This question on Worldbuilding.SE got me thinking...
We currently think that many bodies that condensed during star/planet system formation, many bodies are ejected. I've heard it stated that there are more rogue planemos than planets.
Meanwhile, stars form in dense birth clusters. The medium has been enriched by dust from previous generations of stars. So, in general, shouldn't there be larger bodies enriching this medium as well, including as many pre-formed planets as stars being formed (average one per system) and a handful of planetary embryos?
Wouldn't these affect the dynamics of the subsequent formation? Given the current tale of how the condensation of larger objects interact with the disk, having some present initially would mean something, it would seem.
And if a pre-existing large body or brown dwarf is collected into the disk, wouldn't that affect the formation of the new system in drastic ways? And, given the number of systems studied now, wouldn't this be noticed as being a not-unreasonable part of a system's history?
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