Time travelling is not posible :(

[Flamechy]

On different places with different speed the time is different.I saw professor Steven Hawking tell that.If we speed up enough we can move trough the time.Everyting will be slow to us and if we have enough speed we will disappear to the others.

[sanddbox]

On different places with different speed the time is different.I saw professor Steven Hawking tell that.If we speed up enough we can move trough the time.Everyting will be slow to us and if we have enough speed we will disappear to the others.

No, we can't. Speeding up can't revert all matter to a previous state.

[Bren2010]

sandbox, What he means is that if you speed up time will be slower to you, than it is to others at a normal or still pace. That's called Time Dilation.

i.e. If we both carry clocks that measure time exactly the same and are synchronized, then I speed up, I could say that your clock is moving too fast, and you could say mine is moving too slow.

[kijibwa]

Perhaps , I can try to clarify what Flamechy wrote.

On different places with different speed the time is different.

True ,time is relatavistic.

If we speed up enough we can move trough the time.

Proven. If we take two identical atomic clocks; one we leave stationary, the other clock, we fly it round the world
on a jet.
Then when the two are compared, the jet set clock will be found to be running a millionth of a second or so, behind the stationary one (Hafele–Keating experiment).

Everyting will be slow to us and if we have enough speed we will disappear to the others.

I'm pretty sure thats an episode of Star Trek.
Anyway:
There are several solutions to Einsteins General Relativity equations, that allow time travel.
One of which is; you get an iron cylinder roughy 10,000 miles long with a diameter of a thousand miles, rotate it
about its vertical axis, to approximately 80% the speed of light, and it will then form vortices of space-time
(much like the ripples of bath-water that form when you pull the plug out) at certain points along the cylinder,
these 'ripples' will aquire the mathematical properties that equate to going backwards in time.
Whether you could ride the rippples is another matter.

However General Relativity is not a complete explanation of the universe,
General Relativity cant explain how your phone works nor how any transistor works (quantum tunneling, it's cool!).
The equations of General Relativity just wont work with small stuff.
That's where Quantum Mechanics steps in, and does the math that makes your phone work.
But Quantum Mechanics wont explain the big gravity,space-time stuff. These two theories work on their own turf
but wont join together to form a coherent explanation of the universe.

So to sum up, General Relativity says time travel is possible, Quantum Mechanics has little to say about time travel,
neither theory is a complete explanation of the universe.
Without a complete or coherent explanation of the universe (space-time,entropy,etc).
The question of whether time travel is possible or not, is an open one.

Crikey, all that text just for no answer,don't ya just l ve science.

[Ovason]

it is so I posted this as the first message of the new year ages ago!!!

[ILL SLAUGHTER U]

I'm young therefore i dont know physics and the likes but any of those believers of time travel tell me: Why hasn't any one come back yet? Sure they may not want to but thats probably not why. I would also love to have a great debate with someone who thinks we have to progress in time first. Message me

[eljonto]

If they did come back, then they probably didn't tell anyone they came back so as not to cause a paradox and fuck up the future.

[faazshift]

Even something as small as a displaced rock or something can, over time, have massive implications. Anyone coming back in time would probably cause all sorts of paradoxes. I think matter works in a linear fashion. One thing affects the next thing, affects the next thing, etc. Thing 100 doesn't go back and affect thing 2.

[Ovason]

Thing 100 affects Thing two in Dr Seuss book "The Cat In the Hat"

Also, who is to say that there is an imperative to tell someone that time travel is possible.. Look at what happens to Marty in Back to the future...

The existence of dimensions has been proven, and because of dimensions, the possibility of time travel exists.

whether a rock or pebble is moved and causes a change, the possibility has already occurred and the probability that there is a dimension which reflects the change is, well, possible...

In other words, traveling through time is the same as traveling through space, and it has been proven.

Until time travel is dis-proven, it is Schrodinger's cat...

really though I still do the Bill and Ted 'test' every now and then... just to see if I will have time travel in my future...

Happy New Year!!

[Spectre557]

Here's a thought: If time travel were possible (going back in time anyway) then wouldn't there have been tons of travelers from the future by now? If, say, they discovered a way to in 2510, then from that time until the end of civilisation how many would there be? Surely at least a few would have made themselves known by now.