is time travel possible

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i really like time travel because i like science.

Well if you look at the way time operates in space then perhaps if you travelled far and fast enough it may be possible to then return to earth and find you haven't aged much while everyone else has? But beyond that, I doubt it. I can't see it being possible to travel backwards in time as your talking about reverting EVERYTHING to a previous state. As for travelling forward in time, that very base example is the best I can think of. We currently lack the technology to do this but from my understanding the theory is pretty solid? This is far from my field though but I do find this topic very interesting.

If time travel were possible and you traveled back to a time within your own lifetime, would the current you be there to witness the past you, or would you be the past you reliving that time again?

Time is change and change is time. If time stood still nothing would change. If nothing changed time would stand still.
Traveling at the speed of light makes time stand still for the traveler.
What has time got to do with light and change?
Is time and the speed of light consistent everywhere in the universe?
Is it consistent across time?
Things could get complicated.

I can confirm that it IS possible. I can't tell you how it works, though- that would change the history of 21st Century Earth so profoundly that, in 241 years time (from your perspective), I would not be born. I'm not being responsible, just selfish.

It would be great to find out which time paradoxes exist unless of course meeting yourself results in a chain reaction that would unravel the very fabric of the space-time continuum and destroy the entire universe , the destruction however might be limited merely to our own galaxy ( I'm not a BTTF fan )

And then there is wormholes.
http://www.andersoninstitute.com/wormholes.html

Time travel of any form could not occur if the entire past of our universe itself did not exist to be travelled to in the first place.
So does the past still exist out there somewhere, in some form.
If it does, then maybe it can be traveled to.

Time travel into the future would imply that the future as well as the past exists out there somewhere.
I once read something about time existing all at once but we experience it linearly.
I think time travel into the past and future would be possible only if time were happening all at once while we experience it linearly moment to moment.

We would also need to know where the past and future are located if we want to travel there.

We would bring our space maps into our little tardis time travel machines and consult our maps as to what wormhole to enter and what exit to get off when we reach our destination.

If time is happening all at once then we would be trapped for all eternity in that time period when we lived. It gets into the realms of religion here. It could be heaven or it could be hell.

If we did any time traveling, we would also be trapped for all eternity in the time period we traveled to within the time period we lived.
It gets complicated.

I think it is possible, but currently thought impossible with our current way of looking at things.

Regarding does the past exist in some form, I believe it does. Soundwaves for example do not cease to exist, they just get smaller and smaller over time. If you had a microphone type device that was so sensitive to sound and could amplify it, and could somehow block out other sounds, you could hear into the past.

You can also look into the past everyday, many hundreds of thousands of years even! Just look at the sky at night. Those stars you see are NOT how they look now, that light has took thousands of light years to get here and what we are seeing is the star those years ago.
It is possible the star does not even exist now, but we can see it still.

no.
it is not possible (in my opinion).

simple reasoning would produce the following certainty of the state of reality:

space is 3 dimensional and goes forever on all axes of being.

points (no length, height or width (therefore non existent in the real world, but none the less, what all space is composed of))

lines (dimension 1 (infinite length with no height or width. also therefore "pre real")

planes (dim 2 (infinite lines side by side which is infinite length and width, but still no height, therefore still pre real))

dimension 3 is "volumes" which are infinite planes on top of each other which gives rise to the reality of space.

the same is the case with time.
an "instant" with no length (duration) or height (getting more hard to describe but is simultaneous time)) etc etc. you can see how this is building inevitably. (hopefully)


so anyway, at every instant in all of time, space is fully occupied with inevitabilities, and there is no chance that you can displace those inevitabilities with your occupancy.

whatever i am not prepared to go into insanity mode so i will leave it there.

i always had the question that if both zero and infinity are indefinite, and they can not be used in any calculations, then why is it our number system starts at 0 and goes on forever (to "infinity")?

is there a measure between two indefinite points?

what happens if you multiply 0 by infinity? is the answer 0 or infinity?

with any quantity , if you divide it by 0, then you get infinity because there are an infinite amount of nothings that make up everything that exists.

but what if you divide infinity by 0?

what wins?
is the answer infinity or 0?
like 0 does not exist because that is what 0 means. not there.

but if all the universe if composed of that non existent value then f**k? the answer i think is that "infinity" multiplied by "zero" is zero, and infinity divided by zero is infinity.

they both win because both of them are equally non existent.

that's outside of mathematical expression so whatever.

Time travel is possible if you can fly around the planet fast enough to reverse its orbit.

Or if you can fly a spacecraft at 9 times the speed of light towards the sun and do a slingshot effect around it.

Although the most likely and practical means would be building a time machine. So perhaps the real question is, can a time machine be built?

But I wonder what the purpose would be.

Let's say there's a man who is 100 years old. In a way he has traveled 75 years into the future from when he was 25 back in 1942 to 2017 and.... what? Nothing. It doesn't really matter any.

I won't speculate on the connection to known physics, but I have occasionally seen my future in dreams, and I'm pretty sure the psychologists' explanations don't cover many such cases.

It's one of those things that relativity doesn't really address that well which shows that our understanding is incomplete. It does allow it in the same way that Newton's laws have nothing against things going faster then light, but in the same way that relativity revised Newton's theories relativity is almost guerenteed to eventually be revised by another new theory.

There are solutions to the relativity field equations that result in time loops and portals to the past, but they require some pretty crazy spacial geometry that would be impossible without crazy amounts of mass and sometimes negitive mass which may or may not actually be possible and it fails to address problems like temporal paradoxes.

Personally I am inclined to believe that there is an as of yet undiscovered law that prevents time travel, although the other possibility is that time travel is possible and there is an as if yet undiscovered theory that prevents paradoxes while still allowing time travel.