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As the universe expands and the overall density of 'stuff' decreases, eventually you get to the point (after a REALLY long time) where there isn't even a single particle of any kind in a volume of space enormously larger than our entire universe now, and then the universe keeps expanding and expanding and expanding.
Eventually, the 'arrow of time' becomes erratic (and 'fails') as there isn't 'anything' left in the universe for time to impinge upon.
It's pretty depressing, really. In the long run, the universe erases itself. Nothing matters, nothing at all is eternal, the fate of and for everything is infinite dilution in an infinite void . . .
(August 31, 2014 at 9:30 pm)KUSA Wrote: The arrow of time only goes forward. The entropy of the universe can't be undone.
Would this also mean that if we could travel to the future, we wouldn't be able to return?
Hypothetically, if you could travel in to the future by skipping time (we are always travelling into the future, but can do so at different rates) then I suppose you should be able to travel back in time to where you started, but no further. If you can travel back to before your time, then you can make paradoxes (like the grandfather paradox), which is an impossible situation, so getting to a point where you can do something impossible should be impossible.
If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. - J.R.R Tolkien
(August 31, 2014 at 6:18 pm)lifesagift Wrote: ..think about it... technology is bounding forward, splitting atoms etc..so let's guess that in the next 100 years we'll suss out anti gravity, and maybe invisibility in 300 years.. and maybe time travel in a thousand years time...? But if they discover time travel, they can then go into the future and discover more technical ways or improving it... so it will be easy to travel back in time... and then mass produce it for everyone almost as a recreation... so take that 10,000 years hence, with population increases.. surely most people that live in the future will be visiting ancestors in the past ?
So where are they?
The past and the future are mental constructs built from memory and prediction. They are not physical places that exist.
You cannot travel somewhere that does not exist.
MM
"The greatest deception men suffer is from their own opinions" - Leonardo da Vinci
"I think I use the term “radical” rather loosely, just for emphasis. If you describe yourself as “atheist,” some people will say, “Don’t you mean ‘agnostic’?” I have to reply that I really do mean atheist, I really do not believe that there is a god; in fact, I am convinced that there is not a god (a subtle difference). I see not a shred of evidence to suggest that there is one ... etc., etc. It’s easier to say that I am a radical atheist, just to signal that I really mean it, have thought about it a great deal, and that it’s an opinion I hold seriously." - Douglas Adams (and I echo the sentiment)
September 1, 2014 at 6:03 am (This post was last modified: September 1, 2014 at 6:10 am by Anomalocaris.)
(August 31, 2014 at 9:30 pm)KUSA Wrote: The arrow of time only goes forward. The entropy of the universe can't be undone.
Going back I time does not imply entropy is undone. If you were to go for time B back to time A and change subsequent history, it seems entirely plausible that how you can change subsequent history is constricted by laws of physics to maintaining precisely the same amount of entropy increase in the new progression of time from A to B as in the original progression from A to B.
One possible explanation that has been advanced for why there are no traveler from the future in the present is the same time machine one uses to travel back in time must have already been operating at the destination time in order for time travel to be possible at all. a ie, a time machine can only transport you to any time in history after the time machine itself has already been built and turned on. If no time machine has been invented yet, then your will see no time traveler from the future because time travel to before the first time machine began operation is impossible.
But once the first time machine has been invented, built, and switched on, then time travelers for during the life span of the time machine may freely go back and forth to any time period when this machine has continuously operated.
(August 31, 2014 at 9:30 pm)KUSA Wrote: The arrow of time only goes forward. The entropy of the universe can't be undone.
Going back I time does not imply entropy is undone. If you were to go for time B back to time A and change subsequent history, it seems entirely plausible that how you can change subsequent history is constricted by laws of physics to maintaining precisely the same amount of entropy increase in the new progression of time from A to B as in the original progression from A to B.
One possible explanation that has been advanced for why there are no traveler from the future in the present is the same time machine one uses to travel back in time must have already been operating at the destination time in order for time travel to be possible at all. a ie, a time machine can only transport you to any time in history after the time machine itself has already been built and turned on. If no time machine has been invented yet, then your will see no time traveler from the future because time travel to before the first time machine began operation is impossible.
But once the first time machine has been invented, built, and switched on, then time travelers for during the life span of the time machine may freely go back and forth to any time period when this machine has continuously operated.
So, if there is a discontinuity in the operation of the machine, would time travelers forward of that discontinuity be able to travel further past that that discontinuity, or only back to the discontinuity?
Going back I time does not imply entropy is undone. If you were to go for time B back to time A and change subsequent history, it seems entirely plausible that how you can change subsequent history is constricted by laws of physics to maintaining precisely the same amount of entropy increase in the new progression of time from A to B as in the original progression from A to B.
One possible explanation that has been advanced for why there are no traveler from the future in the present is the same time machine one uses to travel back in time must have already been operating at the destination time in order for time travel to be possible at all. a ie, a time machine can only transport you to any time in history after the time machine itself has already been built and turned on. If no time machine has been invented yet, then your will see no time traveler from the future because time travel to before the first time machine began operation is impossible.
But once the first time machine has been invented, built, and switched on, then time travelers for during the life span of the time machine may freely go back and forth to any time period when this machine has continuously operated.
So, if there is a discontinuity in the operation of the machine, would time travelers forward of that discontinuity be able to travel further past that that discontinuity, or only back to the discontinuity?
What?
(August 21, 2017 at 11:31 pm)KevinM1 Wrote: "I'm not a troll"
Religious Views: He gay
0/10
Hammy Wrote:and we also have a sheep on our bed underneath as well
(September 1, 2014 at 1:12 pm)Endo Wrote: So, if there is a discontinuity in the operation of the machine, would time travelers forward of that discontinuity be able to travel further past that that discontinuity, or only back to the discontinuity?
What?
Arrow shows flow of time forward. If purple is when the machine STOPPED working for some time, but then was turned BACK ON, can someone in the red timezone travel to black, or only within red?
(August 31, 2014 at 6:18 pm)lifesagift Wrote: ..think about it... technology is bounding forward, splitting atoms etc..so let's guess that in the next 100 years we'll suss out anti gravity, and maybe invisibility in 300 years.. and maybe time travel in a thousand years time...? But if they discover time travel, they can then go into the future and discover more technical ways or improving it... so it will be easy to travel back in time... and then mass produce it for everyone almost as a recreation... so take that 10,000 years hence, with population increases.. surely most people that live in the future will be visiting ancestors in the past ?
So where are they?
The past and the future are mental constructs built from memory and prediction. They are not physical places that exist.
You cannot travel somewhere that does not exist.
MM
This is the truth. The fantasy of time travel only exists because people don't understand what time is.
![[Image: discontinuity_zps6e649814.png]](https://images.weserv.nl/?url=i1200.photobucket.com%2Falbums%2Fbb321%2FExo594%2Fdiscontinuity_zps6e649814.png)
![[Image: grumpy-cat-and-jesus-meme-died-for-sins.jpg]](https://images.weserv.nl/?url=1.bp.blogspot.com%2F-_GaCN-f8ZFo%2FUNfmimTyf4I%2FAAAAAAAANmk%2FoakT_wL319U%2Fs1600%2Fgrumpy-cat-and-jesus-meme-died-for-sins.jpg)
