Law1 min ago
The answer to time travel?
Forgive me if you think i'm crazy, i think i may have cracked Time Travel subject to a few theories which could well be wrong.
If it were possible for Nasa to put a spaceship into orbit and accelerate constantly, would this ship eventually not speed up to the point where it would be travelling faster than the speed of light hence travelling back through time, and if the ship could then land before it actually took off????
Answers
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For more on marking an answer as the "Best Answer", please visit our FAQ.As proved in 'King Arthur and the Spaceman', travelling close to the speed of light will take you back in time....
The phenomenon with the clocks, people are referring to is again relative. The one that has travelled, has aged less than the other, and therefore nows exists in the past (relative to the stationary clock).
No, I wasn't drunk, what I was trying to illustrate with my ferging and farging is what I consider to be one of the hardest nuts to crack in science/philosophy: the ACTUAL relationship between the terms we use and the actual thing to which they refer. Example: time. Everyone (ish) before 1900 believed that it really referred to a real thing worth talking about. Now we know that the real thing is probably spacetime.
Relativity dictates that it is difficult to find things to talk about independently of other things. Eg. oh, let's say if my mass was x, what would my speed be if I added energy z? Well, your mass changes with speed, etc etc. So my problem is that we talk of speed (ie of light) as the one thing that is absolute, but to me it seems that speed, within the confines of our description, derives its meaning from time....and space. So does this mean that when you put together two things that are relative like that you get an absolute? Or is it because it's a property of light, ie energy. Which travels. Just trying to fix this all before I start indulging in a bit of light bbc docuscience watching...
Pinotage, that's the old chestnut...they may be around you, LOL. Best answer I heard so far is that you can come back, but only to a time when time machines already exist. And delorians also probably...
If two spacecraft speed towards each other at half the speed of light, (possible in theory!)
then they are relatively approching each other at the speed of light.(impossible!).
Actually, if one thingy is travelling eastwards at half the speed of light, and a second thingy is travelling westwards at half the speed of light, the speed of the two thingies relative to each other will be only four-fifths of the speed of light.
but on a serious note, if you were to tie a person / space craft to a piece of rope and start rotaing it about a point at a constant speed, as you increased the length of rope the velocity (angular velocity) at which the person is travelling would increase , therefore, if you had an infintite length of rope you would, and you constantly increased its length you would get to a point where the person will be travelling at an angular velocity exceeding the speed of light.
Well
but on a serious note, if you were to tie a person / space craft to a piece of rope and start rotaing it about a point at a constant speed, as you increased the length of rope the velocity (angular velocity) at which the person is travelling would increase , therefore, if you had an infintite length of rope you would, and you constantly increased its length you would get to a point where the person will be travelling at an angular velocity exceeding the speed of light.
Well
thebut on a serious note, if you were to tie a person / space craft to a piece of rope and start rotaing it about a point at a constant speed, as you increased the length of rope the velocity (angular velocity) at which the person is travelling would increase , therefore, if you had an infintite length of rope you would, and you constantly increased its length you would get to a point where the person will be travelling at an angular velocity exceeding the speed of light.
Well
the theory is sound