Intersting idea, but I'm not sure that explains anything gravity doesn't. Many things in physics can be expressed equally as either a positive force or a negative opposing force. I think I've actually heard this concept of gravity before. Mathematically, I think the two concepts are identical.
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Originally Posted by Gargoyle_Steve
Therefore if we build a solid box, such that it's interior cavity is enclosed in every direction by pressure blocking mass, and place a marble in it, as the pressure has been uniformly blocked in every direction there should be no pressure remaining at all inside, and the marble should be free to float around regardless of any other external pushing or attractive forces.
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That's pretty much exactly what the 'standard' theory of gravity says too.
If you built a heat resistant hollow sphere and put it at the center of the earth, you could float around inside it and feel 'weightless'. Provided that you didn't get too far away from the center point, since then you wouldn't be in equilibrium. Under standard theory, you would hover there because you'd be pulled by the rest of the mass of the earth equally. Under xelasnave's theory, you would float there because the pressure pushing on you would be equally balanced as well. You can't block ALL the pressure pushing on you (black hole?) since then all the electrons and atoms in your body would fly apart.
One thing though that this brings up is something that scientists are still arguing about and is one of my favorite theoretical subjects.
Xelasnave's theory advocates that the 'speed' of gravity is infinite and felt everywhere at once. This is basically the Newtonian Physics view of things. Einstein physics says that gravity propogates at the speed of light. In the newtonian view, if the sun disappeared now, the earth would immediately go flying off into space, even though the sun would appear to stay in the sky. The Einstein view says that we'd happily move along for another 8 minutes or so until we SAW the sun disappear and THEN go flying.
Conceptually, accepting the Newtonian way makes more sense... but many tests and LOTS of math seem to indicate that Einstein's explaination is what actually happens. (IE: frame dragging, etc) People are still arguing about it, and basically there's a lot of math in general relativity that attempts to reconcile this effect... I think a lot of mathematicians don't like it because it seems too complex, but nobody has been able to disprove it yet. There IS an explaination that fits the 'gravity obeys the speed of light' thing... but I'm not smart enough to understand the equations.
-TK