someone told me that if we travel faster than the speed of light then we travel in the future? do u think this is true? is there any theory on travelling in the past?
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Time Travel into the future is possible. If Free Will exists, then time travel into the past is not possible, IF there is only one universe. But, some versions of Quantum Mechanics proposes multiple universes. Multiple universes are possible, then time travel to the past is also possible. Though any change made in the past results in living on a different timeline. (Example of the fun you can have with this: Solution to the “Grandfather Paradox,” If you go back in time it is impossible to kill your grandfather. Every time you try the gun mis-fires and you stay on a timeline where your grandfather lives. See:
http://en.wikipedia.org/wiki/Grandfather…
http://science.howstuffworks.com/science…
Two Time Machines for travel into the future:
Type 1
Build a space ship capable of near light speed. Put it into a long orbit like a comet that returns to earth every 100 years. Get in the ship and blast off. When you return you will have aged a few years and be 100 years into the earth's future.
Type 2
Build a space station in near orbit to a Black Hole. As long as you are in the space station you age very slowly. When you leave you could be 100s of years in the future.
Special and General Relativity makes either of these possible. The science is solid, the engineering will take some work.
Time Travel into the past:
The possibility of travel to the past hinges on: Does Free Will exist? If we have Free Will then we can change the past and thus the present. The Law of Causality does not allow this. All time travel paradoxes arise from the fact that causality does not allow us to change the present. But, IF everything is fixed and we can’t change it, then some of us, at least, could be time travelers caught in a loop stretching enough years to cover a life time or more maybe 1000s of years. Time Travel need only involve “quantum leaps” that prevent us from meeting ourselves and we live the same lives over and over with no memory of the last time we did it. Something like Joe Haldeman’s “The Accidental Time Machine” would work.
http://en.wikipedia.org/wiki/Grandfather…
http://science.howstuffworks.com/science…
Two Time Machines for travel into the future:
Type 1
Build a space ship capable of near light speed. Put it into a long orbit like a comet that returns to earth every 100 years. Get in the ship and blast off. When you return you will have aged a few years and be 100 years into the earth's future.
Type 2
Build a space station in near orbit to a Black Hole. As long as you are in the space station you age very slowly. When you leave you could be 100s of years in the future.
Special and General Relativity makes either of these possible. The science is solid, the engineering will take some work.
Time Travel into the past:
The possibility of travel to the past hinges on: Does Free Will exist? If we have Free Will then we can change the past and thus the present. The Law of Causality does not allow this. All time travel paradoxes arise from the fact that causality does not allow us to change the present. But, IF everything is fixed and we can’t change it, then some of us, at least, could be time travelers caught in a loop stretching enough years to cover a life time or more maybe 1000s of years. Time Travel need only involve “quantum leaps” that prevent us from meeting ourselves and we live the same lives over and over with no memory of the last time we did it. Something like Joe Haldeman’s “The Accidental Time Machine” would work.
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