A Conversation for Talking Point: Time Travel

Of course it's possible...

Post 21

PhysicsMan (11 - 3 + 29 + 5 = 42)

OK. To sum up: Traveling to the future is easy; you're doing it right now. To travel forward at a faster rate, all you need to do is manipulate relativity to your favor. So, traveling to the future is (relatively) easy.

Traveling to the past is the challange. All the "reasonable" theories I've heard involve building huge, impossible structures, like wormholes or columns of neutron stars or whatnot. However, all of these theories state that you can only go back to when the machine was first made, so that takes care of that.

As far as consequences: If we live in a universe with free will and only one universe, then time travel is impossible. However, if there is no free will, or an anthropic situation, this would make time travel possible, as you could never change the past. Also, if there were more than one dimention, then you could just mess up the past of the other dimention and not cause any major problems. Of course, this leads to countless other problems, but those could be dealt with at the time.

BTW: The article here - http://www.bbc.co.uk/dna/h2g2/alabaster/A662447 - which I'm editor of, is about time travel.

PhysicsMan


Of course it's possible...

Post 22

BuffySquirrel

Okay, it's probably because I'm too lazy to read the article, but I'm confused by this 'you can only travel to the past within the lifetime of your time machine' argument. I can see how this applies if your travel is in some way dependent on the continuing action of the machine. But what if it's like the difference between powering an airplane on earth and powering a spaceship in flight? You have to apply continuous power to the aircraft because of gravitational and atmospheric effects, but a spaceship needs only one kick and it keeps going, because of the absence of those very effects. So if you were able to design a time machine that gave you an initial kick, after which you would just keep going ... couldn't you then travel outside its lifetime?

The immediate problem that springs to mind however I suppose is 'how would you stop?'.


Of course it's possible...

Post 23

PhysicsMan (11 - 3 + 29 + 5 = 42)

I think it makes more sense to think of a time machine in terms of a doorway rather than a spaceship. With the time machine, you can walk from one point in time to another, but you can only go to a time where the doorway existed.

PhysicsMan


Of course it's possible...

Post 24

Peet (the Pedantic Punctuation Policeman, Muse of Lateral Programming Ideas, Eggcups-Spurtle-and-Spoonswinner, BBC Cheese Namer & Zaphodista)

Ok, so here's the plan.

1) Figure out a phenomenon which would allow you to travel outside the mundane restrictions of space-time.

2) Search for a natural occurrence of that phenomenon which has been around for a *long* time.

smiley - scientist = smiley - magic = smiley - ok


Of course it's possible...

Post 25

BuffySquirrel

We're back to those black holes again, aren't we?


Of course it's possible...

Post 26

Peet (the Pedantic Punctuation Policeman, Muse of Lateral Programming Ideas, Eggcups-Spurtle-and-Spoonswinner, BBC Cheese Namer & Zaphodista)

Or rotating superstrings... smiley - nahnah


Of course it's possible...

Post 27

BuffySquirrel

smiley - headhurts

Aren't those still theoretical?

Still ... the thing about space is, it's black. And the thing about a black hole is, it's black ...


Of course it's possible...

Post 28

Ace Rimmer [pretending]

And the thing about a scanner scope...
Hope you don't mind if drop by.smiley - cool


Of course it's possible...

Post 29

BuffySquirrel

No problem, Arnie.

Just sit yourself down over there behind that man-eating plant.

Don't worry, it's not developed a taste for holograms. Not yet anyway ...


Of course it's possible...

Post 30

Ace Rimmer [pretending]

Thats comforting...


Of course it's possible...

Post 31

BuffySquirrel

Oh and while you're there, don't forget to give it some heavy water ...


Of course it's possible...

Post 32

Ace Rimmer [pretending]

Smeg off!


Of course it's possible...

Post 33

Ace Rimmer [pretending]

I just asked someone if it's possible to become your own dad by going back in time, he said no, what do you think?


Of course it's possible...

Post 34

BuffySquirrel

Umm.

It's difficult to know to which aspect of this question the person you asked was actually saying 'no'. If they don't think it possible to travel back in time, then they might not even have considered the other part of the question.

This question might be better-phrased as 'if it were possible for a man to travel back in time, could that man become his own father?'

I have to admit that, looking at the question that way, I don't see why not, provided his mother was willing! Although given my stance on the whole time-paradox thingy, this would only be possible if he _already was_ his own father.

Stop this now! smiley - headhurts I implore!


Of course it's possible...

Post 35

Ace Rimmer [pretending]

Clearly that he belived in time travels.
Alright, now I'm not trying to mess with your head but...
Would it be possible to prevent yourself from actually existing by preventing your parent, from ever meeting, without stopping yourself from not being able do do it.
Can I have some of your aspirins please...


Of course it's possible...

Post 36

Ace Rimmer [pretending]

OK, so I confused it a bit, hope you understood anyway...


Of course it's possible...

Post 37

Bluegerbil

If/when the ability to accelerate (-ve/+ve) through time is discovered might it not be the case that travel to a time earlier than the dicovery of the technology, depending of course on how that technology manifests itself, would not be possible?

In this case, should we be capable of tt in our lifetime (it would be dull if we weren't) then our children, if born after date of time travel (dtt) could come back in time and warn us of the risk of having children. We could of course accelerate ourselves until the little blighters are dead.

Ah But ... what if the kids accelerate themselves at the same rate we do? ... simple ecconomics prevents this. I have a larger bank account than they do and can afford the Version 2.6 accelerator way before they can.


Of course it's possible...

Post 38

BuffySquirrel

Well you know Arnie, this is one of those time paradox thingies to which I was referring.

Person A invents a time machine, goes back in time and kills his father (Person B) before Person B has had chance to father him.

Person A therefore never comes to exist.

Person A therefore cannot go back in time to kill Person B.

Person B therefore lives to father Person A and Person A comes to exist.

Now he exists, Person A can invent the time machine, go back in time and kill Person B.

And so on until mere aspirin will not serve.smiley - headhurts

This paradox is normally resolved by declaring that it is therefore impossible to travel back in time. Or you could resolve it by deciding that it's possible to travel back in time but not possible to prevent your own birth that way - something would occur to prevent it.

Did you ever pass that Navigation Exam btw?


Of course it's possible...

Post 39

Peet (the Pedantic Punctuation Policeman, Muse of Lateral Programming Ideas, Eggcups-Spurtle-and-Spoonswinner, BBC Cheese Namer & Zaphodista)

But once you start they can wait for the price to fall on the 3.0 beta release, then catch you up... smiley - nahnah


Of course it's possible...

Post 40

Ace Rimmer [pretending]

I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish I am a fish.
Almost.
PS.What the smeg is Peet talking about?


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