I've been reading peoples posts and noticed something - People seem to refer to Star systems containing planets - and that each map has so many star systems - and judging by what was said on some of the images there are 3 star systems per galaxy

So - is that a picture of a universe, containing 3 galaxies, with 61 solar systems, containing some unknown number of planets?
Or - is it a picture of a galaxy, containing 3 solar systems, with 61 planets?
Honestly I'm getting confused here - because 61 habitable planets in a galaxy with only 3 stars in it seems unlikely.