I don't know why, but this just came to me the other day:

Einstein's relativity tells us that time travel is possible, but you can only go *back* in time by traveling near the speed of light relative to the earth. Essentially if you were to travel really fast and really far in a space ship and then return to Earth, you would have traveled back in time.

So, if that is indeed possible, why has nobody in recorded history visited us from the future? My theory FWIW is that humanity must come to an end before we are able to travel at such high speeds.

It's sad, but it makes sense IMO.

There is the chance that nobody ever decided to travel as far back in time as we are now. *shrug*

How do you know nobody has visited us from the future? Do you think they would tell us why or if they came if the reason was to influence human history to their liking?

I don't know for sure; it just makes sense that it would be hard for someone to somehow arrive in a spacecraft and go completely unnoticed.

Think of time as in a video game. Inside the game, everything including time is relative. However, you can reload a save or go to any point in the game you wish.

There's no going forward according to Einstein, unless you could somehow make the entire planet earth travel near the speed of light and then come back. The problem with that is that everything on earth would be dead when it came back.

thats incorrect. According to Einstein's theory, If you travel really fast and far time would slow down for the spaceship and its contents. Time on earth would continue as it always does. So for the space ship (relative to the spaceship), earth's time woulds time appear to be running faster than its own. Imagine earth's time in fast forward. So once the space ship returns, Earth and all its contents would have aged more than the space ship and its contents. As an example lets say 100 yrs earth time passed but for the space ship they experienced only one year (these numbers were chosen for simplicity but there one could even calculate projected time deviations). So if you think about it, your not going back in time.

Some people conceive this as "time travel" into the future. they picture a person getting in a ship and driving hundreds or thousands of years into the future. In reality, its really not science fiction. Its the way the universe works. I could talk all day about my thoughts on such but i dont have the time. I hope i explained this well, its just the tip of a great big ole iceberg.

Ah yes you're right, my mistake. It is only possible to travel in time to the future. It is metaphysical. You have de-bunked my OP. Thank-you, Ocre.

wasnt trying to de bunk it. Sorry

LOL

No problem. I should have known better myself to begin with.