How are galaxies and solar systems similar?
Is it possible that galaxies are nothing more than supermassive proto-planetery discs (with the “bulge” at the center being the beginning of a “sun”)? If this might be the case, and it is theorized that we have a black hole at the center of our galaxy, can it also be the case that we have a mini black hole at the center of our sun? As you mention, there are similarities between spiral galaxies and protoplanetary disks, namely their disk-like appearance. The physical process behind the disk formation is the same in both cases: both the matter that collapses to form a galaxy and that which collapses to form a star or planet must conserve angular momentum. In doing so, disks are formed. In fact, the formation of disks is a ubiquitous feature of astronomical objects: rings around a planet, accretion disks around black holes, protoplanetary disks and spiral galaxy disks are all examples of angular momentum in action. Unfortunately, this similarity does not imply that there is a mini-black h
