- #1
Marcshall
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Hi!
A google search for my upcomming question lead me to this page, and I am delighted to find an online community of psysics who hopefully will answer my, maybe, very simpel question. In the study of Einstein's General Relativity theory, the picture of a sphere placed in a net representing spacetime is shown again and again (do a http://www.google.dk/images?q=curva...source=og&sa=N&hl=da&tab=wi&biw=1920&bih=965" of the titel of this post and you will see what I mean). While I do get the idea and think I've come to term and understand how this works and function, I just can't understand why the sphere's "bottom" is being pictured as the gravitational agent. Somehow my logic tells me that what should be "pulling down" the net should be the center of gravity inside the sphere, so that when picturing the curvature, the spacetime should penetrate the spheres. This actually also gives an illustration of how mutual gravity would work between two identical bodies, who would circle a gravital center in between the two.
Am I the one being far off or are the illustration just that, illustrations made to give an idea of the concept?
Thanks in advance and sorry for the possible inconvience of English not being my native language.
/Marc
A google search for my upcomming question lead me to this page, and I am delighted to find an online community of psysics who hopefully will answer my, maybe, very simpel question. In the study of Einstein's General Relativity theory, the picture of a sphere placed in a net representing spacetime is shown again and again (do a http://www.google.dk/images?q=curva...source=og&sa=N&hl=da&tab=wi&biw=1920&bih=965" of the titel of this post and you will see what I mean). While I do get the idea and think I've come to term and understand how this works and function, I just can't understand why the sphere's "bottom" is being pictured as the gravitational agent. Somehow my logic tells me that what should be "pulling down" the net should be the center of gravity inside the sphere, so that when picturing the curvature, the spacetime should penetrate the spheres. This actually also gives an illustration of how mutual gravity would work between two identical bodies, who would circle a gravital center in between the two.
Am I the one being far off or are the illustration just that, illustrations made to give an idea of the concept?
Thanks in advance and sorry for the possible inconvience of English not being my native language.
/Marc
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