TIL Ultra Faint Dwarf Galaxies (UFDGs) are a thing! 🌌
These galaxies are composed almost entirely of dark matter: 99-99.9% of their mass is dark, only 0.1 -1% is made up of stars"
Because UFDGs are so small and faint, even ones in the Milky Way's vicinity are difficult to detect. #space #verarubin
