 years, and are available back to earth a thousand years later. So in precept you can travel forward in time. Virtually there are some snags. With growing velocity , identical to time contracts, your mass augments in the same proportion (e.G. If time runs 10x slower, your mass is 10x bigger. So as to expertise the identical drive in your seat, you may need to scale back your acceleration because your mass increased (consider F=ma). Additionally it will come to be increasingly complex to move at those speeds and typically your body would endure critical trauma (for instance each heartbeat would require so much extra vigour).
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The general theory of relativity extends the special theory to cover gravity, illustrating it in terms of curvature in spacetime caused by mass-energy and the flow of momentum. General relativity describes the universe under a system of field equations, and there exist solutions to these equations that permit what are called "closed time-like curves," and hence time travel into the past. The first of these was proposed by Kurt Gödel, a solution known as the Gödel metric, but his (and many others') example requires the universe to have physical characteristics that it does not appear to have. Whether general relativity forbids closed time-like curves for all realistic conditions is unknown.
As another answer mentioned, the evidence we have does not show the Universe has the characteristics needed for the space-time curvature functions (Godel's idea) to permit time travel.
If time travel is possible, where are all those tourists from the future exploring history now and in the past? Well, we have never identified one of them, but that could be because time travelers are not allowed to change the past ... and even being discovered would clearly do that.
No. Time travel is not possible. Time travel will never be possible. If time travel ever *were* to be possible, we would already have had visitors from the future. Since we have not had visitors from the future, that can only mean that time travel will *never* be possible.
Think about it.
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follow your answer a bit further "birchard"
Events are happening all the time - how do you know some of them aint being caused by "time travelers" to create or ensure they get (by influencing the actions of others) the future they want?
(I'll give a crazy example
When kennedy was shot there was speculation of somebody on the grassy knoll - maybe they were a time traveller
Also - In some of the film/photos of the shooting the closest bystander to kennedy when he was shot was dressed as a woman (maybe it was a man dressed as a woman) - though there were extensive enquiries this person was never traced - maybe they were a time traveler)
Yes in one course: the long run. To take action, you want a very quick spaceship which will journey to a vast fraction of the speed of light. You're going to experience time contraction alongside the following components t' = root (1 -v^2/c^2)*t where t' is the time you expertise t is the time experienced by way of a stationary observer (e.G earth) v is your speed c the pace of light. For instance if you were to travel at 10% of the speed of sunshine, you could possibly expertise a time contraction of ninety nine.498% not very impressive. But at 50%, time contraction can be 86.60% at ninety%, it might be 43.Fifty eight% at ninety nine%, it will be 14.10% at ninety nine.9%, it would be four.47% So if you happen to would get a spaceship to arrive 99.9% of the speed of sunshine, and preserve this velocity for 4.Forty seven years, to your return to earth one hundred years would have long past by way of. Fly for forty four.7 years, and are available back to earth a thousand years later. So in precept you can travel forward in time. Virtually there are some snags. With growing velocity , identical to time contracts, your mass augments in the same proportion (e.G. If time runs 10x slower, your mass is 10x bigger. So as to expertise the identical drive in your seat, you may need to scale back your acceleration because your mass increased (consider F=ma). Additionally it will come to be increasingly complex to move at those speeds and typically your body would endure critical trauma (for instance each heartbeat would require so much extra vigour).
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so in theory traveling to the future is possible, but as of now nobody has thought of how to get back to the past
No but It would be cool