A 2D surface can be curved like: http://ej.iop.org/images/1367-2630/1...282983fig8.jpg
That explains how particles can get curved paths due to gravity. However, it doesn't explain how particles can be pulled towards the center of the gravity.
How should the 2D surface be curved to match the force of gravity?
To illustrate the problem in 3D, think of a sheet of rubber and a bowling ball is placed on it to curve the surface. Now take a rigid plastic replica of that curvature and move it into gravity-free space. That curvature itself will now fail to represent gravity. The bowling ball analogy that is often used itself requires the presence of gravity to explain gravity. Isn't that like a circular argument?
That explains how particles can get curved paths due to gravity. However, it doesn't explain how particles can be pulled towards the center of the gravity.
How should the 2D surface be curved to match the force of gravity?
To illustrate the problem in 3D, think of a sheet of rubber and a bowling ball is placed on it to curve the surface. Now take a rigid plastic replica of that curvature and move it into gravity-free space. That curvature itself will now fail to represent gravity. The bowling ball analogy that is often used itself requires the presence of gravity to explain gravity. Isn't that like a circular argument?
via JREF Forum http://forums.randi.org/showthread.php?t=269172&goto=newpost
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