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Originally Posted by subversion what's the difference (according to gravity)? |
Gravity bends spacetime due to mass, not due to matter. There is a concept that we call density, maybe you've heard about it. If you ahve, you will know that there can be a lot of matter but little mass, and vice versa. And if they are not equal in quantity they can't be the same thing! (and being equal in quantity is only the start requisite for being the same thing)