Is the concept of spacetime logical?

[Anonymous]

Makaveli.....you don't grasp concepts easily, do you? The guy said "Time is relative. The entire universe could slow down and we wouldn't notice it, because we would be slowing down too."

Lemme just repeat one part of what he said, just so it will sink in, "we wouldn't notice it"....

The days would last "longer", but if the universe slowed down (and everything in it (including time)), then the days would still be 24 hours. It would just be a longer 24 hours than it was when the universe was faster. Get it yet?

this is mak, im just too lazy to log in...so what youre saying is that my statement was exactly right, days and years would, in fact, be longer...why do you insist on turning everything into an arguement...my track recors speaks for itself, if you do want to argue with me, you will lose

[AlbinoLime]

You don't have a track record, if you do then I have not seen it. Anyways, you are only half right, If the universe and everything in it slowed down then time would be measured in the same way. 24 hours will still take 24 hours to complete, but compared to the 24 hours before the universe slowed down the slower universes days would seem longer. Days and years would not be longer, they would take the same amount of time to complete. Now that I think about it, you are wrong.....and I won......

[makaveli121212]

The days would last "longer", but if the universe slowed down (and everything in it (including time)), then the days would still be 24 hours. It would just be a longer 24 hours than it was when the universe was faster. Get it yet?

you said it yourself nUb, now you contradict yourself...thats not the way to win...

[AlbinoLime]

The days would last "longer", but if the universe slowed down (and everything in it (including time)), then the days would still be 24 hours. It would just be a longer 24 hours than it was when the universe was faster. Get it yet?

you said it yourself nUb, now you contradict yourself...thats not the way to win...

Just read the second post I explained it better.

[Anonymous]

This post is going to be really long because im gonna draw a picture. THIS IS NOT SPAM!!
Ok, time actually is the 4th dimension. It works exactly like a dimension. If i were to tell you to meet me on the corner 52nd street(length) and ave 22 (width) on the 15th floor(height), you would immediately ask me, "when?" I would have to define for you a 4th coordinate for the "position" function (2:00 in the afternoon). that is how time exists in the universe; we made up the system of measure, but not time itself.
That being said, time dialation occurs because it is a dimension.

Pretend you are in a car going 50 kph in a straight line; you are moving in one dimension and it will take you 1 hour to go 50 km IN THAT dimension.

Finish ----------------------
^
| 1 hour
|
Start------------------------

Now you are going 50 kph at a 45 degree angle to your previous course. You are travelling for a "longer period of time" (heheh) to go the same distance IN THAT dimension.


Finish ---------------------
^
\
\ longer than 1 hour
\
Start ------------------------

Now extrapolate that pattern out to four dimensions. No one here can deny that we are travelling through time; we cant stop(easily). But when we move, we are using some of our "speed through time" to go in the other 3 dimensions. That is why time "moves slower" as you go faster. It is also why time stops when you reach the speed of light. ALL of your "time speed" is going into motion. Like so:

Finish -----------------

----------------------->

Start -------------------

You wil NEVER get to the finish line....

I hope that helps explain it logically.

[Anonymous]

Hrmm... my picures didnt come out right... *sigh*

[Thingy]

Grrr.... that was me by the way

[alainbryden]

nice triple post. but no.
Time was, like you said, invented by humans, but it is not a dimention just because we use it to specify meeting places and such. One could just as easily say "meet me at coordinates (334,123,049) with the center of the earth as the origin 'when' the earth is at coordinates (2930,192834,4321) with the center of the sun as the origin." Same concept as time, infact, the coordinates could represent the second, day, week, year, etc, but the system of "time" was invented to allow for a much more regular representation of the earths position relative to the sun. "time" is just the continuity of atoms, molecules, objects etc. reacting with eachother. This continuity cannot be altered.

[Thingy]

If there was no such thing as time then nothing would ever happen.
Only our units if measure were invented by us. There are still things that have happened, that are happening, and that will happen regardless if we believe time exists or not.

Also, your system of measure also relys on the fact that the system of the earth is the origin. You have specified a specific point in space. But regardless if you can describe the whole planet with that system, what about something that never moves, or some random point out there that has nothing in it. In order to define any given point as the origin, you must define it in the 3 space dimensions otherwise we have no idea where your starting point is and you havent truly differentiated your starting point from the rest of the universe. So really, in that system of measure, you still have 3 space dimensions and one time dimension, the space dimensions are just implied from the origin.

Also, by calling time a continuity, you have just defined the term dimension. Thats what all the space dimensions are also, continuities in 3 separate directions.

[Nightstar]

Thingy said it very very well, okay. Time IS the 4th dimension. you move throught it in EXACTLY the same way you move through the regular 3.

To explain this, try this. Sit in your chair, being very still. you are not moving in the regular 3 dimensions, but you are still moving through time, it may not "look" like the other 3, but it works the same way.

as for time dilation, let me put it this way, time is maleable, just like the other dimensions. if i was to go the speed of light(somehow) the trip would be instant. i would be like-im here at earth, 3,2,1, launch. okay, that was a nice trip, here i am all the way across the galaxy. i would be the same age. but time still passed. it would be 135,000 years later on earth. that is standard physics, it is fact. we are not changing the way we measure time, we are changing the way we MOVE THROUGH it. Time is relative to the perspective of the observer.

as for the black whole thing, the gravity from the black whole changes the way you go through time, it warps time, and makes you accelerate into it, so if you were falling into a black whole, and "survived" long wnough to reach high speeds, you could technically watch the entire infinity of time pass by you, or at least until you were destroyed. that is IF you could stay alive, which is highly suspect.

[suicidalmuskrat]

it depends

Makaveli.....you don't grasp concepts easily, do you? The guy said "Time is relative. The entire universe could slow down and we wouldn't notice it, because we would be slowing down too."

Lemme just repeat one part of what he said, just so it will sink in, "we wouldn't notice it"....

The days would last "longer", but if the universe slowed down (and everything in it (including time)), then the days would still be 24 hours. It would just be a longer 24 hours than it was when the universe was faster. Get it yet?

this is mak, im just too lazy to log in...so what youre saying is that my statement was exactly right, days and years would, in fact, be longer...why do you insist on turning everything into an arguement...my track recors speaks for itself, if you do want to argue with me, you will lose

actually this whole day arguments simply depends on whether or not you are talking about a sidereal day or a solar day...basically whether you define a day as 24 hours, or define it as the time it takes for the earth to make one rotation...obviously the correct way to define this would one rotation, in which case if everything slowed down a day would be longer from an observer outside the universe, but the same to us.

As for all this stuff about time travel--backwards time travel is not possible at all...forward time travel is not exactly possible, just living longer. Also, I don't care what cnn.com says, sound can not escape from the singularity of a black hole. black holes do emit some matter, and that matter could produce sound. And as for the pain question, i'm not really sure. I would think not, because our nerves don't relay information to our brain faster than the speed of light, and if light can't escpape, then neither could our nerve "transmissions".

None of this had to do with the original post, but neither have the last 3 pages, so i don't feel too bad.

[alainbryden]

Don't really have time to re-argue my point, but...

To explain this, try this. Sit in your chair, being very still. you are not moving in the regular 3 dimensions, but you are still moving through time, it may not "look" like the other 3, but it works the same way.

You are still moving throught three dimentions, constantly, you may not notice it because you are not moving relative to earth, but you are always moving relative to something. The example I used was the sun, but that's only because that's what humans used to invent time in the first place. You could use my measure of time with any point as the origin, because time is, as you said, relative :P

if you were falling into a black whole, and "survived" long wnough to reach high speeds, you could technically watch the entire infinity of time pass by you, or at least until you were destroyed. that is IF you could stay alive, which is highly suspect.

That's cool

[Nightstar]

alainbryden, of course you are still moving in the 3d, you can never stop moving. It was just an example. Shit, if you calculate in the speed of the galaxy, and the speed of earth, we are probably moving pretty quick. Thats a thought.

Quote:
if you were falling into a black whole, and "survived" long wnough to reach high speeds, you could technically watch the entire infinity of time pass by you, or at least until you were destroyed. that is IF you could stay alive, which is highly suspect.


That's cool

yea, it is. Who want to go jump into a black hole?

[Anonymous]

i think the idea you are having a problem with is the reletive part yes times does speed up and slow down and they are even finding that even in some spots a foot by a foot that time may be travling faster then it is next to it.
the big problem is we live in the 3rd demention and to be able to mesure time in anyway that we are not in it we have to be in the 4 demenion se yes we can say its been a second and the person at the begging was kind of right cuz we are stuck in the 3rd demention and stuck in the time getting longer and shorter with us in it then our meshurment doesnt change here in the 3 demention "Reletivity" but if you were in the 4th you would beable to step out of time. then you could see the time speeding up and slowing down in spots but since everything is reletive here we cant few more things about the 4 demention if you can get into it and since you can step out of time you could come back into the third demention at any time you wanted. also you dont have to travel threw the third demention when you go into the 4th you can travel without time there by connecting any and all spots on the 3d. demmnion now the even more confusing part. with there being no time and no distance out side the third demention you can be in two places at once in the third dementions or you could be everywhere in the third demention.. it is also thought that there may be a "higher being" rember moth man profices there ya go

[Nightstar]

oh.my god. I.... um. er. ouch.


what the hell are you talking about? I....my eyes!