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In GR gravity is modeled well by the curving of space-time, as shown in pictures like these: http://en.wikipedia.org/wiki/Image:Spacetime_curvature.png
I've always liked GR but i don't understand why space is being bent. In the picture above, which i don't take literally as it is only a model, it looks as if the curvature of space responsible for gravity is itself caused by something like gravity, something that causes matter to bend space in always the same direction. I researched online and even thought of some models to explain this like http://www.bloo.us/branegrav.gif" but wasn't completely satisfied. I need some insight.
I've always liked GR but i don't understand why space is being bent. In the picture above, which i don't take literally as it is only a model, it looks as if the curvature of space responsible for gravity is itself caused by something like gravity, something that causes matter to bend space in always the same direction. I researched online and even thought of some models to explain this like http://www.bloo.us/branegrav.gif" but wasn't completely satisfied. I need some insight.
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