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bassai26

Is what we call "TIME" really exist?

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If time doesnt exist then you couldnt travel through time. Just like in a video game that has save points or in a computer with system restore.

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I personally don't believe time exists as a law of the universe, but it's as real and critical to us as emotions are. I think of it as a concept we've put a name to to describe the way our brains interpret the collection and use of memories.

Besides, even if time travel is proven possible then moving just a few seconds into the past would probably land you in the vacuum of space given the movement of the Earth, solar system, galaxy and expanding Universe.

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Maybe time as a dimension doesn't exist, and that's why time travel may be impossible. On the other hand, maybe time as a dimension does exist, but all of time has already happened. Our experience of past, present and future is psychological in nature, an experience created by our consciousness.

In this scenario, time travel may also be impossible, as our consciousness is stuck in the "now" or present.

However, if all time has already happened, every moment in time still exists, as space and time are inseparable. We may somehow devise a mechanism to visit all of these still existing moments of space-time, past and future.

I'm just speculating to some extent here.

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If time doesnt exist then you couldnt travel through time. Just like in a video game that has save points or in a computer with system restore.

Well it does exist - or at least a set of laws and parameters exist that collectively we call "time".

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yep, the thing we call time relatively base on earths rotation and revolution around the sun. even though the earth stops rotating this doesnt cause the time to stop either.

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time is entirely relative, it speeds up according to speed of motion through space and slows down with gravity. If you travelled at half the speed of light for a year, out and back, hundreds of years would have passed on earth.

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Well to be clever....time is relevant....

It is basically a measure of motion in one sense. The sun rises, crosses the sky and sets then does it again...how we measure that activity is "time".

We call that a day...but a day here is not the same as a day somewhere else....

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Depends on how you define "time" as.

We use clocks to measure blocks of existence and we call it "time" but I am not sure we can actually travel back in the progression of existence, for example.

Pretty much what Jeremiah said.

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Posted (edited)

Time exists because if time didn't exist nothing would age, and as we all know everything ages

Edited by R4z3rsPar4d0x

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f78869e8-9827-4293-8d3f-ce96e4cd65b5_zps209bffe9.jpg
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Time can exist without change, but change cannot exist without time.

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time is entirely relative, it speeds up according to speed of motion through space and slows down with gravity. If you travelled at half the speed of light for a year, out and back, hundreds of years would have passed on earth.

Not verifiable in Relativity theory. Is it YOU travelling away from the Earth at C/2, or is it the EARTH travelling away from you at C/2? Both scenarios are true in Relativity just depends on the Observer.

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"People assume that time is a strict progression of cause to effect, but actually, from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... timey wimey... stuff."

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One of Einstein's well know quotes, regarding his friend Michele Besso who had died, goes like this: "Now Besso has departed from this strange world a little ahead of me. That means nothing. People like us, who believe in physics, know that the distinction between past, present and future is only a stubbornly persistent illusion".

I am not quite sure exactly what Einstein meant by this, but it is safe to say that his mind could understand much more complex concepts than most of us are able to.

Time depends on the observer. As others have said here, it depends on the speed you are moving at.

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Time most certainly exists. If it didn't there would be nothing we could call 'space' (and hence we would not exist either.)

Time is a property of our universe, and necessary for the existence of things. Time may not be a 'dimension' as we commonly consider 'direction' to be, but it is more likely that time-travel is impossible because of an information paradox* than for this reason.

*This paradox would apply when considering hypothetical time travel into the past, where the information from the future did not yet exist - if considering the universe as a causal system.

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Time can exist without change, but change cannot exist without time.

Would you care to elaborate? Because time can not exist without change, else "time" is non-sensical.

To my understanding anyway.

Now, if you were to say instead that "Local time can exist without change as long as the rest of the universe is changing", then that would be a different story.

For a rigorous discussion on time, one can visit www.physicsforums.com

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Well, time exists and does not exist at the same time. Everything is always moving yet stays all the time, everything is changing yet remains unchanged.

Look at the whole Allorganism.

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"Time" is a secondary phenomenon. It's merely a recognition of change. It's considered tied to space because signals propagate through space. If everything has an internal light clock. A piece of light traveling from point a to point b will take so many ticks of all the other clocks. Each piece is ticking at its own pace relative to all the others. There dosnt need to be a force of time as a thing it's merely a record of ticks relative to the others. In this sense time does exist like we say meter exists. It's merely an arbitrary measurement against something else. A meter could be a foot or a mile depending on what we agreed what It is. A meter in itself doesn't exist as an independent entity. It's all a secondary phenomenon of how energy interacts with space. Time travel would be completely impossible because there really is no past or future. The past is a previous state of the universe, and the future is a probable state of the universe. To move to the past it would require rearranging the entire universe. An immense energetic feat to say the least.

Now there is some evidence that precisely because there is no time that it may be possible for information about the future to exist in the present. This also means that the present can affect the past. Since cause and effect are not limited by some force of time it's free to work in both directions. Crazy I know. But there is a thought experiment machine that if built could probably send messages back in "time". Unfortunately it would have to be so large I don't think humans could ever build it. The signal would have to travel about 186,000 miles just to gain a single second or 700 million miles for an hour. Just to get a few hours of future knowledge it may take a contraption the size of a solar system with perfectly aligned mirrors set up in spirals using fractal geometry in a complete vacuum isolated from any kind of interference. With that kind of technological power it would seem like a waste of time just to be able to communicate with yourself a few hours from now. That's assuming that deep inside the system somewhere there is not another problem with its physics that cannot be overcome. But it's a cool machine anyway and could work wonders with the stock market, unfortunately you would have to spend more money and even resources that exist on the planet to make it. :)

Edited by White Crane Feather
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"Time" is a secondary phenomenon. It's merely a recognition of change.

Time then is a manmade construct in order for us to measure and go about our lives with regularity, to sort events into an order. But then as you say, it is really about change, about entropy.

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Time then is a manmade construct in order for us to measure and go about our lives with regularity, to sort events into an order. But then as you say, it is really about change, about entropy.

Yes change. Increasing disorder is change. The problem I have with most people talking about time and entropy is that they assume this universe is a closed system. If we really want to be strict in applying the laws of thermo dynamics, then it cannot be.

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I think the Universe is endless, whether it contains mutliverses or anything else we may have no comprehension of. If there is an end, a barrier, then it is not a universe, it is something else. We see a long way, but we see a tiny fraction of a tiny fraction of eternity. Even the expression "tiny fraction" is probably meaningless, time is meaningless except in our counting of years from our birth to our death. Big subject, difficult to explain.

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"Time" is a secondary phenomenon. It's merely a recognition of change. It's considered tied to space because signals propagate through space. If everything has an internal light clock. A piece of light traveling from point a to point b will take so many ticks of all the other clocks. Each piece is ticking at its own pace relative to all the others. There dosnt need to be a force of time as a thing it's merely a record of ticks relative to the others. In this sense time does exist like we say meter exists. It's merely an arbitrary measurement against something else. A meter could be a foot or a mile depending on what we agreed what It is. A meter in itself doesn't exist as an independent entity. It's all a secondary phenomenon of how energy interacts with space. Time travel would be completely impossible because there really is no past or future. The past is a previous state of the universe, and the future is a probable state of the universe. To move to the past it would require rearranging the entire universe. An immense energetic feat to say the least.

Now there is some evidence that precisely because there is no time that it may be possible for information about the future to exist in the present. This also means that the present can affect the past. Since cause and effect are not limited by some force of time it's free to work in both directions. Crazy I know. But there is a thought experiment machine that if built could probably send messages back in "time". Unfortunately it would have to be so large I don't think humans could ever build it. The signal would have to travel about 186,000 miles just to gain a single second or 700 million miles for an hour. Just to get a few hours of future knowledge it may take a contraption the size of a solar system with perfectly aligned mirrors set up in spirals using fractal geometry in a complete vacuum isolated from any kind of interference. With that kind of technological power it would seem like a waste of time just to be able to communicate with yourself a few hours from now. That's assuming that deep inside the system somewhere there is not another problem with its physics that cannot be overcome. But it's a cool machine anyway and could work wonders with the stock market, unfortunately you would have to spend more money and even resources that exist on the planet to make it. :)

Actually I was thinking about this thought experiment today. I grossly over estimated the size. It would only take 500,000 sets of mirrors 1,400 miles apart or 250,000 2,800 mikes apart to get a result. But I think it would be batter with some sort of crystal refraction rather than a mirror. A gravitational refraction would be perfect, but that would take is creating something like tiny black holes. ;) this is all just to just be able to send a message an hour back in time.

Edited by White Crane Feather

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