Time Travel? possible?

[incognito]

Last I read, it would take 100 billion years and 100 quadrillion dollars to make 1 gram of anti-matter with the current methods and funding it's recieving...Not exactly "reasonable" yet. :P

 

 

 

 

 

 

 

CERN created only several picograms of anti-matter and it cost $20 million to do so. That was in 2004.

CERN is real? For some reason it seems very fictitious in the book Angels and Demons. Granted I've only read the first few pages.

[bull912000]

If time travel were possible, we would know it. I think we could ask people from the past questions without making some kind of paradox.

[Nadril]

If time travel were possible, we would know it. I think we could ask people from the past questions without making some kind of paradox.

 

 

 

 

 

 

 

Again, travel to the past is highly unlikly, but travel to the future isn't.

[BlueLancer]

 

Last I read, it would take 100 billion years and 100 quadrillion dollars to make 1 gram of anti-matter with the current methods and funding it's recieving...Not exactly "reasonable" yet. :P

 

 

 

 

 

 

 

CERN created only several picograms of anti-matter and it cost $20 million to do so. That was in 2004.

CERN is real? For some reason it seems very fictitious in the book Angels and Demons. Granted I've only read the first few pages.

 

 

 

 

 

 

 

It's a huge organisation which employs thousands of people, with it's HQ in Geneve since 1954. It's real. Granted that they do have very extensive funding and not many people know all the stuff they spend it on, it can sound 'mysterious'.

[Tigra00]

I hate people that read Dan Brown. Everything that's fake, they take as real, and everything real, they take as fake. He sucks, and I hope he dies. :P

[jemathonical]

 

If time travel were possible, we would know it. I think we could ask people from the past questions without making some kind of paradox.

 

 

 

 

 

 

 

Again, travel to the past is highly unlikly, but travel to the future isn't.

 

 

 

 

 

 

 

I think time travel to the future is impossible too.

 

 

 

If everyone time travelled, we could skip 50 years of time and during those 50 years, the world could have changed and no one could do nothing about it because we weren't there. Like bushfires could have destroyed the whole of Africa

[LGBR]

I hate people that read Dan Brown. Everything that's fake, they take as real, and everything real, they take as fake. He sucks, and I hope he dies. :P

 

 

 

 

 

 

 

Hes like a cross between fiction and non fiction, its all fiction but its written like non-fiction

 

 

 

 

 

 

 

Going back in time isnt even thought about, it goes against the 2nd law of thermodynamics if I can recall correctly

[Death_By_Pod]

Faster than light travel is possible, the theories are there, and the equipment is planned. The only thing lacking is a suitable power source. Nuclear Fusion is too weak, and powerful Matter/Anti-Matter reactions are implausible due to the sheer cost of creating anti-matter ($1 Billion US per ounce!).

 

 

 

 

 

 

 

Until we can tame antimatter (1 pound of the stuff could power the entire world for 1 hour), we can't generate the electromagnetic fields that "warp" the time/space coefficient. NASA has all the theories regarding "warp speed", but technology has not caught up.

 

 

 

 

 

 

 

All the energy in the universe would not get you past the speed of light. You can approach the speed of light; however the closer to the speed of light you get, the greater the percentage of energy you put into accelerating yourself would be converted directly into mass.

[Nadril]

 

 

If time travel were possible, we would know it. I think we could ask people from the past questions without making some kind of paradox.

 

 

 

 

 

 

 

Again, travel to the past is highly unlikly, but travel to the future isn't.

 

 

 

 

 

 

 

I think time travel to the future is impossible too.

 

 

 

If everyone time travelled, we could skip 50 years of time and during those 50 years, the world could have changed and no one could do nothing about it because we weren't there. Like bushfires could have destroyed the whole of Africa

 

 

 

 

 

 

 

I think your overthinking this here.

 

 

 

 

 

 

 

Acording to the current theorys on how to be able to "time travel" having everyone time travel is highly unlikly, near impossible.

 

 

 

 

 

 

 

And just because if that could happen doesn't mean its impossible.

[sephiroth666]

its easy to go to the futre, freeze yourself. its been done, but up to so far, we havnt managed to thor people without them dieing...traveling BACK in time is impossible, because you need to go faster than the speed of light, which NOTHING can do.

[Nadril]

its easy to go to the futre, freeze yourself. its been done, but up to so far, we havnt managed to thor people without them dieing...traveling BACK in time is impossible, because you need to go faster than the speed of light, which NOTHING can do.

 

 

 

 

 

 

 

Going faster than the speed of light is for traveling foward through time, not backwards. Going back is impossible because it is impossible to go in a "reverse speed" because there are no negative mesurements in real life.

 

 

 

 

 

 

 

 

 

 

 

Freezing yourself isn't really a way of time travel IMO.

[sephiroth666]

actually its for both, although there is another way for forward, and there is that other way for backwards, but like you said it is impossible

[Barihawk]

 

Faster than light travel is possible, the theories are there, and the equipment is planned. The only thing lacking is a suitable power source. Nuclear Fusion is too weak, and powerful Matter/Anti-Matter reactions are implausible due to the sheer cost of creating anti-matter ($1 Billion US per ounce!).

 

 

 

 

 

 

 

Until we can tame antimatter (1 pound of the stuff could power the entire world for 1 hour), we can't generate the electromagnetic fields that "warp" the time/space coefficient. NASA has all the theories regarding "warp speed", but technology has not caught up.

 

 

 

 

 

 

 

All the energy in the universe would not get you past the speed of light. You can approach the speed of light; however the closer to the speed of light you get, the greater the percentage of energy you put into accelerating yourself would be converted directly into mass.

 

 

 

 

 

 

 

Correct, which is why the "Warp" project is still under planning (up to 250+ distinctive theories, all waiting for technology to catch up to them). With "warp" you essentially warp space and time around the spacecraft (some with bubbles, some claiming to go cross-dimensional...glad I won't be piloting that thing!). It's basic purpose is to remove all mass and add countermass (aka antigravity) to the spacecraft to allow it to break Relativity.

 

 

 

 

 

 

 

The only trouble with the theory is that we:

 

 

 

 

 

 

 

A: Do not have a fast enough sub-light engine. That engine has to be able to cross the lowest threshhold of the light barrier.

 

 

 

B: Do not have a suitable power source as of yet to power a warp-field generator. Antimatter is theoretically possible, but we have made little progress in the past 70 years in it's developement.

 

 

 

C: We don't yet have the facilities to effectively and cheaply test the hundreds of theories on FTL travel.

 

 

 

 

 

 

 

Maybe it will be 60 years from now like in Star Trek, maybe 500 years. Eventually, I believe FTL will happen. From there, time travel is child's play.

[sephiroth666]

nothing can travel AT the speed of light, never mind FASTER. Light travels at 300,000,000 mph(and is constant), but nothing else can travel that fast, mostly due to e=mc2, which shows that as things go faster, they put on more weight (due to the mass they have) and that slows them down, where as light is the only thing that can travel that fast without mass slowing it down, if we had no mass we could possibly go as fast, but unfortanatly, we cant loose our mass.

 

 

 

 

 

 

 

wow, i know more than i thought

 

 

 

 

 

 

 

also, even if it were possible, we'd die before we travel through time, from the high speed

[Nadril]

actually its for both, although there is another way for forward, and there is that other way for backwards, but like you said it is impossible

 

 

 

 

 

 

 

No, I said backwards was impossible because you would have to move at a negative speed which is impossible to do. It had nothing to do with actualy traveling at the speed of light. [which obviously, isn't possible with technolgy right now, but in theory it is].

[Barihawk]

nothing can travel AT the speed of light, never mind FASTER. Light travels at 300,000,000 mph(and is constant), but nothing else can travel that fast, mostly due to e=mc2, which shows that as things go faster, they put on more weight (due to the mass they have) and that slows them down, where as light is the only thing that can travel that fast without mass slowing it down, if we had no mass we could possibly go as fast, but unfortanatly, we cant loose our mass.

 

 

 

 

 

 

 

wow, i know more than i thought

 

 

 

 

 

 

 

also, even if it were possible, we'd die before we travel through time, from the high speed

 

 

 

 

 

 

 

If you read my post, you will see that the theory removes mass from the equation. The warp field would reduce the mass of everything inside of it. Including people.

 

 

 

 

 

 

 

We could survive FTL speeds. The early speeds would require G-Suits and thick padded chairs and harnesses. Uncomfortable, but good for research. Eventually, we could find a way to induce internal gravity in a spacecraft, which would provide intertial dampening (as in making it like the ship isn't even moving). The ship would look nothing like Star Trek or Star Wars (probably a large ring-shaped craft, spinning on it's axis).

[jemathonical]

If some one did time travel to the future, how would we know?

[Adam007]

 

 

 

Time travel is, and probably will be, possible in to the future. It already happens in small scale when astronauts reach stunning speeds, though they only go about 0.1 seconds in the future.

 

 

 

I beg to differ, unfortunately. Don't you think Hitler would have been killed and events like Pearl Harbor and 9-11 stopped, if time travel was discovered 1000 years from now? That alone leads me to believe that nobody will ever discover time travel on our planet. People like JFK just wouldn't be dead if someone could go back and fix it. Now, if alternate dimensions exist for every variable of time, there's still a chance that time traveling can be discovered. If not - I'm thinking it won't ever be. Unless you're John Titor, of course.

[LGBR]

 

 

 

 

Time travel is, and probably will be, possible in to the future. It already happens in small scale when astronauts reach stunning speeds, though they only go about 0.1 seconds in the future.

 

 

 

I beg to differ, unfortunately. Don't you think Hitler would have been killed and events like Pearl Harbor and 9-11 stopped, if time travel was discovered 1000 years from now? That alone leads me to believe that nobody will ever discover time travel on our planet. People like JFK just wouldn't be dead if someone could go back and fix it. Now, if alternate dimensions exist for every variable of time, there's still a chance that time traveling can be discovered. If not - I'm thinking it won't ever be. Unless you're John Titor, of course.

Traveling forward is much more plausible than traveling backwards in time, the reason you cant travel backwards is because you cant have a negative speed,BUT having a speed faster than the speed of light is possible, even though very hard

[Nadril]

If some one did time travel to the future, how would we know?

 

 

 

 

 

 

 

Well obviously someone isn't going to come from the past to us because, well, methods of time travel have not been done yet [only on an incredibly small scale]. We would probaly know when the method is developed.

[runesmithie]

 

 

 

 

 

Time travel is, and probably will be, possible in to the future. It already happens in small scale when astronauts reach stunning speeds, though they only go about 0.1 seconds in the future.

 

 

 

I beg to differ, unfortunately. Don't you think Hitler would have been killed and events like Pearl Harbor and 9-11 stopped, if time travel was discovered 1000 years from now? That alone leads me to believe that nobody will ever discover time travel on our planet. People like JFK just wouldn't be dead if someone could go back and fix it. Now, if alternate dimensions exist for every variable of time, there's still a chance that time traveling can be discovered. If not - I'm thinking it won't ever be. Unless you're John Titor, of course.

Traveling forward is much more plausible than traveling backwards in time, the reason you cant travel backwards is because you cant have a negative speed,BUT having a speed faster than the speed of light is possible, even though very hard

 

 

 

 

 

 

 

This has bothered me a LOT so I'll voice it here... STOP ESCAPING YOUR \,', and "s (It's messing up people quoting you ;\ )

 

 

 

 

 

 

 

For the love of all that is good, please stop :(

[sublimer1990]

 

 

 

 

Time travel is, and probably will be, possible in to the future. It already happens in small scale when astronauts reach stunning speeds, though they only go about 0.1 seconds in the future.

 

 

 

I beg to differ, unfortunately. Don't you think Hitler would have been killed and events like Pearl Harbor and 9-11 stopped, if time travel was discovered 1000 years from now? That alone leads me to believe that nobody will ever discover time travel on our planet. People like JFK just wouldn't be dead if someone could go back and fix it. Now, if alternate dimensions exist for every variable of time, there's still a chance that time traveling can be discovered. If not - I'm thinking it won't ever be. Unless you're John Titor, of course.

 

 

 

 

 

 

 

If someone did go back and change those events no one would ever know, except the person that changed them. To everyone else those things never would have happened.

[dark_ice]

Well I haven't done any hardcore research or anything but I'm just going to toss this out there for you all to flame, slaughter, have a party with, w/e...

 

 

 

 

 

 

 

Ok so let us assume that some guy builds the rocket ship that equals the speed of light. He takes off and goes into space in hopes of reaching these speeds and "stopping time". See, he is mad because his brother who is 3 years younger than him keeps callin him old, so he figures he will stay in space for 3 years, and return to earth being the same age as his brother.

 

 

 

 

 

 

 

BUT, even though he "stopped time", while he was in space his body was still functioning. It was still experiencing the same wear and tear of everyday as humans on earth in their normal time. So if he was 40 when he left and he stayed 3 years in space, when he returned wouldn't his body have put on the 'age', of a 43 year old? Its not like his body stops functioning while in "stopped time"?

 

 

 

 

 

 

 

Have fun

[Moridin]

Is Time Travel possible? There are some theoretical solutions but for the most part require physics that is still largely untested and still in the preliminary stages. Personally, I don't believe in it for one reason: there aren't any time travelers.

 

 

 

 

 

 

 

I would like to comment on a few things though that I learned in my physics courses at university (i'm doing BSc. in Physics).

 

 

 

 

 

 

 

a) Time Dilation

 

 

 

The russian astronaut experience this. As prescribed by relativity, when you travel at *any* speed, you will experience time dilation. What is it? Essentially, if you have a stationary observer (the inertial frame of reference) and an observer who is moving, the moving will *appear* to run slower. Why? Well it's related to Lorentz Transformations which are required when dealing with v ~ 0.5c.

 

 

 

 

 

 

 

While they are perfectly fine at any velocity, the difference (Lorentz Factor) is so minimal that it's only noticable with very senstivie equipment.

 

 

 

 

 

 

 

If you want to use this for time travel, it's only good for a one way trip. As for the Russian astronaut and his 20 milliseconds, he's not in the future in any way. He is merely 20ms older than a (hypothetical) identical twin who stayed on earth.

 

 

 

 

 

 

 

If you want to notice something, you'll have to go ~0.87c to achieve a factor of 2. (1 year in your moving ship = 2 years on stationary earth) If you want to calculate it, the forumla is:

 

 

 

 

 

 

 

gamma = c / (1 - [{v/c}^2])

 

 

 

 

 

 

 

b)Blackholes and Wormholes

 

 

 

These are two different beasts.

 

 

 

 

 

 

 

Blackholes have no escape. Don't enter them. You'll get "spaghettified" as you are stretched into a teeny string and crushed by the tidal forces. According to current theories, you will actually "escape" as the black hole evaporates due to quantum processess. But that takes billion of years and you get "spit out" an atom at a time. So don't hold your breath.

 

 

 

 

 

 

 

Wormholes are theoretical quirks that may never be realized due to energy problems. Many of the theories require "Exotic matter" which, well, is exotic so we dont know what it is. Also there are some that suggest the energy needed is more than the universe contains, so you are sort of buggered there.

 

 

 

 

 

 

 

The reason why wormholes work is because they connect far reaching areas of space together. Imagine a tall skyscraper with no stairs. The elevator connecting the floors would represent the speed of light. You can't get to a higher floor faster than the elevator travels. A wormhole would be a magic door that when you walk through, you reach the top floor from the ground immediately.

 

 

 

 

 

 

 

While it might appear that you travel faster than light, you arent. You are just moving across a shorter distance.

 

 

 

 

 

 

 

c)FTL and Warp Drive!

 

 

 

FTL - don't even think about it

 

 

 

Warp Drive - Theoretically yes.

 

 

 

 

 

 

 

A physicist named Miguel Alcubierre wrote a paper that discusses warp drive. It is very much how "Dune" works, 'travelling without moving.' He writes that by contracting and expanding space around you, you will "move" much faster that light. Technically, you are stationary, its just the space around you. Don't expect this anytime soon.

 

 

 

 

 

 

 

As for other FTL, its impossible. Einstein's theories do not allow it, this is the Theory of Casaulity. Information cannot travel faster than light. Also the Lorentz Transformations lead to some ugly things.

 

 

 

 

 

 

 

That Lorentz Factor I mentioned? Well, if you replace v with c, you end up with:

 

 

 

 

 

 

 

gamma = c / (1 - [{c/c}^2]) = c / (1 - 1) = c / 0 = eep!

 

 

 

 

 

 

 

Essentially, the curves for mass, time and length become asymptotic at c (i.e they reach infinity) Thus, there is no way to go faster than light. None. Period.

 

 

 

 

 

 

 

Photons travel at light speed because they are massless.

 

 

 

 

 

 

 

Poul Anderson wrote an interesting short novel "Tau Zero" that discusses what happens if a ship were to accelerate forever (never reaching c of course). Essentially, they would reach the end of the universe (assuming omega > 1 and it collapses).

 

 

 

 

 

 

 

d) Closed Timelike Curve

 

 

 

Say what?

 

 

 

 

 

 

 

Well, you, me, everybody has a "worldline." This is our path through the universe. For the most part its open, i.e. there is a start and end. However, there are a few ways to close it, thus allowing you to return to the past. These are extremely theoretical however as are the means of creating them.

 

 

 

 

 

 

 

The Tipler Cylinder is one of the popular ways of creating a CTC. It is a cylinder (duh!) made of neutronium that is, well, *very* long. Originally it was to be infinitely long, but Tipler said that several thousand kilometers is good enough, it would also have to be only 20 to 30km across. The only problem is that such a massive structure would collapse under its own weight.

 

 

 

 

 

 

 

How does it work? Well, a sufficiently rotating object will "drag" space-time around it - the Lense-Thirring effect. This is essentially proven, it's been detected around black holes and Gravity Probe B is currently testing this around earth.

 

 

 

 

 

 

 

Now, by draggin spacetime around it, the light cones will begin to tilt until they point *backwards.* If you took a ship and went to the correct place, you could in essence travel backwards in time. There would also be a place would you could go forewards.

 

 

 

 

 

 

 

I should comment that this frame dragging also applies to wormholes, and if one could accelerate one end of a wormhole you would turn the structure into a time machine, but you would be limited to going back to when the entrance first began to accelerate.

 

 

 

 

 

 

 

e) Paradoxes.

 

 

 

ZOMG! I KILLED GRANDPA!

 

 

 

 

 

 

 

Not going to happen.

 

 

 

 

 

 

 

Why? It's already happened. Lame answer, but a valid one. It would be rather difficult to do something in the past that would affect the future in a different way since the past has *already* happened. This is in essence the basis of Hawking's "Chronology Protection Conjecture." You can't do anything in the past that will screw up the present because it's already happened.

 

 

 

 

 

 

 

f) Multi Universe

 

 

 

The Many-Verse theories might make paradox resolution easier. Specifically, you aren't traveling to *your* past, but to another past. I don't care for this theory because the many-worlds explanation is largely due to the quantum processes and that "god plays dice."

 

 

 

 

 

 

 

There is also a "brick universe" idea which postulate we are like people in a flip book. Each page is a singlular instant. Time is just the perception of flipping the book, moving from page to page. Thus you can be comforted to know that you are immortal to a whole bunch of t=0 universes. I think it's a load of hooey though.

 

 

 

 

 

 

 

g) End of Me Talking! (hurray?)

 

 

 

 

 

 

 

So I'm going to sum up what I've said.

 

 

 

 

 

 

 

Time Travel to Past - Theoretically possible (so far), but I don't really believe in a real-world solution and that once we have a true theory of everything, such time travelling solutions will be gone.

 

 

 

 

 

 

 

Time Travel to Future - High v/c speeds will allow it, but there's no turning back, we don't have the technology to create or power such a high v engine. Antimatter reaction drive is best bet, UV light beaming onto anti-hydrogen crystal liberates anti-hydrogen that is collided with normal hydrogen resulting in mutual annihilation that releases high energy.

 

 

 

 

 

 

 

Faster Than Light - Theoreticaly impossible, foolish to consider this at all.

 

 

 

 

 

 

 

[/soap box]

[Just4u2nv]

Is Time Travel possible? There are some theoretical solutions but for the most part require physics that is still largely untested and still in the preliminary stages. Personally, I don't believe in it for one reason: there aren't any time travelers.

 

 

 

 

 

 

 

I would like to comment on a few things though that I learned in my physics courses at university (i'm doing BSc. in Physics).

 

 

 

 

 

 

 

a) Time Dilation

 

 

 

The russian astronaut experience this. As prescribed by relativity, when you travel at *any* speed, you will experience time dilation. What is it? Essentially, if you have a stationary observer (the inertial frame of reference) and an observer who is moving, the moving will *appear* to run slower. Why? Well it's related to Lorentz Transformations which are required when dealing with v ~ 0.5c.

 

 

 

 

 

 

 

While they are perfectly fine at any velocity, the difference (Lorentz Factor) is so minimal that it's only noticable with very senstivie equipment.

 

 

 

 

 

 

 

If you want to use this for time travel, it's only good for a one way trip. As for the Russian astronaut and his 20 milliseconds, he's not in the future in any way. He is merely 20ms older than a (hypothetical) identical twin who stayed on earth.

 

 

 

 

 

 

 

If you want to notice something, you'll have to go ~0.87c to achieve a factor of 2. (1 year in your moving ship = 2 years on stationary earth) If you want to calculate it, the forumla is:

 

 

 

 

 

 

 

gamma = c / (1 - [{v/c}^2])

 

 

 

 

 

 

 

b)Blackholes and Wormholes

 

 

 

These are two different beasts.

 

 

 

 

 

 

 

Blackholes have no escape. Don't enter them. You'll get "spaghettified" as you are stretched into a teeny string and crushed by the tidal forces. According to current theories, you will actually "escape" as the black hole evaporates due to quantum processess. But that takes billion of years and you get "spit out" an atom at a time. So don't hold your breath.

 

 

 

 

 

 

 

Wormholes are theoretical quirks that may never be realized due to energy problems. Many of the theories require "Exotic matter" which, well, is exotic so we dont know what it is. Also there are some that suggest the energy needed is more than the universe contains, so you are sort of buggered there.

 

 

 

 

 

 

 

The reason why wormholes work is because they connect far reaching areas of space together. Imagine a tall skyscraper with no stairs. The elevator connecting the floors would represent the speed of light. You can't get to a higher floor faster than the elevator travels. A wormhole would be a magic door that when you walk through, you reach the top floor from the ground immediately.

 

 

 

 

 

 

 

While it might appear that you travel faster than light, you arent. You are just moving across a shorter distance.

 

 

 

 

 

 

 

c)FTL and Warp Drive!

 

 

 

FTL - don't even think about it

 

 

 

Warp Drive - Theoretically yes.

 

 

 

 

 

 

 

A physicist named Miguel Alcubierre wrote a paper that discusses warp drive. It is very much how "Dune" works, 'travelling without moving.' He writes that by contracting and expanding space around you, you will "move" much faster that light. Technically, you are stationary, its just the space around you. Don't expect this anytime soon.

 

 

 

 

 

 

 

As for other FTL, its impossible. Einstein's theories do not allow it, this is the Theory of Casaulity. Information cannot travel faster than light. Also the Lorentz Transformations lead to some ugly things.

 

 

 

 

 

 

 

That Lorentz Factor I mentioned? Well, if you replace v with c, you end up with:

 

 

 

 

 

 

 

gamma = c / (1 - [{c/c}^2]) = c / (1 - 1) = c / 0 = eep!

 

 

 

 

 

 

 

Essentially, the curves for mass, time and length become asymptotic at c (i.e they reach infinity) Thus, there is no way to go faster than light. None. Period.

 

 

 

 

 

 

 

Photons travel at light speed because they are massless.

 

 

 

 

 

 

 

Poul Anderson wrote an interesting short novel "Tau Zero" that discusses what happens if a ship were to accelerate forever (never reaching c of course). Essentially, they would reach the end of the universe (assuming omega > 1 and it collapses).

 

 

 

 

 

 

 

d) Closed Timelike Curve

 

 

 

Say what?

 

 

 

 

 

 

 

Well, you, me, everybody has a "worldline." This is our path through the universe. For the most part its open, i.e. there is a start and end. However, there are a few ways to close it, thus allowing you to return to the past. These are extremely theoretical however as are the means of creating them.

 

 

 

 

 

 

 

The Tipler Cylinder is one of the popular ways of creating a CTC. It is a cylinder (duh!) made of neutronium that is, well, *very* long. Originally it was to be infinitely long, but Tipler said that several thousand kilometers is good enough, it would also have to be only 20 to 30km across. The only problem is that such a massive structure would collapse under its own weight.

 

 

 

 

 

 

 

How does it work? Well, a sufficiently rotating object will "drag" space-time around it - the Lense-Thirring effect. This is essentially proven, it's been detected around black holes and Gravity Probe B is currently testing this around earth.

 

 

 

 

 

 

 

Now, by draggin spacetime around it, the light cones will begin to tilt until they point *backwards.* If you took a ship and went to the correct place, you could in essence travel backwards in time. There would also be a place would you could go forewards.

 

 

 

 

 

 

 

I should comment that this frame dragging also applies to wormholes, and if one could accelerate one end of a wormhole you would turn the structure into a time machine, but you would be limited to going back to when the entrance first began to accelerate.

 

 

 

 

 

 

 

e) Paradoxes.

 

 

 

ZOMG! I KILLED GRANDPA!

 

 

 

 

 

 

 

Not going to happen.

 

 

 

 

 

 

 

Why? It's already happened. Lame answer, but a valid one. It would be rather difficult to do something in the past that would affect the future in a different way since the past has *already* happened. This is in essence the basis of Hawking's "Chronology Protection Conjecture." You can't do anything in the past that will screw up the present because it's already happened.

 

 

 

 

 

 

 

f) Multi Universe

 

 

 

The Many-Verse theories might make paradox resolution easier. Specifically, you aren't traveling to *your* past, but to another past. I don't care for this theory because the many-worlds explanation is largely due to the quantum processes and that "god plays dice."

 

 

 

 

 

 

 

There is also a "brick universe" idea which postulate we are like people in a flip book. Each page is a singlular instant. Time is just the perception of flipping the book, moving from page to page. Thus you can be comforted to know that you are immortal to a whole bunch of t=0 universes. I think it's a load of hooey though.

 

 

 

 

 

 

 

g) End of Me Talking! (hurray?)

 

 

 

 

 

 

 

So I'm going to sum up what I've said.

 

 

 

 

 

 

 

Time Travel to Past - Theoretically possible (so far), but I don't really believe in a real-world solution and that once we have a true theory of everything, such time travelling solutions will be gone.

 

 

 

 

 

 

 

Time Travel to Future - High v/c speeds will allow it, but there's no turning back, we don't have the technology to create or power such a high v engine. Antimatter reaction drive is best bet, UV light beaming onto anti-hydrogen crystal liberates anti-hydrogen that is collided with normal hydrogen resulting in mutual annihilation that releases high energy.

 

 

 

 

 

 

 

Faster Than Light - Theoreticaly impossible, foolish to consider this at all.

 

 

 

 

 

 

 

[/soap box]

 

 

 

 

 

 

 

 

 

 

 

I agree with you whole heartedly my african american brothern