Time travel is a scientific fact. It’s not an hypothesis or a theory, but a fact. It all springs from Einstein’s Theory of Special Relativity. The faster you go, the more you time-travel into the Earth’s future. This has been verified many times in the lab with small particles.
Ah, but here comes the sad part. You must travel close to the speed of light for the effect to be noticeable. That’s doable for small particles, but not for large objects like people. The energy required would be prohibitive.
So driving 88mph in a DeLorean won’t do it, eh?
We are all time travelers, traveling through time our entire lives at a very specific and fixed speed. All other ideas of time travel, including Einstein's, are fantasy. Or to use a more scientific word for fantasy, "theory".
That’s not time travel, that is time dilation.
The faster the vessel you are on gets to light speed, the less time (subjective) it is for you. However, time still goes on the same in the regular universe.
For example, imagine a spaceship traveling at 95% of the speed of light to a planet 9.5 light-years away. A stationary observer on Earth would measure the journey time as distance divided by speed, or 9.5/0.95 = 10 years. The spaceship crewmembers, on the other hand, experience time dilation and thus perceive the trip as taking only 3.12 years. (The math here is a little more complicated, but we’ll get to it later.) In other words, between leaving Earth and reaching their destination, the crewmembers age a little over three years, while 10 years have passed for people back on Earth.
If it’s on the net, or some video, it’s true. Haven’t we all learned that yet? The man should be ruler of the world.
Imagine you are as small as a photon. So small you can hitch a ride on it. You travel at the same rate as it.
If you traveled from one end of the universe to the other, no time would have elapsed for you. But the universe would have existed for 13.8 billion years. Is it therefore possible that light can traverse great distances in no local time? Instantaneously from our perspective? Just a question. Not an assertion. Not even a proposal.
I don’t actually look at it as ‘time travel.’ After all, we are all traveling forward in time, at the same rate.
What the ‘time travel’ hypothesis seems to be saying is that the person (object) ‘traveling’ is actually slowing down his rate of forward travel (in time). The rest of the universe goes on into the future, and when the ‘traveler’ comes to rest, he is in our common future without having experienced the intervening years.
‘Travelers’ stay relatively young, others age, and there is no ‘going back’ in time for the traveler.