One very important constraint for testing theories of Solar System formation is meteorite chemistry. (sciencedaily.com)
Consequently, the satellites that formed earlier when the rings were more massive are larger and located farther out, whereas multiple small satellites tend to form just outside of the main rings at the final stage of the satellite system formation. (kobe-u.ac.jp)
Several computer simulations of stellar and planetary system formation have suggested that some objects of planetary mass would be ejected into interstellar space. (newworldencyclopedia.org)