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Originally Posted by HydrogenBond
Space has distance and time components; this is what curves. Since gravity is connected to the attraction between matter than if space didn't have substance than it would imply that gravity can bend distance and time without mass.
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Thats not true. According to general relativity, mass curves the space around it. The idea of curvature is then connected to mass, but it does not require space to have any "substance" in the way you mean.
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Space having some mass makes more sense. Space mass probally comes as a biproduct of fusion, which is why space contraction occurs where matter is highly pressurized. Space is gaining substance which diffuses to uniformly fill space. This makes the final universe state one of contraction.
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Space mass coming as a biproduct of fusion doesn't make any sense. The sun would then be gaining mass. Also, the expansion of the universe would be decelerating, not accelerating as observed. Not to mention that the most accurate theory of gravity we thus far have (general relativity) predicts that, if nonzero, the curvature of empty space creates a sort of anti-gravitational effect.
-Will
