Time travel is possible

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Time can expand and contract, but you can’t make it go backwards or skip it. That’s relativity.
 
Tim_D said:
It isn’t so much that the astronauts traveled “forward” into time but that their relationship to time was relatively different than those of us on planet Earth. One cannot go to an event that has not yet occurred, just as one cannot go back to an event that has already taken place.
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I disagree - we just have not reached a velocity and sustained that velocity for a period of time that would make a difference - yet to be done - but the 7 microsecond delay for satellites due to time dilation proves Eisenstein theory to be true - it does not come from me - its Albert Einstein ideas and it has been proven - read about it.

Special relativity
 
hu324b said:
I disagree - we just have not reached a velocity and sustained that velocity for a period of time that would make a difference - yet to be done - but the 7 microsecond delay for satellites due to time dilation proves Eisenstein theory to be true - it does not come from me - its Albert Einstein ideas and it has been proven - read about it.

Special relativity
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To be able to reach that velocity would require speeds close to the speed of light itself, something that cannot and will never be done. Just because something is theoretical doesn’t mean that it is applicable.
 
Gravitational fields can influence the inertial reference frame. Astronaughts in orbit or travelling near a more massive object would experience relativistic effects, noticeable if not huge. Conventional travel to our nearest neighbor would also cause noticeable relativistic effects. I see no reason to treat it as a forever impractical thought experiment.
 
Gertabelle said:
Guess the ball is in your court, Psych.

Ready.
Set.
Explain!

😃
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I’m done! 😃

en.wikipedia.org/wiki/Chrono_Trigger

(But really, from the point of view of this thread, the game to play is Trigger’s sequel, Chrono Cross, which raises all sorts of disturbing implications about the morality of “changing the past” or “changing the future”. If we consider that everything - even the greatest evils, such as abortion or the Holocaust - is somehow part of God’s plan, then imagine what the alternatives would have been like… :eek:)
 
IWantGod said:
If you can devise a means of slowing the expansion of a particular part of space and matter, then the rest of space and matter will expand faster relative to the space and matter you have slowed down. Once you have return space and matter to its normal rate of expansion you will find your self in the future.
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  1. If the observer is in the region of slowed space/matter, even when this region of space/time returned to its normal rate of expansion, the observer does not “enjoy” additional knowledge due to slowed space/time because he is part of the slowed space/time.
  2. The observer in the non-slowed space/time region does not gain any special advantage of knowing more about the slowed space/time region because that region only “aged” slower than the rest of the normal region. So there is no additional information derived. The hare must wait for the tortoise to know what the tortoise will be doing next. You can’t go back and kill off Hitler or grandpa.
  3. Even if one could travel to the future, going back to the past to tell on them may not be possible because that would require traveling faster than the speed of light i.e. you need to double back. For the observer in the normal space/time to inform those in the slowed space/time about events in the normal space/time region, he has to overcome the speed of light in his region to get to the region that is happening slower.
Conclusion: Not possible in any meaningful way.
 
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