Randolpin Posted November 19, 2016 Share Posted November 19, 2016 (edited) This question is all about what happen to space around an object provided that the object is growing thru time.Did the space around The object expands or being occupied already by the object as the object grows on or the space inside it is generated or in other words the space is formed inside the object? Answers are very much appreciated.Clarifications with regards to my questions is very much accepted.Thank You and God Bless us all!!! Edited November 19, 2016 by Randolpin Link to comment Share on other sites More sharing options...
Sriman Dutta Posted November 19, 2016 Share Posted November 19, 2016 What do you mean by an object growing through time? Link to comment Share on other sites More sharing options...
Strange Posted November 19, 2016 Share Posted November 19, 2016 Are you thinking of a tree growing or a balloon expanding? Anyway, the object expands into the space around it. Space is not "stuff" that gets pushed out of the way. It is just distance. Link to comment Share on other sites More sharing options...
Blueyedlion Posted November 22, 2016 Share Posted November 22, 2016 Are you thinking of a tree growing or a balloon expanding? Anyway, the object expands into the space around it. Space is not "stuff" that gets pushed out of the way. It is just distance. You just said the space around us is absolutely nothingness... There's no such thing as nothing, there is always something. On object cant move into nothingness. There has to be something filling up a volume of space to give it space. Link to comment Share on other sites More sharing options...
Strange Posted November 22, 2016 Share Posted November 22, 2016 You just said the space around us is absolutely nothingness... There's no such thing as nothing, there is always something. On object cant move into nothingness. There has to be something filling up a volume of space to give it space. Yes, I didn't say that. If you are asking about the content of space around an object, then that content will be displaced by the object moving into that space. (With a few exceptions such as neutrinos and X-rays, which will continue to pass through the object as if it weren't there. Link to comment Share on other sites More sharing options...
Blueyedlion Posted November 22, 2016 Share Posted November 22, 2016 (edited) Yes, I didn't say that. If you are asking about the content of space around an object, then that content will be displaced by the object moving into that space. (With a few exceptions such as neutrinos and X-rays, which will continue to pass through the object as if it weren't there. Space and content are the same thing, the content creates the space or in other words, space is both the room and stuff that moves within it. Look at any 'empty' space around you, that's a physical environment with denser properties we call objects and stuff within it. If space wasn't tangible nothing could move through it. Enough said. Edited November 22, 2016 by Blueyedlion Link to comment Share on other sites More sharing options...
Strange Posted November 22, 2016 Share Posted November 22, 2016 Space and content are the same thing, the content creates the space or in other words, space is both the room and stuff that moves within it. Look at any 'empty' space around you, that's a physical environment with denser properties we call objects and stuff within it. If space wasn't tangible nothing could move through it. Enough said. Then why doesn't the length of 1 metre vary depending on what is in it? Link to comment Share on other sites More sharing options...
Tim88 Posted November 22, 2016 Share Posted November 22, 2016 (edited) This question is all about what happen to space around an object provided that the object is growing thru time.Did the space around The object expands or being occupied already by the object as the object grows on or the space inside it is generated or in other words the space is formed inside the object? Answers are very much appreciated.Clarifications with regards to my questions is very much accepted.Thank You and God Bless us all!!! Blueyedlion gave a good answer, the object is perhaps best understood as field excitations in space. Thus no space is "pushed away", nor is space "formed inside the object". Then why doesn't the length of 1 metre vary depending on what is in it? But in fact, according to GR it does vary radially depending on what is in it. [edit:] And of course proper, or "local" length does not depend on what is in it, but locally even a 1 metre rod will be found to be compressed in a gravitational field when the length is measured optically. Edited November 22, 2016 by Tim88 1 Link to comment Share on other sites More sharing options...
swansont Posted November 22, 2016 Share Posted November 22, 2016 But in fact, according to GR it does vary radially depending on what is in it. In GR it varies according to what is in the vicinity, not what is in it. A meter will be modified differently if near an object with 100 solar masses vs 1 solar mass, but the volume containing the meter need not contain any of that mass. It can, but it's not a requirement. So I don't think the situations are equivalent. Link to comment Share on other sites More sharing options...
Strange Posted November 23, 2016 Share Posted November 23, 2016 But in fact, according to GR it does vary radially depending on what is in it. It might do. But that is missing the point. You can, in principle, have a volume with nothing in it. (The fact that it is not possible in our universe is irrelevant.) Link to comment Share on other sites More sharing options...
Tim88 Posted November 23, 2016 Share Posted November 23, 2016 In GR it varies according to what is in the vicinity, not what is in it. A meter will be modified differently if near an object with 100 solar masses vs 1 solar mass, but the volume containing the meter need not contain any of that mass. It can, but it's not a requirement. So I don't think the situations are equivalent. Yes that's right. And perhaps it's not related to what the OP had in mind anyway... let's see! (where is the OP?) Link to comment Share on other sites More sharing options...
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