My opinion/theory is that time is linear and takes place at a constant rate. You can not stop time. You can not move back or forward in it. All you have is here and now, which moves along at an unchangeable pace. The only thing that we are able to change is our perception of time. For example, if you put your consciousness on “pause” and go to sleep for 8 hours, when you wake up you have effectively moved your perception of time ahead by those 8 hours. You have not “time-travelled”, however, because time exists outside of your perception. This is evidenced by the fact that many other events continued to take place at their normal pace even while you were asleep.
The biggest thing that gets people all excited about the idea of time travel is Einstein’s theory of relativity, which basically states that, well, everything’s relative.
For example, there’s no way to measure how fast the earth is moving through space because that depends entirely on your viewpoint. If you are standing on earth, it seems like it’s at a stand-still. But if you’re standing on an asteroid that is zipping along at 1,000 miles a second past the earth, then the earth looks like it’s moving really fast.
People have taken the concept of relativaty where it applies to movement and they have mistakenly tried to apply it to time. The reason why they do this is because humans identify and measure the process of time according to the movement of things (i.e. movement of hands on clock, movement of planets and stars, etc…). Technically, if all movement ceased to exist, there would be no way to measure time, so it would appear to have come to a stand-still. However, time would still be moving along at it’s normal rate, even though nobody would be able to measure it. You can’t change time by moving things any more than you can go back in time by moving the hands on your clock.
Here’s another thing that confuses people about time travel, making them think it’s possible: The speed of light.
Light travels at 186,282 miles per second, and the distance it travels in a year is called a “light year”, or 5,878,625,373,184 miles.
The most distant galaxies that our human instruments can detect are at least 10 billion light years away. Some people would say that the fact that we can see this light is evidence that the universe is at least 10 billion years old, because the light had to take that long to get here. Others say that God just flicked a switch and made the all the light from those distant stars just “instantly” travel the distance to earth when He created it.
There’s no way to know for sure, but we at least know this: Light generally takes a long time to travel over long distances.
We also know that humans see using light. Light bounces off of things and hits the back of your eyes, where the resulting signals are interpreted by your brain.
Now here’s the interesting bit. Look up into the sky. If you were to see a star that was exactly one “light year” in distance from the earth, you would effectively be seeing *into the past*. The light hitting your eyes has been travelling that distance for an entire year and is just now reaching you.
When scientists look at a star 10 light years away and they watch it explode, that is an explosion that actually took place 10 years ago! Crazy, huh?
Let’s say we figured out how to travel faster than light, and we flew 100 light years in distance from earth. Then, using an amazingly powerful telescope, if we were to focus in on earth, we would be seeing light that was 100 years old. If you zoomed in a little closer, you might even see people walking around in 1906 clothing, doing whatever people did in 1906.
Does this mean you “travelled back in time”? No! All you did was change your perception of it! It would basically be like rewinding a video-tape to see previous footage. Can you interact with the footage? Nope. It’s just light.
On that same note, you should be able to understand why you can’t “move forward” into time. You can’t change your perception to something that hasn’t taken place! The best you could do would be move close enough to the object in question so that you could see it in the now, instead of merely distant light from the past.
Hopefully now you understand what all the fuss was over time travel and einstein’s theory of relativity, and the speed of light. You should also be able to make sense of all the time travel nonsense that Hollywood puts out. Or at least I hope so…