Does Time Travel exist?

@ShadowArceus: I'm not sure if pimps were around in the 1920's. :D
Anyway, it's not a cell phone. There were no cellular lines or satellites, so no cellphones. You guys are going into a religious debate over Time Travel. Time Travel. Not something to get mad at people for.

But I just have to throw my two cents in. :D
By the amount of TV I've watched, here's my conclusion:
Time is like a single river, always flowing in one path. When someone Time Travels (Warps) backwards or forward and creates an alteration, they split the river off into a entirely different pathway where every single event in that time-stream is altered in someway. Just a theory!
 
Okay, first off, even if that was a cell phone, who in the world would they be talking to?
Second, I have this REALLY long theory I am working on that will prove time travel wrong (for now). It will take me like 15 minutes to finish, about 2 hours if my sister steals this labtop from me. Be prepared though time travel believers. My post is a complete summary of what Stephen Hawking himself said about time travel. Stephen Hawking, for those of you who don't know him, he is the genius in the wheel chair who can only communicate through that weird microphone.

^BTW, is your name Jacob too? Sorry, I was reading your signature (I know, what a noob; I read someone's signature) and I'm curious to know.
 
Time travel is technically possible, but for us won't be for a very long time, if ever. Time travel is a very funny and confusing concept. First of all, to travel through time you must be near the speed of light. Here's basically what time travel is. Time is relevant to speed, gravity, and some other factors. It's been scientifically proven. So with that being said, the faster you are going then the slower time goes (for you.) Meaning if you left earth at the speed of light, then came back, more time would have passed on earth than you would have while traveling. That's traveling to the future. In fact, if there was a clock on a fast accelerating object and a clock on a stationary object, the clock on the fast moving object would actually show that the time on it is earlier than the other clock. Now normally we won't see a difference. But when you go down into the billionths and beyond of seconds, you will see the slight difference. In fact I found this cool fact on a website.

"If such a train could attain 99.999 percent light speed, only 1 year would pass onboard for every 223 years back at the train station."

So is time travel possible? Yes. Can we do it right now? Yes, and we have. Is it possible for us humans to travel through time? As of now, no. Before we can travel into the future, we must find a way to transport us that gets as close to the speed of light as possible. Now we will never achieve the speed of light, but even coming close or even 3/4, 1/2, and so on will be enough for possible time travel. But the technology to send people like us with a much higher mass than the speed of light near the speed of light is looking far into the future. All of this is mainly based off of time dilation, spacial relativity, and so on. You can probably google it for a lot more information.

Concerning the video, I don't believe it would be true. You can't travel backwards in time, or at least what current theories state. Maybe in the future some mystery of the universe will allow us, but for now it's not. There are theories however with cosmic strings and wormholes, but that won't happen for a long time. But the possibility does exist, I guess.

But travel into the future is definitely possible, we have done it with protons and electrons and some other objects. There's also many many things to prove this theory. It's even been proven that time on mars is different compared to earth. It's been proven. Backwards time travel has not been proven. There's theories saying it can't happen and theories saying it can, but for now we honestly don't know until we try it. That will be far into the future though.
 
Now the speed of light is not actually impossible to reach, but the vast amounts of energy required render it nigh on improbable. We're talking nearly all the energy in the universe. Let's have a look at the equation that proves this:

e=mc2/squared.

Now e stands for energy, m for mass and c for the speed of light, the constant of the equation. What this equation says is that as the energy (for the sake of argument the speed) increases, as the speed of light cannot, the mass must, in order to make the equation balanced. Not really related, but there is a very interesting theory that states that c has not always been what is today, and that light actually travelled faster in the early stages of the universe. This apparently helps explain the mysterious inflation, but I read it when I was 12, a year ago and I can't remember too much.

But to prove Steadfast's point, we're never going to be able to travel at the speed of light, but it might be possible to travel near it, causing time travel possible.
 
Listen to me. I know I am only 14, but this is right down my alley. MOST of these words are from a documentary I saw on Discovery Channel from Stephen Hawking himself.

She is not talking on a cell phone. Time Travel is very possible, but not in the way you might think. There are only two ways to time travel. The first way is near impossible, but oh well. First, you need to locate a black hole. After one is located, you need a rocket with extremely powerful engines. I'm talking plasma engines here (basically, this method won't happen for a while). You then sail in close to the hole, but not into it. You want to be right where you are just feeling the gravitational pull of the black hole, but not getting stuck in. You then just orbit around the black hole, which slows down time. The theory behind this is that around extremely dense objects, time is slower because it is disorted by gravity. (Denser objects attract more gravity; I have a theory why, but I won't explain it here) This method is EXTREMELY difficult and dangerous, and the mathematical caculations are very complicated. The margin of error for this is so great, I don't ever see it happening. With time slowing down by you, everything else back on Earth is moving 'normal' speed. This means you are going slower (timewise) then people on Earth. When you break away from the black hole, you will be expierencing time at the same speed of people on Earth, but you will be days/months/years behind them. Depending on how long you were in the Black Hole's gravity and for how close will determine how far behind you are. Now you may be going, 'But if it seems like everything is the same time as before, wouldn't you be going backwards in time instead of forward?'. Number one, if you went backwards in time, you would be before you ever went to the Black Hole. Number two, while you may be what seems to be 'normal' time for you, the rest of the world may be years in advance, being the future. So what seems like 3034 to you, it may actually be 3039. Thus, you get time travel.

The other way to travel to the future, once again, is not the way you will think. What you need to do is get something to fly the speed of light (right now, I believe scientists have only gotton an object to 99.9997 percent speed of light). Basically, nature prevents anything but light to go the speed of light. But anyway, this object would go near the speed of light, and boom. You have time travel. If you were on this object that traveled at the speed of light for 1 year, when you got out of the object, it would be 100 YEARS LATER!

Now, you may be going, 'but how does this work' or, 'I could really care less'. If you are the second option, then just stop reading my post. For the first option, this is how it works.

When you go the speed of light, nature slows you down. Nature will keep slowing you down to keep you from ever reaching the speed of light, because as said before, only light was made for the speed of light. The faster you go, the more nature slows you down, which means the more time goes faster on the outside world. So let's say you are going 99.999% the speed of light and you decide to go faster. Now you are going 99.99999% the speed of light. Law of nature will slow you down even more, making time slower for you. (Even though time is going slower for you, you still think you are going 'normal' speed.)

(I mislead you guys. Law of nature says nothing may surpass speed of light, not: ONLY speed of light can go speed of light. Sorry)

Now you may be going, 'Let's say I am on this object and I get up and run forward. Wouldn't I surpass the speed of light? I mean, 99.99% of speed of light plus+ 5 MPH = Faster then Speed of light, right? WRONG! As said before, the closer you get to the speed of light, the more natural laws will slow you down.

As you can see, both of these technologies are very advanced and for the future. You may be thinking though, 'Those aren't time travel! You waste to much time trying to achieve time travel (i.e. staying in the near speed of light object for 1 year or rocketing through space for months to get to a black hole). But if you think about, even if there was a machine that 'magically' takes you to the future, it will still be wasting some time. Both of these theories may be hard to think of as time-travel because you are used to the stadard stereotypical get in a machine, bright lights, and boom! You are in the future.

Okay, so time travel to the future is a long way off, what about going back to the past?

One way to travel back into the past is Wormholes. Wormholes are hard to explain since we have no clue about them at all. All we know is that they are a disturbance in the space-time continuium.

Even if somebody somehow manages to find a wormhole and control, they could, theoretically, travel back to the past. The only problem is paradoxes. Here is an example that great Mr. Hawking came up with himself:

'Let's say somebody miraclously can successfully locate and control a wormhole, they could theoretically travel back to the past. So some mad scientist has his located wormhole and his machine hooked up to it. When he steps into the wormhole he brings a gun with him. How far did he travel back? Let's say only five minutes. So this mad scientist pops out at that exact spot five minutes earlier. He seems himself (mad scientist from the future; we'll call him #1. The other one, the one that hasn't gone into the past yet will be #2), and brings the gun out of his pocket and shoots #2. It is a kill shot. But then, if he is shot and dead BEFORE he enters the Wormhole, then that means that the shooter himself is not present in the past, for if he killed himself before he entered the machine, then he never really entered the machine. But, if he never entered the machine, then that means he never pulled out a gun and kills himself. THis means he can go back into the past and shoot himself. As you can see, the process goes on forever and never has an ending. This, by another law of nature prevents us from traveling back in time.'

So you may be wondering, then let's build a machine like in the book 'Timeline" (fantastic book, might I add). For a quick summary of how the machine works, this very rich person has mastered quantum mechanics and built a quantum supercomputer. In a rundown, a quantum supercomputer makes our supercomputers today look like caculators. A closer look, quantum supercomputers have an infinite amount of memory and can transfer information at speeds that are unimaginable.

THe people in 'TImeline' would step into a machine that would reconstruct the volunteer's body in a 3-D model. Basically, it was a 3-D quatum scanner that would scan every cell in the subject's body and rebuild it on a second quantum supercomputer. This info was sent through a wormhole to another dimension or universe, where the body was reconstructed on another quantum computer and the person was rebuilt. The method works kind of like a fax machine or an E-Mail. THe other dimension or universe would be sometime in the past.

So you may be going, 'Well, let's master quantum physics and mechanics and let's go see some dinosaurs!". Unfortuantly, it doesn't work that way. The law above that stated that nature prevents paradoxes by not allowing past time travel.

Conclusion: Therefore, that video is obviously fake. Another reason that is not science based on why it is fake is that: With all of the people ever to walk the Earth, don't you think that SOMEBODY would put their hand by their ear like that? I'm sure it has happened WAYYYYYYYYY more times then just then, but it was the first time it was ever recorded.

If you still believe that time travel is real, then PM Stephen Hawking and all the other Scientists in the world and tell your theory to them. I'm not trying to bash anyone or anything, so please don't bash me. This thread is only a friendly debate, and this post is just some words to possibly sway your opinion. So please, don't flame me. Also, most of these words are mine, but some are from Hawking himself and/or paraphrased. I only like Hawking so much, BTW, because he got me interested and got me seriously taking an odd look at Dark Matter/Black Matter.

Also, sorry if I have repeated anything that has been stated before. I have been working on this for a while and haven't had time to keep up with the current posts. Finally, I'm sorry if this is confusing. I tried to make it as short and sweet as possible (to no avail).
 
There is time travel, unfortunately it is only one way. Forward. As for the speculation about the cell phone, it couldn't work without cell towers.
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Who says she wasn't listening to a message or something? Or that it actually wasn't a cellphone, but some other put-up-to-your-ear-to-listen kind of device?

Or that her ear was sore, and that it was simply an ice pack? Or that her ear hut so she was covering it?
 
I'm wondering, if this person had this video, why reveal it so late? I mean, why not like 7 years ago when cell phones started becoming really popular. That also leads me to believe the person faked it for publicity. (300th post!!)
 
^ Well, it's possible that no one noticed until now. I mean come, it's extras from a movie that premiered in 1928, not many people have watched it. . Also @your huge post: Wouldn't the scientist cease to exist if he went back and killed himself? Also the one thing about science is that nothing is impossible, we just haven't found the answer yet. It's like how scientists said the world was flat, and they were proven wrong, so maybe in a day, a year, 500 years from now, someone could prove that theory wrong.

Also, it's properly not a cell phone. But.... what if it's some type of device that allows the person to talk to someone in the future? You never know. But I personally think this doesn't prove that time travel exist, but we still don't know what or if anything is in her/his hand. (I still think it's a dude xD)
 
I believe you can travel both backwards and forwards through time. I saw this show on National Geographic or Discovery or History, and this guy went in a black hole up in space and he went at the speed of light; he distorted time. If I see this show again, I will explain in detail. I also remember watching a UFO show (I'm such a freak) and these people built a UFO and they were in it and this other group of people said, "Woah, we saw you come all the way out here with your aircraft!". And the people in the UFO were like "We never left..." but they saw they were grassy and their clothes were wrinkled. Theur UFO went so fast, they can't remember it. Same goes for the black hole story to. If we did time travel, we wouldn't remember we did, so we would get awfuly confused if we did.
 
Honestly, I know Time Travel sounds awesome, but I don't see it happening. I know that all scientists say that, "Oh, look at these models," but how do you get to these models in the first place? What have you been observing that tells you it's possible? It just confuses me how this could actually be possible. Because honestly, it doesn't seem practical.
 
Steadfast said what I was going to say. My dad has explained that all to me before basically the same way, even with that clock example. As for the phone, like others have said, who would she be talking to? No cell towers, etc. Its a cool video, but not time traveling lol. I think the pimp-slap theory is most probable xP
 
There is a very high chance that time travel will NEVER become reality.Sorry but I must disagree.
 
We have got some Physics majors up in here. :/
So what is the final judgement? Yes or no?
 
@JacobtheElf - I'm going to PM Stephen Hawking now...

LOL!

To sum it up, time travel probably isn't possible. Probably. But contradicting myself, if the postulated Higgs' Bozon is proved to be true, and can somehow be removed, then we could remove increasing mass entirely from the equation. Just a theory.
 
As a 3rd year Astrophysics student, seeing threads like this makes me pretty happy as it indicates that there's an interest in my field among the younger generations. Some of the opinions here though are a little misguided, so I'll refer you all to Steadfast's and JacobeTheElf's posts as they are more or less accurate and have some pretty good analogies.

If anybody is curious about the mathematics behind the weirdness of time dilation and its derivation, I'd be happy to write up an explanation as I express an interest in teaching.
 
@Scuba Stevee. I wasn't the one who mentioned it after all.

@Shadow Arceus. Now if we assume you would be able to travel back and, in this case, kill your grandmother. You would not be killed on the way to her, that would look like there is some intelligence playing with you. Instead you would be able to kill her, you won't disappear, but the 'you' that was going to be born in the future will just never be born. You would just live your life in the past without any consequences. It would just create another alternate timeline every time someone would travel back in time.

As I would love to reply to some more posts, I unfortunately don't have any time left, will be continuening tomorrow.
 
This is what I think of Time Travel:
  • You can only travel to the past and future (duh)
  • Whatever happens, happens. you can't change the past no matter what you do.

I'd like to bring the Butterfly Effect to the discussion:
Code: 
The phrase refers to the idea that a butterfly's wings might create tiny changes in the atmosphere that may ultimately alter the path of a tornado or delay, accelerate or even prevent the occurrence of a tornado in a certain location. The flapping wing represents a small change in the initial condition of the system, which causes a chain of events leading to large-scale alterations of events (compare: domino effect). Had the butterfly not flapped its wings, the trajectory of the system might have been vastly different. While the butterfly does not "cause" the tornado in the sense of providing the energy for the tornado, it does "cause" it in the sense that the flap of its wings is an essential part of the initial conditions resulting in a tornado, and without that flap that particular tornado would not have existed.

Let's apply that theory to something more big, like Hitler. If I was to travel back in time and kill Young Hitler, WWII would never happen. The Holocaust would have never existed. All of these changes will set off more changes, like Dominoes. All of these changes will lead up to today, where it will not be the same. You will most likely, 99.9% chance of never being born. All because of one event, time will alter. Seeing as you would never be born, how did you kill Hitler? It all ends in a never ending "What if...".

I think the bigger question is, Has time travel to the past already occurred? Seeing as we are standing here, reading, I say no. So traveling to the past is bogus and useless.

Traveling to the future is the only thing I can see :/
 
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