Comment I don't understand how this is surprising (Score 3, Interesting) 9
Wouldn't this be a normal stage on the process of condensation from "cloud of particulates" into a solar system? If this cloud is spinning and will ultimately segregate into distinct planets, presumably at some point in that process those protoplanetary bodies are reasonably discrete but not yet condensed. What am I missing?
Fwiw Jupiter is the largest a body can be before it becomes a brown dwarf; that is, adding mass doesn't increase the diameter any longer it just increases in density due to electron degeneracy.