The reality, however, is more muddled. Not all scientists believe that time travel is possible. Some even say that an attempt would be fatal to any human who chooses to undertake it
What is time? While most people think of time as a constant, physicist Albert Einstein showed that time is an illusion; it is relative — it can vary for different observers depending on your speed through space. To Einstein, time is the "fourth dimension." Space is described as a three-dimensional arena, which provides a traveler with coordinates — such as length, width and height —showing location. Time provides another coordinate — direction — although conventionally, it only moves forward. (Conversely, a new theory asserts that time is "real.")
Einstein's theory of special relativity says that time slows down or speeds up depending on how fast you move relative to something else. Approaching the speed of light, a person inside a spaceship would age much slower than his twin at home. Also, under Einstein's theory of general relativity, gravity can bend time.
Picture a four-dimensional fabric called space-time. When anything that has mass sits on that piece of fabric, it causes a dimple or a bending of space-time. The bending of space-time causes objects to move on a curved path and that curvature of space is what we know as gravity.
Both the general and special relativity theories have been proven with GPS satellite technology that has very accurate timepieces on board. The effects of gravity, as well as the satellites' increased speed above the Earth relative to observers on the ground, make the unadjusted clocks gain 38 microseconds a day. (Engineers make calibrations to account for the difference.)
In a sense, this effect, called time dilation, means astronauts are time travelers, as they return to Earth very, very slightly younger than their identical twins that remain on the planet. SOURCE: Space.com
HERE'S OUR PROBLEM: we are attempting to define and understand time travel using the physics that we currently understand and can prove mathematically... suppose there is a physics that we do not yet know which could easily explain time travel... Right now, we know that time moves forward because we move forward as we age... and, right now we easily understand that we cannot return to what happen a second ago and yet we know something happened because we were there and experienced it...
For example, I know that I typed HERE'S OUR PROBLEM (above) because I am aware that I did it and I can physically see it, but it happened in the past and I cannot REVISIT that moment as it is in the past. For me, time has moved forward... and, when you, the reader, read this, time will move forward for you as it read it. Yet, you know that in your immediate past that you did in fact read this.
Our mental abilities allow us to remember the past because we know that it happened while our physical bodies cannot yet return to the past that we are remembering...
NOT YET...
At some point-in-time, we will have this ability because of NEW PHYSICS that we will be discovering... and, may have already discovered but are keeping quiet so as not to upset the general public... if this is true, then it is the military who is keeping this a secret.
If we move fast enough then time slows down...
BUT, what if we can mover FASTER than just fast enough... or EVEN FASTER... it might be theoretically possible to stop time and then begin to reverse it... with that knowledge, one could travel back in time as time is still moving forward.
Would we be able to see time move forward as we move backwards?
OR, would we move backwards in a vacuum, seeing nothing, until we decide to stop?
We will one day have the knowledge... and, it is entirely possible that once we physically die we will have the knowledge as well... as we begin to live in a new way.
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