# One of the effects of approaching the speed of light is that time is altered. If

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relativelycuriousposted 8 years ago

One of the effects of approaching the speed of light is that time is altered. If FTL were...

achieved by warping the fabric of space and time, what would be the effect on time. For example if one were to travel one light year and back by warping space/time how much time would have passed at the place that the journey originated from?
Would it be less time than was recorded by those that took the journey?

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rebekahELLEposted 8 years ago

I can't help you with the answer to this question other than refer you to a hubber who is a physicist who works at CERN, perhaps you can send him a mail with your question. it's a fascinating question.
http://hubpages.com/profile/Professor+Eric

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1701TheOriginalposted 7 years ago

Hi there relativelycurious, I am sorry it took me so long to respond to your question. Hypothetically, if space is warped then the distance between two points is shortned by a measurable quantity. It essentially acts like a wormhole, but in this case you must provide the space warp yourself. Relativistic effects would still take place despite crossing the distance with this short cut, but the effects will be less significant. You won't think only a month has passed while it has been in fact a year, but the time difference will be measurable.

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Manna in the wildposted 5 years ago

Warping space and claiming FTL makes no more sense than having a foot-race with your mate and finding a short-cut while sending him the long way around.

However, even without warping space, when you travel fast, then your perception of time is not altered while an observer in a stationary frame of reference witnesses your clocks slowing down. From your perspective. distance appears to shrink but those you leave behind appear to go into fast-forward. This has the happy consequence of theoretically leaving Earth for the stars, accelerating to near c, decelerating and arriving in a comparatively short time from YOUR point of view. But the unhappy result that if you went home again, you would probably be greeted by your great great great great great great grandchild. (Depending on how fast and far you went).

In practice, getting near the speed of light takes a ridiculous and impractical amount of energy, and an unreasonable length of time (even in *your* frame of reference as you travel) to accelerate to top speed, and again to slow down.

When you calculate how much fuel is needed to do this acceleration, it's clear that some exotic energy source is also needed otherwise you start off with a stupidly high mass of fuel.

It just ain't practical.

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