I'm reading Hawking's take on ground state energies never being zero, and he adds an interesting point. He said based on the casimir effect the denisty of ground state fluxuations (wavelengths) are less by a finite amount between the plates, causeing them to draw together. To me this explains everything about gravity in a nutshell to borrow the metaphor. I have two contaversial but provocative idea to throw out there. Please pick them apart or elaborate further. It would explain Dark energy: as the density, or pressure of the vacuum (mostly, but also within the finite spaces between particles) that causes the force we know as gravity as a secondary effect. Example-we are held in a 'gravity well' on Earth caused by outward pressure upon the mass of two objects (you and Earth) And It would explain Dark Matter: the other side of the dark 'coin' where an attractive force spread uniformly throughout the universe with minute and finite gravitational effects is produced by the ground state fluxuations, also known as ZPE. They can both be explained as flip sides of the same cause, causing the force of gravity through quantumn zero-point energies, and providing the missing mass by its consistancy throughout the universe. OK, your turn guys.