Is time-travel possible?

I time travel forward all the time. It comes naturally to me. I just sit around and do nothing, and the next thing I know, it's later than it was before.

Even if our current understanding of physics is flawed enough to allow for time travel, it is very unlikey to allow for the transport of molecules without tearing them apart in the process.

Nothing unusual would happen to you as you haven't changed anything about you in your current dimension. In this theory paradoxes can not happen as you are constantly on a timeline different to your own without paradox.

I'm not sure if the many-worlds theory is what he's talking about, but according to many-worlds, you're not 'leaping' into another dimension, but rather it's an interpretation based in quantum mechanics, where there is no definite state of being. In quantum mechanics everything can be described as waves as well as particles. We don't really know where particles are, just that they're somewhere within this wave. By measuring something like an electron, we're collapsing that wave into a point that we can see. However, that point is just one of the many possible places where it could have been, so why is it that it appeared at that location instead of any other ones? Many-worlds theory attempts to answer this by saying that it in fact, does, but in another universe. Extrapolating from this and the fact that all particles are subject to the laws of quantum mechanics, we can say that every minute change in the universe will result in the universe branching off into another possible outcome.

You're not 'leaping' into another world, you're simply caught in the current of time, and whichever branch of reality you end up in is the one you're aware of, and there could be billions of you in billions of other universes all experiencing different things. Unfortunately you're stuck in this one, where you have to endure the nonsense that goes on in this forum.

Just my opinion, not scientifically proveable in the slightest.

If you follow string theory then yes, its undeniably possible, however as a scientist I'd be remiss if I concluded something exists without any evidence! :)

I've read similar theories, time travel is an extensive subject and something I'm interested in. I can't really speculate too much as I'm not someone with enough authority other than being self taught to make assumptions. However I can't shake the lack of evidence discrediting any time travel theories.

Yes time travel into the future is definitely, 100% possible, but yes so far traveling backwards has not been proven to be an option (unless we can somehow break the light-speed barrier, since anything that travels faster than the speed of light will go back in time, look up tachyons, a theoretical particle that does just that).

There are 2 ways to go forward in time:

1. increase your speed - if you hop on a super-fast spacecraft and circle the solar system and back again, the time on Earth will have moved faster relative to you. Maybe a month have passed on Earth when only 1 day has passed for you! (I did not do the math, so probably an exaggeration).

2. Find a source of immense gravity - gravity can distort spacetime. For example, the closer you go to a black hole, the faster the rest of the world will seem to look relative to you, and relative to the rest of the world, your movements will slow down to a crawl.

It's not likely we'll be able to take advantage of these 2 options any time soon though.

I don't believe in faith, I believe in choices.

Thank you! I enjoy the subject but I'm not very well up on it, it can be a very confusing subject!

It's quite a tricky subject really. If we're going by the many-worlds theory then time travel may not mean the future is set - the branching of possible outcomes might mean you could still end up in a future that is different.

I've also thought about what would happen if we built a machine that can take into account every single particle in the universe as well as calculate their interactions with each other. Would such a machine be able to calculate future events? On the one hand, there seems to be a very probabilistic nature to quantum mechanics - that is to say, when it comes down to small particles that make up the world, everything seems to be random with no set patterns, and with particles coming in and out of existence at will. This would seem that it may not be possible to calculate future events... however, what if these 'random' events are simply a result of us not understanding the rules? Maybe such a machine would be possible if we knew more about quantum mechanics? What would that imply for us though, knowing that everything is pre-determined?

Well, it's not a good thing, like back to the future showed, you would take the results of the games next year, bet on it, make huge ammounts of money, and that could be bad in some people's hand, I'd love to do it, but not every1 would be responsible lol.

Plus if you would go back with the tecnology we have today, you could cure millions of people, but people die for a reason, disasters are bad but the earth is overpopulated, we cannot save everyone, if we did, sooner or later would be a disaster.

But people would abuse that power and kill anyone that they would want. ;P

It would be bad if anyone could use it. Some people would use it to gain power, while others might just want to study history with it. The only time it wouldn't be bad, is if you were not able to interact with anything and the people couldn't see you (so kind of like being a ghost or something).

I finished episode 1 earlier. I'm struggling to remain interested, honestly. I'll wait for episode 2 before I draw any conclusions.

Kinda pointless then :P

Yeah, or maybe they have found a way to only send your conscience, but not your body, so you can't interact with anything and only witness stuff that happened.