> with similar visible sizes and structures This galaxy is very much not in the normal range of "sizes and structures", and is highly dissimilar to almost all

> with similar visible sizes and structures This galaxy is very much not in the normal range of "sizes and structures", and is highly dissimilar to almost all other galaxies observed. the stuff about changing F=ma vs changing Fg is kind of pedantic and immaterial to the topic of simulation, given that the accleration due to gravity is the only thing that is being simulated.