i've read a theory about dark stars resently and i've got some questions thats been gnawing at my mind, hope i can get some answers here. 1: what is the size of an atom? as in if the nucleus was the sun, where would the electrons be? i know diffrent substances has diffrent atom sizes but for the sake of argument lets use an atom like helium. so if the helium atomic nucleus was the sun, its electrons would be in what planetary orbit? 2: i dont know what orbit you choose but say you pick mars for instance, would gravity be able to change the orbit of the electrons by squeezing them in to a closer orbit like say venus? is it possible? got more questions but they depend heavily on the first two. so if anyone could enlighten me i would really apreciate it.