My latest thoughts:
They're *all* amalgamations of 'isotropic saturated matter'. The galactic centre, the stars and the planet exotic matter cores. It's isotropic, but not as we know it. It radiates attractive force carrying particles equally in all directions from it's surface, but is dependent on size of surface areas to determine force of interaction between two exotic matter bodies. Note that the underlying Archmides screw analogy still applies, so matter is really anisotropic, which is seen at the quantum level.
The moon was created from the collision of another early planet with the earth. This left the incoming planet as a moon after the impact event, which tilted both bodies by 90 degrees so that each kept the other in this on-end configuration. The earth's and the moon's exotic matter cores shaped like central bulging disks were tipped onto their ends. The orbit of the two then changed the shape of the conglomerate cores and moulded them into rugby ball shapes. When the moon is on the earth's equator the surface area 'seen' by both is at a maximum and so gives the extra 20% tidal kick. I've done a quick sketch for illustration purposes. See attached.
The rate of exotic matter comet impacts is likely to be much higher in the past due to remnants from the 'big bang' implosion event. When all this debris is consumed by stars then only supernovae remnants are a source of incoming exotic comets.
The Late Heavy Bombardment is a clue to this new way of thinking imo.Attachment #1: Exotic_Cores.jpg