Greetings ! Some less popular theories, at this time, suggest that planets formed or at least began to form before the Sun had formed. I'm not sure that I agree with that, but it's worth remembering as another counter example to the idea I just thought about. Anyway, the idea I just thought about is: Suppose that the planets formed after the Sun(Sol) was formed. Now, is it possible that the gravitational pull of the Sun on the one hand and the pressure of the solar wind and aspecialy solar radiation on the other hand could've created certain La'grange points for various types of ellements and molecules in the early solar nebula that could've somehow affected planetary formation ? Or, were such points too far away for the powerful emmissions of the early Sun which is also why all the free matter got blown away into our Oort cloud ? All opinions are welcome. Live long and prosper.