*Marmite* Posted November 23, 2002 Share Posted November 23, 2002 many of the threads which discuss theories of space/gravity etc. use the phrase "space-time". can anyone please give me a simplish definition of this for it is a concept i havent come across at all before. grateful for any response Link to comment Share on other sites More sharing options...
fafalone Posted November 23, 2002 Share Posted November 23, 2002 Space is everything around us, and time is ...time. Think of a graph with time on the x-axis, and space on the y axis. We exist on the line y=x Link to comment Share on other sites More sharing options...
Katie Posted November 23, 2002 Share Posted November 23, 2002 What exists around x=y? What lies not on our line? Link to comment Share on other sites More sharing options...
aman Posted November 23, 2002 Share Posted November 23, 2002 Space is x y z, space-time is x y z today. Just aman Link to comment Share on other sites More sharing options...
*Marmite* Posted November 23, 2002 Author Share Posted November 23, 2002 starting to understand. am i right in saying that at the beginning of the y=x line, that was the start of the universe? and as time increases space also increases or expands? Link to comment Share on other sites More sharing options...
fafalone Posted November 23, 2002 Share Posted November 23, 2002 We're not sure if the universe will always be expanding, the point of the graph is just to illustrate how one cannot exist without the other. Link to comment Share on other sites More sharing options...
blike Posted November 24, 2002 Share Posted November 24, 2002 Imagine us traveling infinitly forward with the equation y=x. Now, say we start traveling through space faster and faster. This means our equation has to change to say x=1/2y. The faster we travel through space, the slower we travel through time. "What exists around x=y? What lies not on our line?" Beats me :l Link to comment Share on other sites More sharing options...
Radical Edward Posted November 24, 2002 Share Posted November 24, 2002 Originally posted by fafalone Space is everything around us, and time is ...time. Think of a graph with time on the x-axis, and space on the y axis. We exist on the line y=x how about relativity? Link to comment Share on other sites More sharing options...
fafalone Posted November 24, 2002 Share Posted November 24, 2002 What about it? Link to comment Share on other sites More sharing options...
aman Posted November 24, 2002 Share Posted November 24, 2002 Time is relative to a reference point. Since the big bang we are surrounded by reference points and even 50 billion light years away in the void, it may seem like only space but there is still time relative to us. Maybe outside x=y is warped space-time Just aman Link to comment Share on other sites More sharing options...
fafalone Posted November 24, 2002 Share Posted November 24, 2002 All space-time is warped, just by a degree effected by proximity to massive objects; if you look at gravitation equations the influence of gravity only approaches 0 as the distance approaches infinity; so it's never 0. Link to comment Share on other sites More sharing options...
*Marmite* Posted November 26, 2002 Author Share Posted November 26, 2002 All space-time is warped, just by a degree effected by proximity to massive objects the above quote gives me visuals of a black background with green square grid over it, kinda bulging and tunelling in2 a black hole (ne1 seen that 3D episode of the simpsons?) am i thinking of the right thing here? i understand what everyone has said so far but i cant visulise "space-time" has ne1 got links to a site with graphical info on it?...i always find tat much easier tnx for everything so far thou Link to comment Share on other sites More sharing options...
fafalone Posted November 26, 2002 Share Posted November 26, 2002 Assuming you have a functional visual system, you see space-time. Link to comment Share on other sites More sharing options...
*Marmite* Posted November 26, 2002 Author Share Posted November 26, 2002 oh. i see Link to comment Share on other sites More sharing options...
fafalone Posted November 26, 2002 Share Posted November 26, 2002 Space-time is the universe around us. Link to comment Share on other sites More sharing options...
NSX Posted February 13, 2003 Share Posted February 13, 2003 Originally posted by *Marmite* (ne1 seen that 3D episode of the simpsons?) am i thinking of the right thing here? hehe, I've seen that too; but that's more like a black hole kinda thing, except black holes should be much stronger. Originally posted by *Marmite* i understand what everyone has said so far but i cant visulise "space-time" Well, in math, we assign different variables to describe different things that change. In our world, we can go forward, sideways, and up. These variables make up space. Another way to show where we are is through time. ie. if there were only three dimensions, we would just be frozen. So time can be used to show where we are. Link to comment Share on other sites More sharing options...
fafalone Posted February 13, 2003 Share Posted February 13, 2003 there many more than 4 dimensions... Link to comment Share on other sites More sharing options...
JaKiri Posted February 13, 2003 Share Posted February 13, 2003 Originally posted by fafalone there many more than 4 dimensions... There are an infinite number of theoreticals, but only empirically 4. Link to comment Share on other sites More sharing options...
fafalone Posted February 13, 2003 Share Posted February 13, 2003 Isn't the theoretical number 26? Link to comment Share on other sites More sharing options...
JaKiri Posted February 13, 2003 Share Posted February 13, 2003 Originally posted by fafalone Isn't the theoretical number 26? Mathematically, there are infinite dimensions. You can't use M-Theory as an example of a physical theory, as it's nowhere near complete. Empirically there are 4. Link to comment Share on other sites More sharing options...
NSX Posted February 14, 2003 Share Posted February 14, 2003 Originally posted by MrL_JaKiri Mathematically, there are infinite dimensions. You can't use M-Theory as an example of a physical theory, as it's nowhere near complete. Empirically there are 4. M-Theory? What are the other 26 dimensions? lol But I remember reading about 9 dimensions in Temporal Mechanics; Or what about the 11 dimension string theory? Link to comment Share on other sites More sharing options...
Rich_121 Posted August 21, 2008 Share Posted August 21, 2008 Historical note: we use the phrase "space-time" because in Einstein's relativity theories, both space (3 dimensions) and time (1 dimension) get treated in an analogous way, mathematically. Therefore, it was convenient to have a phrase with which to refer to both space and time dimensions at once. Hence, Space-Time. Link to comment Share on other sites More sharing options...
north Posted August 23, 2008 Share Posted August 23, 2008 Historical note: we use the phrase "space-time" because in Einstein's relativity theories, both space (3 dimensions) and time (1 dimension) get treated in an analogous way, mathematically. Therefore, it was convenient to have a phrase with which to refer to both space and time dimensions at once. Hence, Space-Time. true but this is what is happening and this is pervasive , throughout all of physics and astronomy for this is not the first time that I have persented this argument which is ; that space has some substance asscociated with it and that time has some sort of energy associated with it both associations are entirely error simply put you can't grasp space and time , no matter how much is entered into an equation will NEVER change the situation between two or more objects EVER but what will change the situation between objects is the energy which is inherent within the objects and the energy which is from the object and projected out beyond the object its self hence a movement and therefore hence a measure of " time " that this happens because of the objects themselves nothing more nothing less Link to comment Share on other sites More sharing options...
Sirjon Posted June 8, 2009 Share Posted June 8, 2009 There are an infinite number of theoreticals, but only empirically 4. Would you believe there is a fifth dimension? That space-time could be the surface of a five-dimensional balloon? Gravity and Space-Time: Related to Each Other Link to comment Share on other sites More sharing options...
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