Yes, but what is the universe expanding into. ;)
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Yes, but what is the universe expanding into. ;)
The universe is surronded by a large bubble...It won't let you in or out. Just IMO.Quote:
Originally posted by slavik
by "end" I mean when you get to the edge of the universe.
What do you think would happen to a thing that tried to go "out" of the universe?
From what I understand:
There is a cosmolgical constant which is given the symble omega. If omega is less than 1, the universe will contract. If omega is greater than 1 the universe will expand forever. From our observations, omega appears to be very close to 1.
If you were able to somehow go fast enough to leave our universe, you would have no laws of physics, since the laws of physics were created when our universe exploded fromt the big bang
Of cousre, there is a new theory which is mathematically based on M-theory. It says that parrallel branes are bouncing off each other and cause our universe to exist. This theory would get rid of the troubling "singularity" because in this theory, there would never be a beginning and time would be infinite. The universe would be created from it's own ashes.
you put a quarter in the juke box & you get to hear jim morrison singing 'break on thru to the other side'
http://www.cosmiverse.com/space01170204.html
What's on the other side of the bubble? Just...nothing?Quote:
Originally posted by DuronFanatic
The universe is surronded by a large bubble...It won't let you in or out. Just IMO.
According to Stephen Hawking, the universe has no boundary but is finite. Thats a difficult concept to think of in 3 dimentions, but in two its like the surface of the earth (or a balloon). Walk in any direction on earth and you will eventually end up right back where you started. An expandind universe can be seen like an expanding balloon (which is what we see).
Dont think of it as just a bubble. Think of our universe as a warped piece of space-time. If you travel in a straight direction long enough, strange things will happen (ie. either you'll arrive where you started, you'll cease to exist, time will not pass for you, or time will pass infinitely fast for you, etc...) Since space-time becomes too warped before you reach the edge of the universe, there isn't a physical and definate edge you could approach. However, the universe does have a boundary which would explain why its expanding.Quote:
Originally posted by CadetLee
What's on the other side of the bubble? Just...nothing?
However, I never took any advanced physics courses. This theory just makes the most sense to me.
:confused:Quote:
Originally posted by hu flung dung
Dont think of it as just a bubble. Think of our universe as a warped piece of space-time. If you travel in a straight direction long enough, strange things will happen (ie. either you'll arrive where you started, you'll cease to exist, time will not pass for you, or time will pass infinitely fast for you, etc...) Since space-time becomes too warped before you reach the edge of the universe, there isn't a physical and definate edge you could approach. However, the universe does have a boundary which would explain why its expanding.
However, I never took any advanced physics courses. This theory just makes the most sense to me.
This is getting a bit too complex for me...
Has anybody actually managed to do some experiments with space-time stuff, or is this all hypothetical mathematical calculations?
This is strange..but if everything starts distorting, what if logic/math itself distorts, so 2 + 2 != 4?
Hmmmn this space-time bending made me cough up this 5 minute theory (real-time theorie took 27 seconds or there-abouts):Quote:
Originally posted by hu flung dung
Dont think of it as just a bubble. Think of our universe as a warped piece of space-time. If you travel in a straight direction long enough, strange things will happen (ie. either you'll arrive where you started, you'll cease to exist, time will not pass for you, or time will pass infinitely fast for you, etc...) Since space-time becomes too warped before you reach the edge of the universe, there isn't a physical and definate edge you could approach. However, the universe does have a boundary which would explain why its expanding.
However, I never took any advanced physics courses. This theory just makes the most sense to me.
What if there was this giant, infinite if you will, "piece" of warped space time, and what we experience the universe to be, is the unwarped part, and the expansion of the universe is actually the "unwarping of the warped", but as stated, neither we, nor anything that has been "unwarped" (or warped if you're on the other side, but I'll not get into that) can get to/from that other side (imcompatible states of warpedness, let's call it that), so we cannot perceive what is beyond the universe, allthough is much there to be found, being not in the state we're in.
(I hope I made myself clear :D)
Quote:
Originally posted by CadetLee
This is strange..but if everything starts distorting, what if logic/math itself distorts, so 2 + 2 != 4?
lol. Reminds me of one of my homegrown theories back in my undergrad days. I was convinced that our numbering system is not natural. I think I was contemplating the nature of fundamental constants like Plank's constant - which appears everywhere and in the most unexpected places. My theory was that the "natural" numbering system of the universe would be such that all the fundamental constants would be integers and what we call '1' now would probably be some strange large number. Considering that most of the fundamental constants are rounded to 9 significant units, in my imagined natural numbering system, 2+2 would most certainly be a little off from 4. :rolleyes:
(Well, I was a little whacky then. So shoot me.) :p
The topic of time travel has fascinated me for years...it all started by watching back to the future numerous times....so what do u guys think..is it possible?..if not now perhaps in the future??...i would surely like to undo some stupid mistakes that i made :P
No. It breaks Einstein's relativity.
So what? Every scientific "theory" is not correct. Many "laws" have been proven to be wrong as technology and human kind advances. So the only conclusion you could come to is that time travel is not probable because it breaks Einstein's relativity model. But, all together possible.Quote:
Originally posted by russ_watters
No. It breaks Einstein's relativity.
Personally I don't think time travel is possible either. Time is based on a concept we as humans made...
i dont think anyone honestly knows. there are some theories that forbid time travel but really who knows for certain?Quote:
Originally posted by akbar
The topic of time travel has fascinated me for years...it all started by watching back to the future numerous times....so what do u guys think..is it possible?..if not now perhaps in the future??...i would surely like to undo some stupid mistakes that i made :P
anyway there is a way to kind of travel to the future. just go near the speed of light. if you can go fast enough for say 1 second of your time to equal to 999 years on earth, go for 1 second and you could say you travelled to the year 3001 ad LOL
How would you even travel back in time?
I seriously doubt you can. Unless "time" is a constantly shifting series of parallel universes, all static in their moment of existence.Quote:
Originally posted by clickx17
How would you even travel back in time?
Know one will really know until we formulate a quantuum theory of gravity. Going back in time would create a lot of problems (Kill your grandfather and you wouldn't be born, so you couldn't kill your grandfather).
why gravity?Quote:
Originally posted by elimc
Know one will really know until we formulate a quantuum theory of gravity. Going back in time would create a lot of problems (Kill your grandfather and you wouldn't be born, so you couldn't kill your grandfather).
Gravity is the only force we don't have a quantum theory for. Once we understand gravity, all the other theories should fit into place like a puzzle. Without gravity, we can only factor in time travel using the other 3 forces and so our equations couldn't take into account of the effects of quantum gravity.
You see, without knowledge of quantum gravity, there are too many variables in the time travel equations. Anything thought up now would be incomplete at best.
It doesn't seem possible.
I could see maybe the future, but I dont think you could travel back in time before the invention of the time machine.Quote:
Originally posted by clickx17
How would you even travel back in time?
I think it might be possible, but not in my lief time.
to the contrary, it is based on einstein's relativity. As you approach the speed of light, time slows down until it would stop at lightspeed. So if you travelled 50 lightyears away from earth and then 50 lightyears back at the speed of light, 100 years would pass on earth while you wouldn't pass any time at all.Quote:
Originally posted by russ_watters
No. It breaks Einstein's relativity.
i think we all agree with that :) (maybe not the @ light speed part but that's beside the point.) i think mainly they are investigatng the possibility of travelling back in timeQuote:
Originally posted by avatar4277
to the contrary, it is based on einstein's relativity. As you approach the speed of light, time slows down until it would stop at lightspeed. So if you travelled 50 lightyears away from earth and then 50 lightyears back at the speed of light, 100 years would pass on earth while you wouldn't pass any time at all.
how that is not allowed by relativity i dont nkow
Quote:
Originally posted by avatar4277
to the contrary, it is based on einstein's relativity. As you approach the speed of light, time slows down until it would stop at lightspeed. So if you travelled 50 lightyears away from earth and then 50 lightyears back at the speed of light, 100 years would pass on earth while you wouldn't pass any time at all.
I think he was referring to the fact that although Einstein's theory of relativity allows different observers in different reference frames to measure a different time for the same event even to the extreme where they may disagree on the sequence of two events. For example: one observer may see event 1 happen and then event number 2 though another may see event 2 happen first. This only applies to events that are not caused by each other. For example, if event number 2 is caused by event number one it is impossible for any observer to see the effect (event 2) happen before the cause (event 1). Though this won't allow you to travel back in time, you can travel forward in a fashion that was already mentioned (By going real fast)
i've heard of time experiments where they have 2 clocks set exactly the same, then send one to outer space, comes back, and its off from the other clock by a fraction of a second.Quote:
Originally posted by CadetLee
:confused:
This is getting a bit too complex for me...
Has anybody actually managed to do some experiments with space-time stuff, or is this all hypothetical mathematical calculations?
This is strange..but if everything starts distorting, what if logic/math itself distorts, so 2 + 2 != 4?
btw, i'm prety stoned :) , so this seems extra interesting!