Time travel paradoxes

What about the Terminator paradox?

If John Connor is the son of Kyle Rees and John Connor sent Kyle Rees back in time.

How did John Cononr exists in the first time before he sent Kyle Rees back?

It is like the chicken and the egg question !
 
wannabedamned said:
If you have something travelling at the speed of light, and you have something with in that object move forwards. Then that would essentially be travelling faster than light.

Saw it on a TV program about Stephen hawking theories :D
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Amleto said:
That is exactly how it doesn't work...
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Indeed. It doesn't work like that.

If the person on the train jumped/ran/dived forward whilst it was going at 99.9999999% the speed of light.

The train and everything else around them would slow down so it all equaled out.

Watch the documentary again ;)
 
Angilion said:
For example, I have two lamps in this room. Each is emitting light in all directions. They're not in the same place. There is, therefore, some light travelling from lamp A in the direction of lamp B and some light travelling from lamp B in the direction of lamp A, i.e. there is light travelling in opposite directions. If two things are travelling in opposite directions, then their speed relative to each other is the speed of each added together. So by that argument the light from each lamp is travelling at twice the speed of light.
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That's like saying two cars approaching each other on a motorway doing 70mph are doing 140mph relative to each other and so then they must be doing 140mph each. That makes absolutely no sense, you can't just say 'speed relative to each other = absolute speed of each object' :p
 
leezer3 said:
Time travel is the more interesting one TBQH, that all depends on what you consider time to be. If we take the classic grandfather paradox (The first post is just rehashing of that), then in my opinion, the most likely outcome would end up being a branching timeline.

By this, the assumption I'm most comfortable with is that time is a basically linear thread, constantly unspooling. Now, if we go back and look at, or for that matter interact with this point, but the end point always remains where we are, and the newly created timeline then branches off into *somewhere*.
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I'm with you on this one (I think)

If I went back in time and killed my grandfather, time (from my perspective), would continue on with the exception that the younger me wouldn't be born. The man that should have been my Grandfather will still be dead, I would still be wandering around in the world/timeline somewhat older than previously as in the year I was supposed to be born I'd now be 20, 30 , whatever years old. Me not being born in that timeline would have no effect beyond my recollection of certain events may be different.

Perhaps a little like dropping a pebble into a pond, the effects of the change would be marked (from my perspective) where it happened i.e. my not having been born being a huge difference, my parents living somewhat different lives, friends being effected "a bit", random Jo public possibly not effected at all, the rest of the universe not even blinking at the absence of my old self.

Here's one for you, it's entirely possible that assuming the whole premise of the question is possible, the only reason you are alive and posting here is because someone went back in time and killed their grandfather, subsequently giving rise to a family line that now includes you but from there perspective never should have. :D

Right, I need some alcohol, to take this discussion any further. Sun? Check!, Friday Afternoon? Check!, Pub garden? On my way!! :D :)
 
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Chris [BEANS];22533706 said:
?? No it isn't??
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The closer you go to the speed of light the faster time passes. So if we could build something really fast we would already have a time machine. The effect has been proven and is why the clocks on the GPS system have to be changed all the time or something. I dunno, but it exists. For you to actually go far into the future you would need something really fast like a space ship really.
 
The real question is has anyone really been far even as decided to use even go want to do look more like?
 
You’ve got to be kidding me. I’ve been further even more decided to use even go need to do look more as anyone can. Can you really be far even as decided half as much to use go wish for that? My guess is that when one really been far even as decided once to use even go want, it is then that he has really been far even as decided to use even go want to do look more like. It’s just common sense.”
 
Athanor said:
You’ve got to be kidding me. I’ve been further even more decided to use even go need to do look more as anyone can. Can you really be far even as decided half as much to use go wish for that? My guess is that when one really been far even as decided once to use even go want, it is then that he has really been far even as decided to use even go want to do look more like. It’s just common sense.”
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:p
 
starfighter said:
The closer you go to the speed of light the faster time passes. So if we could build something really fast we would already have a time machine. The effect has been proven and is why the clocks on the GPS system have to be changed all the time or something. I dunno, but it exists. For you to actually go far into the future you would need something really fast like a space ship really.
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Chris [BEANS];22527645 said:
I see where you're coming from when you say:-



but that isn't really the case.
The faster you travel the slower time advances relative to you and so once you slow down again it may 'appear' as though you have travelled into the future, but really you've just slowed time relative to you.

As for travelling faster than light, although there are phenomena that can effectively affect distant paired particles instantly (ie, the effect occurs more quickly than it would take light to travel between the two particles), this is at a quantum level and is a physical impossibility on a large scale.



(Disclaimer, I am not even remotely educated and the above is my poor understanding of things I've read so may be completely wrong)

I'll keep an eye on this thread for the clever peoples responses :)
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But that isn't time travel, that's time slowing relative to you, 'IF' you can travel fast enough.
Even if that could be considered time travel, we as humans can't travel anything like fast enough to do that to a significant degree.
 
Morbius said:
It's speculated that a positron could be an electron travelling backwards through time.
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One things that's been of great interest to me lately is for things along the lines of this.

I think our human experience/perception of time has a drastic effect on how we perceive time and subsequently how that effects our interpretation of physical principles.

Just because we perceive it in a certain way (ie, a relatively linear duration that can appear to be affected by external reference frames), doesn't mean that's how the main body of the universe "perceives" it.

Our brain interprets it almost like a computer in terms of frames per second... we see many snapshots per second as that's how our brain interprets and converts the information.

It's extremely hard to get out of this method of thinking, even Einstein struggled.


One other thing about how we interpret the universe that's wrong... "Solid" matter is actually more empty than populated, significantly - on similar scales to the solar system/galaxies... we can't see/interpret this as our brains have no need to interact with our surroundings at that level.





I wish more people could look past our very simple, infantile experience of the universe.
 
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