Is Time Travel Possible?

You might find Wikipedia's article on time travel to be interesting:

http://en.wikipedia.org/wiki/Time_travel

Time travel into the future is possible in principle by exploiting
relativistic time dilation (the so-called Twin Paradox).
Unfortunately, there is no known way to travel backward in time, so
you can't get back to the present. Major problems with causality would
ensue if you could travel backward in time. These are the fodder of
size fiction. Physics has no way to accomodate going back in time and
stopping John Wilkes Booth from assassinating Lincoln. There is lots
of speculation about time travel in the vicinity of highly curved
spacetime: black holes, white holes, worm holes, etc. Suffice to say
that the classical equations of relativity seem to allow you to
postulate a universe in which you could travel back in time, but it
may be impossible to realize these solutions when we have a full
quantum theory of general relativity. Even if such solutions are
allowed, it is also not clear that they could ever occur in our
universe. Now I will go check out the Wikipedia article that Pink
pointed us to.

I said "size fiction" when I meant "science fiction".

Captain Kirk, you have traveled in time no fewer than 14 times (TV
series, cartoon series and books). It is amazing you don't trip over
yourself on a daily basis.

No time travel not possible in any practial way. 

 Unless you are very very small atomic size and have access to very
very cheap energy.

And well its just not enough bang for the buck.

Not worth writing home about.  (Cause the family will have died By the
time you get back :)D

According to the Bible account, In particular circumstances, time
travel IS possible. The first account is when Satan offered ALL THE
KINGDOMS OF THE WORLD, for one act of worship by Jesus to him [
Satan]. It did not limit the Kingdoms to just Jesus' time. It included
ALL Kingdoms, right up to the present day. Of course Jesus refused.
Matthew 4; 8-11 "8 Again the Devil took him along to an unusually high
mountain, and showed him all the kingdoms of the world and their
glory, 9 and he said to him: ?All these things I will give you if you
fall down and do an act of worship to me.? 10 Then Jesus said to him:
?Go away, Satan! For it is written, ?It is Jehovah your God you must
worship, and it is to him alone you must render sacred service.?? 11
Then the Devil left him, and, look! angels came and began to minister
to him". Luke 4; 5-8 says the same "5 So he brought him up and showed
him all the kingdoms of the inhabited earth in an instant of time; 6
and the Devil said to him: ?I will give you all this authority and the
glory of them, because it has been delivered to me, and to whomever I
wish I give it. 7 You, therefore, if you do an act of worship before
me, it will all be yours.? 8 In reply Jesus said to him: ?It is
written, ?It is Jehovah your God you must worship, and it is to him
alone you must render sacred service.??
Also when the apostle John was granted to write Revelation, he was
given a vision of the future and was seemingly transported to heaven,
temporarily, where he saw things that he wrote about and even spoke to
angels who were present. Revelation 17;17 And one of the seven angels
that had the seven bowls came and spoke with me, saying: ?Come, I will
show you the judgment upon the great harlot who sits on many waters".
Arguments will arise as to whether John was just seeing these visions
in his mind, but if so, why should the angel not just show the visions
instead of saying " Come, and I will show you" . This indicates that
John was actually there. The word ' come' indicates a presence there.

I'm sure captainkirk1 wanted some evidence outside science fiction.

Time travel is perfectly feasible
- I travelled two hours into the future since reading this.

Nothing is impossible, but some things are unlikely

The prosaic answer is yes. We are all travelling forward in time at a
speed of one second per second.

If you want to do what is commonly called time travel in science
fiction then I'd say practically impossible. In these tales it is
usual to see the universe as a stage and people players on it. But we
are just part of the universe. So time travel is like a section of
road digging itself up and appearing further ahead or behind within
the road there.

You might try and change your question to 
Is time "Viewing" possible, there's much more evidence pertaining to
the possibility of that happening much sooner than actual physical
travel.  Even with that though I believe it you can only see forward.

Treavelling backwards or forwards in time are intriguing thoughts, but
it should be considered that if it were possible to travel forward in
time  - get a glimpse of something that is going to happen one day - 
this presupposes that everything is pre-ordained in detail, that free
choice is just a myth.  That puts the ball back in Pugwash's court. 
;)

Traveling forward in time at a faster rate is an established fact.
Yes, your body travels with you, no it does not require
predestination. For any humans who have done this (for example in the
experiments in which they flew around the world with atomic clocks)
the time difference was measured in minute fractions of a second. From
experiments, we know that subatomic particles can survive for 1000's
of times longer than their half lives by accelerating them very close
to the speed of light.

For all practical purposes human time travel is impossible until we
can build space ships that can travel at close to the speed of light.
Even then, it wouldn't be any fun, unless you like the idea of being
Rip Van Winkle, since there is no way to get back to our starting
point.

Well, there are two ways to look at this -- first is that anything is
possible and we just haven't discovered how to do it yet.  So
conceivably, yes, time travel is possible; we just haven't discovered
or invented the means to make it a reality.

But there are just too many paradoxes.  What happens if the time
traveller goes back and kills his mother before she gives birth?  Then
the time traveller is never born, so he can't go back in time to kill
his mother, so he's alive, meaning he did go back in time, so he did
kill his mother, but that would make him dead, so...now I'm confused

Or what if the time traveler travels back in time and gives time
machine technology to an earlier civilization?  Then, they have time
travel equipment, meaning that future time travel equipment will no
doubt be more advanced, so the original time traveler will now
automatically have a better machine, but that would mean he could do
this infinite times, ultimately changing everything...

My head hurts thinking about all this...

Due to the paradoxes, it seems that time travel is just not really feasible.

Yes

My mate Kevin travelled forward in time, to 13 February 2019.
Obviously, we can't prove it until then, but he stopped off in 30 July
2016 and bought a newspaper. He took the newspaper ("The Guardian")
with him to the Blarney pub, in Kreuzberg, Berlin (in 2019). So if you
want proof  he travelled forward in time, be in the Blarney. (When he
came home he told me the headline on the back page: "Fifty years on
from England's glorious victory"). If that's not proof, what is?

Time travel is certainly possible... I am travelling forwards through
time at a rate of one second per second, as I type.

It is possible to slow down the passage of time - eg so that for every
2 hours that passes in the rest of the universe, only 1 second passes
from your point of view. This effect occurs when travelling at high
speeds (ie close to the speed of light) and has been confirmed
experimentally. http://en.wikipedia.org/wiki/Time_dilation

So... we have a genuine method of travelling to the future. But,
unfortunately, you may be stuck there. Current theories (Einsteins
Reletivity is the important one) do not forbid time travel... but it
is very hard to do. You can do it in a rapidly rotating universe...
but ours does not spin enough. It can also be achieved with the help
of cosmic strings, or a wormhole threaded with exotic matter (matter
that is repulsed from itself under gravity,) or extra dimensions. But
these are theoretical beasts - there is no evidence that they exist,
or are possible, in our universe.

Steven Hawking has proposed the Chronology Protection Conjecture
http://en.wikipedia.org/wiki/Chronology_protection_conjecture
Basically he says that while we do not know of any laws that prevent
time travel, the fact that we haven't met in 'time tourists' would
seem to suggest that it is impossible, and that some unknown law, or
an unseen implication of current laws, prevents time travel.

Time travel is theoretically possible by going through a wormhole that
you either somehow, by a process unknown to us earthlings, created one
or pumped up one from quantum fluctuations. Then you create a time
difference between the two mouths of the wormhole by taking one on a
trip at near light speed for time dilation to take effect. Or else you
can TRY to go thru an Einstein-Rosen bridge but upon arriving at the
singularity, got wiped out by the intense radiation. But there is a
theory that the earliest time that you can travel to is the time the
time machine is created. I'm not gonna go into the details. gtg bi

I once discovered a worm hole and made my way in... success! Then I
killed lots of TIME the rest of the day fishing.