If time travel was ever possible, then why hasn't someone from the future come back to visit us?

Time Travel in Einstein's Universe: The Physical Possibilities of Travel through Time

Will We Travel Back (Or Forward) in Time? by RICHARD GOTT III

Actually, I believe Einstein said time travel IS possible, but only in a very practical way. If someone can travel at the speed of light then they will pass time more slowly than someone on earth. Not very awe inspiring, except for the speed of light part, I guess. But, the thing we all want and mostly refer to when speaking of time travel he said was impossible, that being travelling BACK in time.

If it were possible the world would suddenly become over populated in the year 1933 as every time traveller tries to kill Hitler. Really though I think the past being unchangeable is much more poetic, and if it were possible then we would never learn from past mistakes if the consequences could be changed so easily. Where would it end? Want to save the dinsaurs? Want to stop Lincoln's assasination? Want to marry that childhood sweetheart who got away? Want to.....

If we somehow managed to travel back in time life would become a predictable meaningless existence.

Geez, you are still here.

Newton thought time is like an arrow. According to Newtonian physics, time goes forward, never deviates, and always goes in one direction. One second on earth is one second on Mars etc.

Einstein said, not so fast. Einstein concluded that time is like a river. It has forks and sometimes acts like a whirlpool.

Some time ago Stephen Hawking was famous for saying time travel is impossible. He asked, where are the tourists from the future?However as somone pointed out, technology for invisibility is only perhaps 10 or 20 years away and much more technically feasible for scientists to achieve in this century than time travel. Theoretically there could be time travellers all around us.

Ten years later, Stephen Hawking says he has searchd high and low for laws of nature and mathematics that prove time travel impossible. He hasn't found them, but, he says, that time travel would be impractical.

Some theoretical physicists are saying that to travel back in time would be to visit a different fork or tributary of time. Parallel universes? The new science says this is more likely than ever according to the latest theories of the nature of reality. There is more matter in this universe than previously thought, and the new science explains it in the way that there must be alternate universes of reality and expanding, like soap bubbles touching one another and growing larger. Apparently a mysterious force of nature holds it all together called dark energy. Or at least, that's what they believe is true of this universe. Known laws of nature may be similar, or even slightly or entirely different in parallel universes.

Parallel universes definitely opens up the possibility of travelling back in time, as it eliminates the question of why we haven't had any time travellers pop up. I've heard it said that for every possible outcome to a given situation, there is a corresponding universe. So in another universe Justin Beiber really doesn't deserve the attention he's getting, the U.S. is a fiercely loyal colony and Canada is made up of people who aren't really all that nice.

So maybe time travelling will ultimately be acheived by tuning into a different frequency, like changing the radio station. But if that is true then what is the real reality, and it still doesn't solve how we can change past events in THIS universe.

Perhaps we are living in a universe where Hitler and the Nazis were defeated by someone from the future travelling back in time to warn certain countries to prepare for a war of annihilation against Soviet communism. Perhaps Stalin didn't fully understand why he had a burning desire to increase steel production in Russia 500% by the mid 1930s. And perhaps both Hitler and Stalin were guided by foreknowledge from the future of an opportunity in time to either takeover the world or merely stop the other from doing so. Who knows? Hitler and the Nazis were said to have delved into the occult and even been in communication with beings from another dimension, or maybe just another planet not sure about that. Anyway it was revealed to me on the very credible TV show, UFO Hunters.

Yes, the Vril society. That was it. They were on about super people and the ultimate super weapon. Apparently the Nazis were the source of a German Roswell myth. Fascism wasn't the only thing imported to America from Europe after the war.

I don't know why our society isn't better than it is. We are the only species to threaten the existence of every other living thing on the planet. Excellent question.

But I remember am American comedy show, Saturday Night Live. I think it's still on. Back in the 1980s they did a low budget skit entitled, What if Superman had landed in Nazi Germany instead of Smallville, America? And I have pondered that question ever since.

I think there are special people all over the world working against the forces of chaos. Sometimes they lose, and sometimes they win. We're still here. In spite of a cold war and unprecedented nuclear threats, we are still here. However, I think the next 100 years is crucial to the future of human development as well as the overall sustainability of our way of life. We've made a lot of mistakes. It's time to start making a series of good choices for the sake of the present and future. We have arrived at a different kind of fork in the road ahead.

Because if I don't, then the world will blow up.

I sometimes turn the egg timer on on the stove while washing dishes. I give myself so many minutes to wash and dry in order to save the world. Games are fun. I was more or less an only child while growing up.

Scientists close to creating time travel
According to a message from the future

Txt urself from the future?  Will the first msg be lottery numbers, or "beware Daleks"?

I think that theoretically it's possible, but then you would only cease to exist in that universe. There would still be many more copies of you in other worlds. You might have to spend eternity hunting yourself down. But don't quote me.

Here's an interesting verse from "the book":

In my father's house are many mansions. If it were not so, I would have told you. - John. 14-2

Canadian Tom Harpur says the old testament and gospel languages were often poorly translated when transcribed from scrolls to text over the centuries. He thinks the original word for mansions here actually should have been "resting places". He thinks resting places means that the Christian heaven is not a bleak existence of endless harp playing and people lounging on clouds eating manna and whatnot, but rather an interesting and, according to other verses in the original languages of the day, a challenging adventure for all of us for the rest of time. So apparently we will have important jobs in the afterlife, or something.

Well, seeing as how I am existing only in the universe I am aware of, parralel universes don`t matter. The truisms of that book are human truisms not divine truisms.

I think this is my favourite thread. Of all time. 

Well, they certainly are truisms of a particular form of control. And when one thinks about it, it mightn't come as a huge surprise to realize that the moderate to most virulent forms of religious based 'trusims' finds a suitable ally of convenience alongside the more modern and currently predominant 'truism' of the free capitalist market. And so you have these ancient remnants that have become increasingly discarded elsewhere, hunkering down in fortress Amerika to evolve as new strains of militant extremism.  In order to continue perpetuating its remaining capacity for brutal control awhile longer, it has become a natural pairing for them to support the relatively newer globalized corporate order, which in the North American context at least has managed to mutate everything into a Frankenstien creation stimulated by artificially designed connections between liberty, freedom, capital, and god. It's reminiscent of the symbiotic relationship between the former ruler of the seven seas, Great Britain, and current master of the universe, the US.

But I'm probably not explaining my understanding of it very well actually, or perhaps the understanding itself could use a little more work.

The Kingdom is all around you. Rejoice.