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Is Time Travel Possible By The Effect Of Time Dilation?
Nov
23
2009
A proposed time-travel machine using a wormhole would (hypothetically) work something like this: A wormhole is created somehow. One end of the wormhole is accelerated to nearly the speed of light, perhaps with an advanced spaceship, and then brought back to the point of origin. Due to time dilation, the accelerated end of the wormhole has now experienced less subjective passage of time than the stationary end. An object that goes into the stationary end would come out of the other end in the past relative to the time when it enters. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backwards in time. A time machine will be built someday, but hasn’t been built yet, so the tourists from the future can’t reach this far back in time. Creating a wormhole of a size useful for macroscopic spacecraft, keeping it stable, and moving one end of it around would require significant energy, many orders of magnitude more than the Sun can produce in its lifetime. Construction of a wormhole would also require the existence of a substance known as “exotic matter,” or “negative matter”, which, while not known to be impossible, is also not known to exist in forms useful for wormhole construction.Microscopic wormholes could still be useful for sending information back in time.
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Answer #2
Time travel is not possible by any means. So you are on a space shuttle going very fast & times slows down by 1/100,000,000th of a second.. Now “in theory” it stands to reason that the faster you go, the slower time goes. There are many flaws with this theory. The obvious one is the human body is under great strain going just a few times the speed of sound. Another is there is no proof that the cells in your body will age less just because you are going faster & relevent time is going slower. You can not go beyond the speed of light because once you reach it, any faster will just convert the extra energy into mass, slowing you down to the speed of light again. In theory anything is possible but not in reality. To break the laws of physics you must break the human body down to a sub atomic level, where the laws no longer apply. This is where science turns into science fiction. Scotty will never be beaming any living thing up. There may be a day when say a plastic comb (with mass but no energy) can be broken down into to a sub atomic level & sent to another place or time. A human on the other hand (where matter & energy are sharing the same space) will never see this day, because you may send the matter to another time but the energy will remain, leaving your corpse in the year 1850.
Answer #3
Well, you are travelling through time now, in a forwards direction, and time dilation will certainly change the rate at which you do it compared to someone in a frame moving with respect to you. But though sumultaneity fails in relativity, event order is preserved and hence there is no way to go back in time. Only by being able to go back can you be meaningfully be said to be able to time travel.
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Answer #1
Technically yes, but you only get to go forward more slowly. You still can’t go back. If you spent a year of your time going very close to the speed of light, and then stopped, thousands of years may have passed on Earth in the meantime. But you can’t go back.