Indeed. More detail here. https://news.ycombinator.com/item?id=29915004 https://news.ycombinator.com/item?id=29915004 Perhaps the "dark matter" of a galaxy is

Indeed. More detail here. https://news.ycombinator.com/item?id=29915004 https://news.ycombinator.com/item?id=29915004 Perhaps the "dark matter" of a galaxy is the rest of the galaxies of the universe.