Time Travel Possible?

Do you guys think that time travel's possible? If so--why?

 

I don't think so. The Past and future aren't really places.

 

My idea is that we can travel back/forward in time by the speed of light.

 

Probably not. In theory we could but everything at this point is just theory and speculation. Nothing has a solid enough ground for us to base time travel on. we need more proof and evidence to recieve a solid idea. I say ask this question in 20-30 years and you'll at least have a slightly better answer then what we could give you.

 

As far as we know that' s impossible to do : e=mc2
The m stands for mass, the e for energy. Whatever your starship mass is, the amount of energy required to travel faster than light would be so tremendous that your ship wouldn' t be big enough to transport that much energy source. Increasing the size of your ship would increase the required amount of energy more than it would increase its storage capacity. Not to mention more energy source = more mass.

In short, we haven' t found yet any energy source that would allow us to do that, not even close. Besides, I think I remember reading somewhere that Einstein himself stated this was all entirely hypothetical, we' d have to actually get faster than light to be sure of the consequences of such a travel.

As for time travel in general Machina pretty much covered it up.

 

Nothing's impossible. By my calculations, it'll probably take millinea to build something that could travel as fast as light and could be able to go to a new dimension such as one of those train thingies for instance.

 

I said impossible for now, given the energy sources we know of now.
I' d be curious to see your calculations though ...

 

I was just trying to sound smart. I haven't actually made the calculations. [Just yet, anyway...] All I think we have to focus on is the present. To be able to build something advanced, we would have to make a drawing of it first. That's what I'm doing now--making a drawing of what might be a future time travel portal. [I'm not a scientist--but who cares?]

 

Oh and btw, a while ago there was a thread here about scientists possibly finding faster than light neutrinos. If memory serves it was posted by Machina. Here' s a quick follow-up : http://www.scientificamerican.com/a...n-light-neutrino-experiment-leaders-step-down

 

I remember on theory that said time travel will only exist when the first time travel possible device is created or something to that accord. He was saying that time travel only works like a point to point system from the time a time travel machine was created.
So for example, if a time travel machine was built in 2020, then that is the earliest time any one from 2020+ can visit to. That's a broad explanation but the main idea behind that theory of time travel. I have no idea why time travel would be subjugated to that law, but that's likely my lack of knowledge on subject.

I've never really cared for time travel. First, I wouldn't be able to use it, not like time travel would ever be given for public consumption, second I wouldn't want to, my time is here and now and this is where I should be not in the 1900s.
I don't think it's possible, mainly because it seems to go against a number of theorised and established laws of time as is, as well as a few other science laws.

 

The way I see it is if Time travel does become possible in the future why wouldn't people go back in time to change history by stopping Hitler from being burn and stuff to that effect? So it is for that reason I choose to believe Time travel is not possible or will ever be possible in my life time so it is of no concern to me.

 

Actually, based on what we know for sure now, anything traveling at the speed of light (let's just call that C for no particular reason) does not experience the time between when it reaches C and when it stops travelling at C. Based on that fact, we would have to go faster than C in order to travel backward in time. Even then, it wouldn't really work the way you'd think. For example, pretend I could shoot a bullet at a target such that the bullet would be travelling at a constant speed of 2C. Depending on how far away the target is, the bullet would experience the effects of hitting the target before ever leaving the barrel. In that sense, the bullet from after hitting the target traveled back in time to before it hit the target.

But there's a problem here. C is a universal constant for how fast anything can go. Nothing in the universe can ever go faster than C and no matter in the universe can even achieve C. The closest anything has ever gotten to C is the Oh My God Particle, which is recorded as having traveled at a speed of 0.9999999999999999999999951C through the upper atmosphere over Utah.

So if artificial time travel is possible, it's not going to happen by travelling faster than C.

Well, you have to consider that even in the distant future, there will be people who are stupid enough to try to change those things. As a result, time travel will most likely be limited to people who understand changing anything, no matter how big or small, will change everything. Those people are most likely going to be extremely rare, so it's unlikely that many people will get a chance to even attempt time travel, let alone attempt to change anything. And you also have to keep in mind that history is fixed. Any time-travel related mishaps would only serve to cause what was going to happen anyway.

 

Oh hi !

I believe that' s called the stable time-loop, as a storytelling device, but we actually have no way to tell what would or wouldn' t make sense if time travel was indeed possible. We' d have to try to see what happens.

Asserting which kind of logic would apply in those conditions, without any means to test such a hypothesis, would qualify as an argument from ignorance. More commonly known as an ass-pull. People asserting that "the big bang has to have a cause" or that "something cannot come from nothing" make the same mistake : they try to apply common sense where it doesn' t apply anymore. When it comes to what can or cannot happen before the big bang/in pure nothingness/in a time travel, truth is all bets are off.

Besides, we' re used to look at time from our human linear perspective, but I' ve read several different takes on it, ranging from "I don' t understand a word of it but it comes from a scientific journal" to "complete crackpot theory", such as this one : http://rationalwiki.org/wiki/Time_Cube

 

Well, that's space itself, not something moving through space. According to a documentary that I can't be bothered to look for, space can do whatever it wants. That's actually integral to the theory behind FTL travel in Star Trek if I remember correctly. They'd have a pocket of space in front of the ship that's constantly getting smaller faster than C and a pocket of space expanding faster than C behind the ship. The oversight was just imprecise language on my part.

 

There are many theories on the possibility of time travel. Some may be moderately believable, however many are not. As for the theory of using "Light speed" to travel through time, it's highly unlikely. Even if you were able to gain that kind of speed, I believe the most it could do is get you from point A to B faster. This could be a form of time travel, in the sense you are traveling at such great speeds.

However, if you're looking for something like the TARDIS to just flip a few switches and throw a few levers to travel about time at will, it's not going to happen. Time travel, even if possible, wouldn't be something that one could do with great ease. It would take a lot of energy, and a lot of luck to be able to pull it off.

In closing. Time travel might be possible, but in all likelihood, we'll never know in this lifetime.

 

I don't think time travel would be possible. Of course yes--we can look back into the past in space by how many light years you are from Earth but no--time travel wouldn't be possible--unless we travel through a worm hole in space, but we'd die because worm holes are like black holes--in a way...as to say a vast hole of nothingness.

 

I agree very much with this. We just don't know. Though there seems to be evidence of particles reacting nanoseconds. Plus, there's also an article on people looking back via space particles to see remnants of the big bang itself, stating that maybe we could look back to the first few organisms and such... I think it's the Hubble Ultra Deep Field or something that the article was referring to... Can't remember when they published it, but apparently if we can look back, they conclusively stated that there is a possibility for time travel as such.

As for me personally... I don't know if it exists, can't say so for sure just yet. Whilst I'd like to be wishful and say there is, nobody knows for sure.

 

I' m not sure how they went from A to B. When you see a lightning bolt in the distance the sound of that event is delayed, you hear it after you see it because photons are quicker than sound, but just because you can "hear it back" doesn' t change the fact that the lightning bolt is long gone. "Looking back" exploits the same principle, it' s just applied to photons instead of sound (for instance when you look at the sun what you actually see is the sun as it was 8 min ago).

I guess photons and sounds do travel forward in time, if you want to play with words, but I' m not impressed : I can do that shit too. ^^