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I agree because you would be looking for someone that is currently looking into the future 15 minutes. Which I believe this owuld mean that it would be a never ending 15 minutes right. Like if you went ahead 15 minutes, to see yourself the other would be looking 15 minutes ahead. Because it is your own type of 'timeline' as you call it.

If time travel is even possible you could meet your future self because were all pass selves. The future self goes on infinitaly.

It is still snowing.

Ummm.... What does that have to do with time-travel? Anyways, the way I see it is that if you went fifteen minutes into the future, your future self would be trying to meet itself from fifteen minutes into the future, and that future self would be trying to meet itself from fifteen minutes into the future, and so on. It's a very long and sort of confusing chain, so with the way I think of it, you'd never be able to meet your future self. Hmmm, maybe this should just be a thread for random time travel paradoxes that people come up with... Yeah, that'll work!

EDIT: Oh wait, Mp)7-7 already said what I thought about it... D'oh!

Exactly. The math involved behind travelling into the past is so extreme, that even god it's self may not even be able to do it.

Thats funny that someone thought of that too, because even when I thought this, I wasnt planning on writing it because it even seemed wierd to me. But then I thought, and it makes a little sence as bizarre as it is.

It's been proven that faster your moving the slower time goes.

Example?

TO all those who don't think that time travelling is possible:

What about the "nuclear clock on a plane" experiment?

I have never heard of this experiment.

They took a nuclear clock, and put in on a plane. The plane was flying in the air for quite some time. As we all know, the faster you move, the slower the time flows for you. So the nuclear clock that was on the plane was behind the other nuclear clock that was on the ground after it was returned to the ground.

So what your saying is that a pilot ages faster than a normal person that only rides a plane two to three times a year. I dont know what a nuclear clock is.

About the nuclear clocks:
This was an experiment to prove Einstein's theory of time dilation.

I'll keep it simple, check out "time dilation" on wikipedia or whatever...

The faster an objet moves relative to an observer, the slower time passes FOR THIS object IN THE VIEW of the observer. If you are moving at high speed, you don't feel any difference, because you are not moving at all relative to yourself.

But this does only SLOW DOWN time, and will eventually stop it (see photons), but never turn the flow of time.

Gravitation does also slow down time (actually it's pretty much the same thing), which is why a black hole seems not to collapse anyfurther out of our view, while in fact only time is not flowing for that black hole out of our view.

On topic: What would happen if you killed any of your ancestors?
Well, we only are a set of atoms. If we go back in time, we are a set of atoms in that time (don't ask me where these atoms should come from all of a sudden, time travel is impossible...). I could kill anyone in that time; what should affect my atoms to vanish?

I have another question, much nicer: The universe expands; this means that there is an end to it (which we can't reach because it expands with the speed of light). But what's outside the universe?

The time going slower as you go on was the nuclear clock on a plane expirement. I think they tested this more than once, but a nuclear clock doesnt really go off. The person that was flying can always say im .0000001 second younger than my actual date. You have to be going extremely fast for you to actually slow down enough to go into the future.

Could we get a link to some sources (time dilation experiments)? This sounds interesting. To spinesheath: Outside the universe is another universe, but so far away that we would never reach it, even if we were constantly on the edge of the universe. The stuff that fills the area between is dark matter. Yay for my weird theories with no research done to prove them.

Yes. However, the point of zero time is at the speed of light, which is unattainable for objects with rest mass (such as people and people's spaceships). So this isn't a viable way of getting back in time (although it can help getting forward, provided you don't mind traversing the interim). For going back in time, you'd have more luck trying wormholes and quantum physics.

The pilot ages slower than the person on the ground. This is provided the Earth is at rest, of course; as it is the pilot could actually be slowing himself down by flying west and gaining on the stationary person.

An atomic clock is a clock that records time based on the innate resonance frequency of an atom. The most commonly used element is cesium.

Yes, yay for them. Unfortunately, our universe contains all the three-dimensional space we know. To get to another universe, presumably you would have to get out of our plane of space somehow. Think of it in terms of a terran civilian who is trapped within his StarCraft game. He can walk anywhere on the map but he won't get into another game. You would need some extra programming to get him from one universe to another (yes, a StarCraft game is a miniature simulated universe).

Nice example. I still want a source of information regarding the experiments done with the plane and nuclear clocks, though.

As I already mentioned, look it up in wikipedia. It's not really a reliable source, but for your purposes, which are not really scientific, it's good enough You'll find all the links to connected topics there.

Dark Matter is not necessarily only outside our universe. We can't tell what is outside, but at least we know that there is dark matter INSIDE our universe. That's how it is defined; some sort of matter that we cannot detect except for its gravitational effects yet but that exists in our universe.

Let's be precise: The pilot slows himself down OUT OF THE VIEW OF OTHERS. And it's terribly complicated to prove that the pilot is the one that is younger when he meets his twin brother after his flight, and not his twin brother, when his twin brother was moving relative to the pilot just as well...
Keep in mind: Movement is relative! When I am moving, but look at me relative to myself, I am not moving. I could also say that the earth is turning below me when I am walking...

Wormholes are - from what I read so far - more of a connection of places that are far away, caused by deformation of space (dunno how it is actually called in English, the thing caused by gravity). But that's nothing but a shaky theory

Does this change in time happen enough for if someone did an experiment and stayed on planes for like a whole year just going on planes everyday only stopping to eat actual meals. Would they become noticely younger or older?

That is correct. It is usually called 'curving' or 'warping' of space. And to make it into a time machine, you build a very massive spaceship (or use a spaceship to tow a very massive object, pretty much the same thing in practice) and move it close to the wormhole, then fly around the other end of the wormhole. According to certain interpretations of relativity and the way wormholes work, the resulting twisted wormhole would allow you to go back in time, however you would not be able to go back any farther than the time at which the wormhole was made.

The relativity equation is 1/((1-((v^2)/(c^2)))^0.5), or, in proper notation:

So the rate at which the dilation changes compared to speed is not constant but rather increases as the speed increases.

Now, let's use this calculator to find out whether your idea would work. We'll assume the plane moves at 900 KPH, which is about cruising speed for many commercial airliners, and the person on the ground is at rest. And we'll assume that the person flying in the airplane flies 24/7 for a whole year. Plug in 900 KPH and you get a dilation of 1.0000000000003477. The amount of a year less the person will age is therefore 1/1.0000000000003477, so the person ages about one hundred thousandth of a second less. This scales directly with the amount of time spent in the airplane, so if you lived for 90 years you would still age only a thousandth of a second less than the person on the ground. If we assume that five years' age difference is necessary to make a noticeable change, then by the time you got off the plane, you would have been on it for about 14380212827154 years, or about 1000 times the age of the Universe.

Good luck on marketing your new anti-aging treatment! XD

Wow, then why is this such a big deal that people notice tht your age changes a little while flying if it only changes by that much?

Because it's interesting that time flows slower in high speed than if it is still.

I remember there was an Albert Einstein theory to this

http://en.wikipedia.org/wiki/Time_travel

On this show it said that if 2 kids that are exactly the same age of Ten and one of them goes into a Space shuttle that can travel at the speed of light and the other stays on earth if the kid in the shuttle goes around the earth I think it was 100 times when he comes back to earth he would be 14 and the other one would be 72! But I personally don't see how a person can go back in time because that would require doing the same thing but backwards.

If you traveled the speed of ligt and went around the world 100 times, this would only take seconds to go around the world that many times, how would the other kid gain 62 years?