While red dwarfs are the most common type of star in the Milky Way galaxy, they often do not show up in astronomical surveys because they are too dim in visible light.
" He adds a bit later: "That we live in a large spiral galaxy with very little central stellar bulge and a modest central black hole may be a clue to the type of galaxies best suited to life: ones that did not spend their pasts building colossal black holes and fighting the demons unleashed in the process.