Not being an astrophysists I may be entirely off base but I have what I think is a novel description of the formation of the solar system. It come from an observation that the solar system share certain similarities with an impact crater. The lack of mass in the center and what is there is quite dence, surrounded by a ring of higher mass, then the outer area containing much greater mass of much lower density.

This bring to my mind that it is likely that the Sun was born violently. It also implies that the planets formed before the Sun was birthed. The planets in the beginning were all Jovian in nature, largely hydrogen with a small amount of other atoms. The heavier atoms would have tended to sink to the core of each planetary body. At some point the core of the Sun would reach a critical density and a fusion chain reaction began. The hydogen isotopes would be unusually rich in this presolar mass and for this reason the reaction would be especially violent. A shock wave would probigate from that point fueling itself by causing the hydrogen it encountered to fuse. At some point the shock wave would reach a point that it it was accellerating the matter it encountered to excape volcity and that would then define the mass of the Sun. As the shock wave encountered planetary masses it would strip away the hydrogen atmospheres of the planets and shatter the core of the smaller masses. All but the largest masses would be carried away in the wave. Eventually the wave would begin to disipate, it would reach a point where it would drop all the denser masses in about the same area. After this point the wave would not have the abillity to strip planets of a majority of their atmospheres. I have more ideas to fill out this hypothosis but I think this is enough for one post. I look forward to comments on this idea.