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TheAsgard
Adventuring Hero
Wise and helpful being
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posted August 22, 2005 01:46 PM |
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Time Travel etc.
Is it Possible?
I would like to know what are peoples opinions about the possibilities of time travel and to hear about the different views heard about time anomoly's.
Possible topics are the Paradox theory; which is if you travel back in time and kill your grandfather either accidently or on purpose, What happens to you? does that mean you will not be born? but how can that be if you just travelled back in time! Maybe its because their are parallel universes.
What about the possibility of hyperspace travel (faster than light travel) will it ever be possible?
There is also Distortion of time; When a planetary body nears a black hole all time itself slows down causing a Time Dialation Feild.
What are your views?
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Romana
Responsible
Supreme Hero
Thx :D
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posted August 22, 2005 03:05 PM |
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I don't believe in timetravel and even if it were possible I wouldn't want to do it. You never know what the consequences are. Same thing with wishing.
Timetravel to the future is different I guess. Haven't given it too much thought really.
Interesting subject nonetheless 
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The darkest skies show the brightest stars
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k1ng
Promising
Famous Hero
of Night Elves
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posted August 22, 2005 06:31 PM |
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dude, on Futurama there was an episode about this, if you wathced it. they travel back to time, Fry finds his grand ancester, as a soldier at USA army. Fry tries to save him from dangers, but at the end his ancester dies at explosion. he goes to his ancester's girlfriend and tells her the bad news, then she invites him over to her house. next day his friends find him in her bed, and Fry realizes that he, himself is his own grandfather. weird :/.
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terje_the_ma...
Responsible
Supreme Hero
Disciple of Herodotus
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posted August 22, 2005 11:55 PM |
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Wouldn't it be possible to call that "ancestor's girlfriend" "his granmother" instead? Or are only men valid as ancestors? 
Anyway, I hope that time travel is not possible, since I fear that some fool(s) with too good intentions might want to abuse it to "make the past right", by which they could endanger God-knows-what. Whether or not it would be possible, though, I am too unschooled in advanced physics to speculate about. I cancelled my subscription to various popular scientific magazines quite some years ago, for some reason...
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"Sometimes I think everyone's just pretending to be brave, and none of us really are. Maybe pretending to be brave is how you get brave, I don't know."
- Grenn, A Storm of Swords.
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Lord_Woock
Honorable
Undefeatable Hero
Daddy Cool with a $90 smile
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posted August 23, 2005 12:14 AM |
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One question.
If time travel is possible, why don't we see time travellers milling about all the time?
Answer:
Because nobody made a working receiver yet.
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Yolk and God bless.
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My buddy's doing a webcomic and would certainly appreciate it if you checked it out!
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Lord_Pc
Promising
Famous Hero
Groin-Grabingly Clever
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posted August 23, 2005 12:16 AM |
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theoretically everything is possible u just need to now how
and yes i believe time travel is possible with the right equipment
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Da-da-dada-HEY-dada-da-da
Two goldfish were in their tank. One turns to the other and says, 'You man the guns, I'll drive.'
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Svarog
Honorable
Supreme Hero
statue-loving necrophiliac
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posted August 23, 2005 02:05 AM |
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Time travel is possible. Theoretical physics provides for such possibility, but not in the sense that we usually understand it, as is exploited for commercial purposes. The key idea (for rookies) is to redefine how they understand the concept of time. Time is not an absolute property of reality, but relative for every person, body or particle. Thus, each body has its own relative time and under certain conditions, we can adjust ("haste" and "slow") these relative times and alter the time coordinates in relation to one another. What it means in practice is that I can get into a rocket, hit gas until I reach near c velocity and when i come back i'll be younger and everyone on earth will be older. As to how much, depends on the velocity and distance, but there is no end limit. (hardcore theory provides for even as much as millions of years)
However, time travel in the past is not possible, at least under current understanding. This doesnt ultimately exclude the possibility, but unless Einstein's theory of relativity is fundamentaly redefined (nothing of that i see coming in the near future), it seems like altering the past is both logical and scientific paradox.
Read this thread Understanding Relativity if you want to learn just why is time travel an option and ask any science-related quations or further (re)explainations u might need there.
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The meek shall inherit the earth, but NOT its mineral rights.
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Conan
Responsible
Supreme Hero
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posted August 23, 2005 03:40 AM |
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Edited By: Conan on 22 Aug 2005
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I also would like to say that we see the past right this instant. Indeed, when we look at the stars, we see what they where thousands of years ago. So in a sense, we are looking at the past and so we could argue that we are in the past of those stars.
This brings me to a second point. The reason we see the past is because the light of those stars took some time to get to us. This means that if we go faster than light, we can go back in time even more. Furthermore, if we where to leave earth at the speed of light and look back, we would see earth's past, since we went faster than the light that came out of earth. For example if we went much faster than light and for a long enough ride, we would be able to see the dinosaurs on earth.
Thirdly, it has been known that the faster we go, the more there happens to be a time differential. Indeed, we know that 2 atomic clocks that where perfectly syncronized and then one went on a flight on the shuttle and the other stayed on earth, had a time difference when we compared the 2 after the trip. This reinforces point #2.
Finally, I beleive it is possible to look back in time, but not to interact with the past or the future, only to look at it in contemplation and learn from it. If it where possible to go back in time, there would be proof of that and it would be a living reality. Plus the fact that there are way to many loopholes to take into consideration when thinking about time travel - to many variables.
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Your life as it has been is over. From this time forward, you will service.... us. - Star Trek TNG
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Jebus
Promising
Supreme Hero
TheJester akaJeebs akaJebfoo
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posted August 23, 2005 03:51 AM |
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I would have to agree with those who fear time travel...
what would interest me quite a bit and would "save" time is the concept of teleportation. (since we're exploring startrek theories here )
If we could travel from one place to another in the blink of an eye through "teleporters", the worlds multicultural beauty would be something we could all share and explore.
Medicine, food and supplies would be only seconds away. Plus, why should it be so difficult to visit those we love simply because they live away from us?
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"You went over my helmet??"
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Svarog
Honorable
Supreme Hero
statue-loving necrophiliac
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posted August 23, 2005 04:05 AM |
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Quote:
This brings me to a second point. The reason we see the past is because the light of those stars took some time to get to us. This means that if we go faster than light, we can go back in time even more. Furthermore, if we where to leave earth at the speed of light and look back, we would see earth's past, since we went faster than the light that came out of earth. For example if we went much faster than light and for a long enough ride, we would be able to see the dinosaurs on earth.
In the name of all sane science, I have to intervene. This passage is totally incorrect. You cant go fastr than light. Even if you did, you cant "catch up" the light that came out from earth billion years ago. Its just plain silly.
Besides, "seeing" the past thanks to travelling light is NOT how we do time travelling. Its a totally different theoretical concept that has nothing to do with perception, but enables actual time travel. See "Understanding Relativity" thread, focusing on the part of understanding a bit more.
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The meek shall inherit the earth, but NOT its mineral rights.
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Conan
Responsible
Supreme Hero
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posted August 23, 2005 03:09 PM |
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Edited By: Conan on 23 Aug 2005
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Relax.
As it stands, we are talking pure fictionnal, are we not? I mean, one could say that talking about time travel is silly and with the current physics, as you say, in all the name of sane science, impossible. So if we are talking pure fiction, isn't it interesting to talk about what could happen if we did go faster than light? And I know this has to do with time travel, not time perception, that's why I said what I did in my conclusion: It is possible to view the past, but not intervene. Of course, that is my opinion.
Besides, I never said it was possible to go faster than light, only that if we could, we'd go back in time; which is a good enough reason why it's impossible
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Your life as it has been is over. From this time forward, you will service.... us. - Star Trek TNG
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Svarog
Honorable
Supreme Hero
statue-loving necrophiliac
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posted August 24, 2005 03:26 AM |
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"As it stands, we are talking pure fictionnal, are we not?"
No, i'm talking pure science.
"I mean, one could say that talking about time travel is silly and with the current physics, as you say, in all the name of sane science, impossible."
Probably one who doesnt know/understand science.
Theres a difference between opinion, speculation and fact.
PLease do speculate on what would happen in situation which arent scientifically explored, but if you are to speculate on situation for which science has a pretty good idea how they work, be prepared to stand corrected, if its not in accordance with what science discovered. Nothing personal in here, its just the way people discuss when ego guards are down.
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The meek shall inherit the earth, but NOT its mineral rights.
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TheAsgard
Adventuring Hero
Wise and helpful being
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posted August 24, 2005 02:07 PM |
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What about the Time Dialation Field theory?
This is when a planetary body that is slowly being pulled into a black hole experiences a slow in it time. This Dialation Field slows the time two up to 600%. So in theory if a space craft travels past that planet (not that any sane persons would) by the time being finally sees that craft they would be looking at thier past would they not? :idea
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mr_niceguy
Famous Hero
of power
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posted August 24, 2005 02:22 PM |
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my opinion
no they would not, to look at your past you would actually have to travel to the past, or have the past travel to you. when you get close to a black hole time slows down but does not go backwards, it just keeps geting slower the closer you get. even when you reach the middle its just really really slow.
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a stich in time saves nine... what the hell does that mean?
If u enjoy telling ur friends of how uve never been beaten with ur own legs, u'd rethink making a comment
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Conan
Responsible
Supreme Hero
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posted August 24, 2005 03:18 PM |
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Svarog,
Then you are saying that scientifically speaking, time travel is possible. If so, please explain how.
To me, all of this is speculation, since time travel is not possibility with the science we know right now.
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Your life as it has been is over. From this time forward, you will service.... us. - Star Trek TNG
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Svarog
Honorable
Supreme Hero
statue-loving necrophiliac
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posted August 25, 2005 02:17 AM |
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Quote:
What about the Time Dialation Field theory?
This is when a planetary body that is slowly being pulled into a black hole experiences a slow in it time. This Dialation Field slows the time two up to 600%. So in theory if a space craft travels past that planet (not that any sane persons would) by the time being finally sees that craft they would be looking at thier past would they not? :idea
Ok, i’ll try to make a coherrent response out of this.
When a body approaches a black hole it does “experience a slow in time”, but, big but, in relation to what… No measure in physics has a sense unless you specify the reference system. In our case, the body experiences a slow in time in relation to distant observers. (this is not knit-picking!)
The “dilation field”, as you call it (or the ergosphere), is the space-time field that is located just outside the event horizon (which is the radius around the black hole where light cant escape). This ergosphere is area where the space-time continuum is pretty bent and that is the reason why the effects of the theory of Relativity are highly present (as you said, up to 600%, but even higher, up to infinity, i.e. time stops on the very border between the event horizon and the ergosphere)
Now, in your example, the spacecraft passing by the black hole, would experience an ordinary time dilation in relation to another distant observer. But this doesn’t mean anyone would be looking in their past, or other peoples past (this is impossible, since the time not being absolute, the past of observed objects cant be seen even in the most highly hypotetical situation. What you see is always the present, minus the time needed for the light to reach you, that is). It just means that other observers would see everything happening on that space craft slowed down. Eventually when, or better said, if the space craft returns from its venture the crew could return slightly aged, while everything else on their planet would be older than them. With the right flight coordinates, they can come back some 2000 years well into the future.
Now what would happen if you cross the event horizon is worth speculating. Some scientists believe that you reduce to a dimensionless singularity (!!!), if anyone’s got a clear idea what it means. Others (like Stiven Hawking for one) say that its possible there to be wormholes leading to paralel universums where all matter that is sucked in the black hole is “spewed out” on the other side.
Quote:
Svarog,
Then you are saying that scientifically speaking, time travel is possible. If so, please explain how.
Well, i have been all this time. Have you already read the relativity thread? I’d be willing to answer any question you might have there.
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The meek shall inherit the earth, but NOT its mineral rights.
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