and as I already said, yes, very dense, to the point he has to wear a machine to keep his gravitational pull under control otherwise he wouldn't be able to even get near planets with them just crumbling and covering him (same thing for his weight). speaking of weight all of the bones that aren't visible are pretty much fine dust by now there's no way they could survive the pressurew so separating from host (which is literally just sans) would lead to instant death