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We always treat gravity as attracting things to the *center* (of gravity) of a planet or star, for instance let's consider one called Plar.
But if you were *inside* Plar, it would be different. At the center, you would be pulled out in every direction right?
Yes but I'm still trying to see the mechanical properties of the particles interacting inside the balloon.And I'm not too happy with my last explanation either Why would the particles closest to the walls have a larger momentum than the ones, say in the middle? When you blow a balloon up you heat that air, and impart 'energy'. But after a while that energy/heat must disappear. What you then have is a larger amount of particles inside the balloon than outside, all of them in motion. They are closer to each other than on the outside, but should now have the approximate same energy/motion per particle. How do they then keep the balloon inflated?Collisions?=Alternative, how do they keep a larger 'energy' per particle after the heat has dissipated?
I'm thinking of it this way. The rest mass of a particle is defined to be the same, everywhere. At a black hole or on earth, is there something governing a minimal 'rest space' for particles too? And if it is, how do you get to be 'at rest' with such a space? If pressure is what makes the balloon burst, and it is what we define it as, right? Could you track that to a 'rest space'? Maybe you need some more degrees of freedom for it to make sense though, that we don't notice? The momentum(s) inside that balloon hasn't changed, neither has their energies/rest mass. Can there be a 'rest space'?
You would not be pulled apart by the gravity pulling your arms and legs in opposite directions - the gravity in opposite directions cancels out at the center
I'm seeing notes that the center of gravity of the Earth is about 4600 km from the middle... And, since the Earth is spinning, it would be essentially be moving around all the time.
The direction is inwards everywhere
Yep. that's the way I think of it too Clifford, as every rest mass interacting with every rest mass gravitationally.Do you mean that you can't equate a gravity with a pressure Graham? You're probably right if so. What I was thinking was that if gravity could be seen as a 'pressure', then it should have to be a fluid, it should behave as fluids. But, as usual, I'm not sure And a quite nice and understandable explanation of the mathematics behind Phractality, but, why does pressure exist? Can there be a 'ground state' for pressure? 
Gravity 'bends' all space, somehow. But, how does it do it? How can it 'bend' what is 'not there'? A fluid in dynamical (relative) motion/change? I know, it do sound as me discussing some sort of aether, but I'm only looking at it, trying to compare it to pressure. Because pressure is seriously weird to me, although I don't really know why I'm thinking of it
And then we have those particles bursting the balloon due to 'pressure' differences. Without particles of rest mass inside there would be no pressure. But then we have massless photons, that both have a momentum and, according to Lightarrow, can beget a rest mass (mathematically and theoretically) following certain constrictions. Although that one is hard to proof practically, as far as I know?But a photon, does it have a pressure? It do have a momentum?
So we can in a way define a momentum as a pressure.