do you think time travel is possible?

Question

I don't think it's possible. Here's my theory, picture timespace as a 3d grid much like this http://wwwvis.informatik.uni-stuttgart.d...
now lets say all the lines moving up and down and the one moving left and right are space, the one moving back and forward are time and the whole thing represents the universe. Now lets pick any interse ction and call it point a, that's where you are right now. With the earth rotating and orbiting the sun which is about a third away from the edge of a rotating galaxy, which itself is moving through space or the universe. You will never be at point a again in your life. even is you sat exactly still for exactly one year (use your imagination here) you would probably be in the same spot on earth and maybe the same spot relative to the sun, but the solar system would be in a different part of the galaxy and the galaxy would be in a different part of the universe.

Answer 1

What you've described in your assertion, is motion through time AND space. Time travel is just that...travel through time, travel through space need not be involved. So to make an assertion about time travel, you need to separate the space travel from the time travel. That is, time travel will be time travel regardless of where you are in space.

To answer your question...time travel as you imagine it is not possible. That is, I suspect, you are talking about traveling both forward and backward in time. There has been no evidence through experiment that anything can travel backward in time. In fact, travel through worm holes, for example, is just a wild imagination with no real basis in physics. Scifi stuff.

Even time travel into the future is improbable if not impossible. Relativity posits we could travel fast enough to slow our time down relative to the outside. Thus, when we returned from our trip, we'd find that we landed some time in the future from the time passed while traveling.

But, and this is a big BUT, the energy to accelerate to the velocities needed to make the travel into the future significant are beyond current and even predicted future capabilities. In the extreme, traveling at the speed of light, where time for the travelers stands still, would take an infinite amount of energy. Even the entire universe does not have an infinite amount of energy.

Answer 2

You are assuming that there exists an absolute rest reference frame for the universe. This is not the case. When you talk about returning to "this point is space", you need to specify "this point" relative to some inertial frame. If a point is at rest relative to the earth, it is not at rest relative to the sun or to the galaxy. (as you pointed out)

But this really has nothing to do with time travel. I don't know if time travel into the past is possible or not. Many great physicists are debating this very question. We will need to wait for a quantum theory of gravity to know for sure.

Answer 3

Time travel in the past is easy. It's what we call memory. To illustrate this, when we dream, we can live events in the past as if we were there. Time travel in the past is limited to what has been recorded in one way or another, but at the ultimate micro state of the universe all information is recorded! The other question is can we change the past? The reality is that, in accordance with physics, we cannot even change the now or the future. Free will is an illusion. So, it is the same in the past as it is in the now - there is no power to change what is fixed by the laws of nature.

Answer 4

We're all time travelers. You're traveling through time right now -- every minute you're a minute older. Some people travel through time faster than others. Einstein's special relativity shows us that time and space have a relationship such that as you travel faster through space you also travel slower through time. Gravity also dialates time. A clock on top of a mountain ticks a little faster than a clock at sea level. Pass the event horizon of a black hole and time stops.

As far as we know time is a one-way street. There's no going backwards in time.

Answer 5

Brian Greene's 'Fabric of the Cosmos" explores this idea thoroughly and concisely. Definitely check it out if you haven't already.

Basically, to the past, no. He states we would have to have a perfect record of every position of every particle in the known universe in it's exact position at the time you wish to be at. This means that on August 22, 1645 you would have to be able to simulate every particle that was existent then and it's position to rein-act that time in the slice of the space time loaf. This means your brain molecules; the Suns; every citizen of Earth, and outside of earth would have to be made in sync perfectly. That's a tall order to fulfill. And it's impossible seeing that no such records exists.

If we could one day record particles and their exact location all across the cosmos it would surely be tough to return to that time because your additional particles would disrupt it. That place in time was only existent with a supposedly finite amount of particles working a certain way at that moment. Us going back to it would ruin it. So, it's a bit or a paradox as you can see.

Fun Question though!

Answer 6

It's not a matter of what you think. Time travel to the past is absolutely impossible. However, you could easily "travel" to the future. Just go at around .5c for maybe 5 years, and when you come back to Earth, it'll be more like 50 years have passed.

Answer 7

If we could change and reverse time from one location of existence back to the previous one, then we could reverse our bad mean mistakes.
For example; if you find yourself in a location called Hell ,because of your misdeeds and blunders,and you were allowed to time travel in the past correct all your mistakes and misgivings it would be great.
That means you could travel back into the future to find yourself in Heaven.

Ah ! the beauty of time travel in the future or in the past, if it really could be done, the whole 8 billion people on earth would travel to and fro,without even getting lost?

Answer 8

particular in one path: the destiny. to accomplish that, you prefer an incredibly quickly spaceship that could commute to a significant fraction of the linked fee of sunshine. you will journey time contraction alongside here formulation t' = root (a million -v^2/c^2)*t the place t' is the time you journey t is the time experienced via a table certain observer (e.g earth) v is your velocity c the linked fee of sunshine. to illustrate in case you have been to commute at 10% of the linked fee of sunshine, you're able to journey a time contraction of ninety 9.498% no longer very ideas-blowing. yet at 50%, time contraction could be 86.60% at ninety%, it may be 40 3.fifty 8% at ninety 9%, it may be 14.10% at ninety 9.9%, it may be 4.40 seven% So in case you should get a spaceship to prevail in ninety 9.9% of the linked fee of sunshine, and shield this velocity for 4.40 seven years, on your return to earth one hundred years could have long handed via. Fly for 40 4.7 years, and are available lower back to earth one thousand years later. So in concept you could commute forward in time. almost there are some snags. With increasing velocity , purely like time contracts, your mass augments interior the comparable proportion (e.g. if time runs 10x slower, your mass is 10x bigger. so which you should journey the comparable stress on your seat, you're able to prefer to cut back your acceleration when you consider that your mass extra advantageous (bear in mind F=ma). additionally it may substitute into increasingly extra complicated to go at those speeds and probable your physique could go through extreme trauma (to illustrate each and each heartbeat could require so plenty extra capacity).

Answer 9

It's often said that you can't go back in time and change the past but you can change the future. It hasn't happened yet. I like to believe that.

Answer 10

whatever the endless story time travel is only possible if we can rip or re-shape space-time fabric and CONTROL it at light spped time is 0 so if we go faster than light sped we are able to go back in time.