What do you mean? Popular Science is still a respectable publication, they just take the scientist research and put it into terms regular people can understand. The article explained the different ways in which time travel is possible and who are we to second guess it? They got the information from the scientists who know about this stuff.
This is all find and dandy (hehe, i've always wanted to say that) if you believe in the concept of time. Time and space are the same. As for travelling back in "time" through a wormhole or going faster than the speed of light, well, that is sorta true.
Lets say a person can travel 10,000 light years in 1 second. Looking in space, those 10,000 light years happened 10,000 years ago. So you are travelling 10,000 years in the past (aka different space). Lets say the person stays there for 1 minute. On earth, they would see the person who looks to be 10,000 years away. Now a person goes back to Earth. 1 minute and 2 seconds have passed on earth time and the person has travelled the distance of 20,000 years worth of light. That's going faster than the speed of light, but absolute time hasn't changed. not sure if it's correct, but think of the concept of time as a change in space.
Now, you could always travel to a dimension where the only change that happened is a hydrogen atom in some far off system was moved 1x10^-18 m. Everything on that earth would be exactly the same and a person could mess with that. But that's if you believe that multiple dimension were created when the big bang occurred (I forgot the name of this theory).
As for travelling into our past and handing a BFG to abe lincoln... I do not think it is possible. Oh wait, there is 1 theory that I read about where you would have to create a beginning point (essentially a point of coordinates that acts a signal) in space-time so that future peoples can go 'back' to this point. I forgot the name of this theory also, sorry.
I might not all be here, I just worked out and ate... so all my blood is circulating in my system and not all up in the brain
Lets say a person can travel 10,000 light years in 1 second. Looking in space, those 10,000 light years happened 10,000 years ago. So you are travelling 10,000 years in the past (aka different space). Lets say the person stays there for 1 minute. On earth, they would see the person who looks to be 10,000 years away. Now a person goes back to Earth. 1 minute and 2 seconds have passed on earth time and the person has travelled the distance of 20,000 years worth of light. That's going faster than the speed of light, but absolute time hasn't changed. not sure if it's correct, but think of the concept of time as a change in space.
Now, you could always travel to a dimension where the only change that happened is a hydrogen atom in some far off system was moved 1x10^-18 m. Everything on that earth would be exactly the same and a person could mess with that. But that's if you believe that multiple dimension were created when the big bang occurred (I forgot the name of this theory).
As for travelling into our past and handing a BFG to abe lincoln... I do not think it is possible. Oh wait, there is 1 theory that I read about where you would have to create a beginning point (essentially a point of coordinates that acts a signal) in space-time so that future peoples can go 'back' to this point. I forgot the name of this theory also, sorry.
I might not all be here, I just worked out and ate... so all my blood is circulating in my system and not all up in the brain
Not being a physics major, I certainly don't understand everything involved. However, I firmly believe in a universe controlled by cause and effect. To claim true randomness claims that you can have an effect with no cause. Essentially, that things happen for no reason. If there was a reason, then you could eventually find out what that reason is, and then predict the effect, and thus it would not be truly random. The idea of something just happening without any cause seems to violate every aspect of science. But perhaps I do not fully understand the concepts involved, this is JMHO of course.
Einstein felt the same way, hence his protest, "God does not play dice with the Universe."
Still, both Quantum Theory and actual experiment appear to show that one must accept either randomness or superluminal influences.
I'm not saying that you're wrong, just that your belief puts you into the "Hidden Variables" camp, as opposed to both the proponents of the "Copenhagen Interpretation" and the "Many-Worlds" supporters.
I myself subscribe to a modified version of the "Many-Worlds" interpretation, in which every past that could lead to the now does so, every future that can proceed from the now does so, and the Heisenberg "uncertainty" relations provide a measure of the size of the "window" of the now -- without which "window" we would be in the clockwork Universe of Newton.
But that's just me.
my question is, if you go back in time and appear at a certain point in space, what happens to the stuff that was occupying the space before you came?
If you're interested in a good fictional treatment of time travel, check out The Man Who Folded Himself by David Gerrold.
It really is "the last word in time-machine novels".
It really is "the last word in time-machine novels".
Jeff7
Lifer
- Jan 4, 2001
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"That's why scientists increased the speed of light in 2208."
Professor Farnsworth of Futurama
I wonder about this, and one theory I've come up with - once you leave your own time, and go to the past, you're there, and what you do there to affect your future self won't matter, since you exist in the current time (which is the past). You prevent life from forming right there, but you would still exist.
The travel back could be bad though, depending on how you travel. If you go through time by simple acceleration or reversal of time, then the timeline would play out - you'd cease to be created at some point, and therefore cease to exist. If you travel by popping outside of the timeline, and jumping back in, then you should be safe - then you'd probably pop back into a lifeless future, but you'd be fine.
I also believe this - our perceptions of randomness stem from our inabilty to know everything about a certain phenomenon at a certain point in time. These gaps in our information mean that we can't accurately predit what is going to happen to something, and do so in realtime.
While this may be true of processes like the lottery-ball mixing that was discussed earlier, it is not the case with respect to randomness at the quantum level. Heisenberg's lower-limit on the uncertainty in the simultaneous measurement of position and momentum of a particle is not due to our ignorance, but rather to the fact that the particle does not even possess a definite position and momentum simultaneously.
To paraphrase a baseball umpire (as others have done), "Some pitches are balls, and some are strikes. But none of them are anything until I call them." The ball-ness or strike-ness of a pitch is not a property of the pitch alone, but rather it is a property of the pitch/umpire system. It's not that we are ignorant of the ball-ness or strike-ness of the uncalled pitch -- it's that the pitch alone doesn't possess a definite ball-ness or strike-ness.
Here's one to think about... you people who are saying that if you just went back, to spectate an event...
You travel back in time. Let's say, for ease of explanation, that we'll forget how you even got there (e.g. *poof* and scare the heck out of everyone nearby, etc etc).... and you went back to see, say a car accident, someone had mentioned....
The car crash happens, as it did the first time. Satisfied that you did not tamper with the past, you get in your time machine, and go back to the future. Oh crap! Everything is different! What happened?
Things that you cannot possibly take into account happened when you watched that car crash: you breathed, gave off thermal energy, made sound, changed gravity(according to some theories), lost a few hairs, little seemingly insignificant atom sized pieces of your shoes rubbed off onto the sidewalk where you were standing, i can go on and on for hours....
Say you stepped on an ant accidently(or didn't even notice). The ant might've supposed to have been at a certain place down the street in an hour, to bite the leg of a person, who was about to run into a liquor store and rob it. The man flees, and runs into some guy, who drops his groceries, which the person coming his way stops and helps to pick up, which causes this guy to be late for a bus, which causes........and so on. You see how much you have changed the future, just by doing that teensy little thing?
(Leave it to me to use street crime to illustrate an idea i have)
You travel back in time. Let's say, for ease of explanation, that we'll forget how you even got there (e.g. *poof* and scare the heck out of everyone nearby, etc etc).... and you went back to see, say a car accident, someone had mentioned....
The car crash happens, as it did the first time. Satisfied that you did not tamper with the past, you get in your time machine, and go back to the future. Oh crap! Everything is different! What happened?
Things that you cannot possibly take into account happened when you watched that car crash: you breathed, gave off thermal energy, made sound, changed gravity(according to some theories), lost a few hairs, little seemingly insignificant atom sized pieces of your shoes rubbed off onto the sidewalk where you were standing, i can go on and on for hours....
Say you stepped on an ant accidently(or didn't even notice). The ant might've supposed to have been at a certain place down the street in an hour, to bite the leg of a person, who was about to run into a liquor store and rob it. The man flees, and runs into some guy, who drops his groceries, which the person coming his way stops and helps to pick up, which causes this guy to be late for a bus, which causes........and so on. You see how much you have changed the future, just by doing that teensy little thing?
(Leave it to me to use street crime to illustrate an idea i have
)when you remember an event that occurred in the past, you are in a way observing it.
do things change once you have finished thinking about it?
Having observed things of past contaminate us, and our futures will be shaped because of them. If we think about where we will be, then we can see how our observations have affected our past.
there is no difference in observing actions in the past that we did not witness, and remembering actions that we did witness.
both may or may not have an effect on our futures, but will not affect our current state of being. Only those that witness actions in the present will exert consequences on our pasts.
all said, things will occur the same way in an infinite loop, since only the future can be changed.
do things change once you have finished thinking about it?
Having observed things of past contaminate us, and our futures will be shaped because of them. If we think about where we will be, then we can see how our observations have affected our past.
there is no difference in observing actions in the past that we did not witness, and remembering actions that we did witness.
both may or may not have an effect on our futures, but will not affect our current state of being. Only those that witness actions in the present will exert consequences on our pasts.
all said, things will occur the same way in an infinite loop, since only the future can be changed.
Originally posted by: zsouthboy
Here's one to think about... you people who are saying that if you just went back, to spectate an event...
You travel back in time. Let's say, for ease of explanation, that we'll forget how you even got there (e.g. *poof* and scare the heck out of everyone nearby, etc etc).... and you went back to see, say a car accident, someone had mentioned....
The car crash happens, as it did the first time. Satisfied that you did not tamper with the past, you get in your time machine, and go back to the future. Oh crap! Everything is different! What happened?
Things that you cannot possibly take into account happened when you watched that car crash: you breathed, gave off thermal energy, made sound, changed gravity(according to some theories), lost a few hairs, little seemingly insignificant atom sized pieces of your shoes rubbed off onto the sidewalk where you were standing, i can go on and on for hours....
Say you stepped on an ant accidently(or didn't even notice). The ant might've supposed to have been at a certain place down the street in an hour, to bite the leg of a person, who was about to run into a liquor store and rob it. The man flees, and runs into some guy, who drops his groceries, which the person coming his way stops and helps to pick up, which causes this guy to be late for a bus, which causes........and so on. You see how much you have changed the future, just by doing that teensy little thing?
(Leave it to me to use street crime to illustrate an idea i have
My point was that you can't "change" the future, because it is already the future. So let's say you just went back somehow, like you said. Let's say (just to keep track of what's going on) that it is 2003 in the "present", and you go back to the past, say, 1950 and watch that car crash and somehow affect something which "changes" the future. But in 2003, whatever you did in 1950, you already did it. From your point of view your actions in 1950 come after your actions in 2003, but to someone who lives through 1950 and 2003, they would see you first in 1950, then in 2003. To them (and the rest of the world) you would watch the car crash, then travel back in time. Whatever you did in 1950 could not change the future, it could only affect it. The future wouldn't exist yet, so you can't "change" it. And whatever the future exists as in 2003, you already affected it by doing whatever you already did in 1950.
I suppose this is kind of confusing, but to me that makes sense. Of course since we don't actually know how (if at all) time travel would work, we can only guess.
I've read that if a material suspended in a death star or ghost star or black hole, it will not travel it's age, but it will shrink it's mass.
My point is, there is no scientifical fact (includes einstein relativity theory) that mass can travel back trough time.
since the universe is moving with it's age, we can only stop or reduce the "aging".
But my beliefs says that "time" is one of God creation. Imagine how huge the energy to create, since it takes a lot of energy to stop mass aging (just like moving backward of a train, it takes a lot to run your legs and much bigger to run the train). If we can stop universe aging, we can start moving backward time.
otherwise, we had to move time faster than universe aging, and that's all about PURE ENERGY - non mass.
so, anyone will propose God to stop universe aging ?
or anyone have the resource ? (inf : to reach light speed with a pure mass-energy conversion roughly takes about half of the previous mass. m.v2/2 = Am.c2)
but anyway, if we can travel backtime, we can put an "UNDO" icons on street just like a phone booth. and all you have to do is use a kind of credit card to activate this thing.
actual light speed is not a constant anymore too, since it was made from time factor. another fact is that light can bent if it goes near a ghost star.
My point is, there is no scientifical fact (includes einstein relativity theory) that mass can travel back trough time.
since the universe is moving with it's age, we can only stop or reduce the "aging".
But my beliefs says that "time" is one of God creation. Imagine how huge the energy to create, since it takes a lot of energy to stop mass aging (just like moving backward of a train, it takes a lot to run your legs and much bigger to run the train). If we can stop universe aging, we can start moving backward time.
otherwise, we had to move time faster than universe aging, and that's all about PURE ENERGY - non mass.
so, anyone will propose God to stop universe aging ?
or anyone have the resource ? (inf : to reach light speed with a pure mass-energy conversion roughly takes about half of the previous mass. m.v2/2 = Am.c2)
but anyway, if we can travel backtime, we can put an "UNDO" icons on street just like a phone booth. and all you have to do is use a kind of credit card to activate this thing.
actual light speed is not a constant anymore too, since it was made from time factor. another fact is that light can bent if it goes near a ghost star.
When you get finished, move on to "The Universe in a Nutshell" and then "The Future of Spacetime" which he co-authored. Both are as intriguing as "Brief History of Time" although a bit more difficult to read.
Terrible relativistic effects will befall you...
By causality of a physical system, a time machine cannot travel back further than the point in time when it became functional. Of course, "spooky" things happen when time and space dance.
I was going to get those books, but Amazon.com raised the price before I could buy them. They do sound interesting.
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