Isn't it true 'time travel' will never be possile. Someone would have travelled back and told us about it.

Answer 1

maybe they have, you should call up a random mental institution and ask if anybody claims to be a "time traveler"
I guarantee if anyone starts talking crazy like that, that's the first place they'd go.

Answer 2

Yes and no.

You can travel into the future (even now in very small quantities, see example), but you will never be able to travel into the past.

Think of it like this:
As one gets travels closer to the speed of light, their perception of time changes.

Experiments have been done to prove it.
Two atomic clocks were started in complete sync each other. One was placed onto an airplane, and the other remained on the ground. The airplane was then flown around the world. Upon return to the ground, the clocks were stopped. The one that was on the ground had more time pass than the one on the airplane.

Granted the amount of time was very minute, hundreds of thousandths of a second, but the clock on the plane did seemingly travel into the future.

Answer 3

Time travel could be possible. The people from the future may have decided not to tell us. Another possibility is that the people from the future are trying to prevent us from knowing about the science of time travel instead of informing us.

Or it could have been that Person A from the future has tried to tell us but due to some complication caused in Person A's future, Person A's future person or someone else (person B) has had to come back to our time from the second future to stop A from talking to us, hence restoring a change in a future time scale that we have no knowledge of since it hasn't happened yet. But then someone from person A's present time or Person C could go into Person A or Person C's future or Person B's present, to stop person B from going back in time to stop person A from talking to us. This can go on forever and is maybe why we haven't heard about it yet, there is an infinite loop of people trying to stop each other first.

Answer 4

if you ask this question again when time is better understood you will get a more accurate answer. but if one respected theory is correct ( both newton and einstein say this is impossable) a massive release of energy from a unknown source created a chain of events called, Cosmic time line this chain of events created matter and time, in order they are:-
1. big bang
2 2 periods of expansion
3 Quirk soup
4 Big freeze out
5 parting company
6 first galaxies
7 modern universe.
from the big bang to a period 10^-43 seconds later a violent period of expansion occured, this continued in a second period of inflation from 10^-43 to 10^-33 seconds later but less violently expansion, within these two periods space expanded by a factor of 100,000000,000000,000000,000000,000000,000000,000000,000000 some expansion. The combination of energy and expansion created basic structures of mass Known as lepton and quirks. As expansion slowed because sufficent energy was not available to support it. This created some space to cool. that in turn caused the lepton and quirks to group into more complicated structures, these structures eventually became galaxies that turned into our modern universe.
so if this theory is followed (although unproven), it would indicate that today structure of matter is yesterdays structure of matter the has been altered by various changes that have occured over the course of time. So the short answer to your question is if you could recreate these various changes in reverse you could recreate the past but only in the future, because the only energy you have to make any change is what you currently have. But there is a lot of that little word "if".

Answer 5

Ah, but don't forget the Morphail effect!

We live in a universe where time travel has not been invented. As soon as a time-traveller arrives, a new universe, in which time travel exists, is created and splits off from our own.

Or something.

Answer 6

Maybe if time travel is possible people in the future might have found a new material that is vital to the production of the machine and it hasn't devolped yet. So they couldn't make any now if they came from the future.

Answer 7

Maybe they just didn't tell you.

Time travel is possible. Just with not todays tech. Traveling very close to the edge of black hole will seriously move time forward... if you moved very close to the event horizon and pulled away... 100s - 1000s of years could have passed... it all depends on how close you get and for how long...

good luck..

Answer 8

the most beleiveable time machine theory is based on generating a worm hole and stretching it through space and back again at a close to light speed velocity. unfortunately this would mean that whilst you could travel back and forth in time you could only go as far back in time as the mouth of the wormhole existed so you could only back as far in time as when you first build the time machine. but who knows maybe there is a better idea out there.

Answer 9

I would think that physical time travel would be practically impossible, but communicating through time would be possible, think of it as someone has a transmitter, we just have to smart enough to invent the receiver.

Answer 10

Albert Einstien discovered a way, but could never prove it.

He said that if you travelled around the world at the speed of light, you would move that fast that you would be standing infront of your past self. (Only a lightspeed second behind)

Who knows. I'll try if we could travel at speed of light!