Galaxies are normally made up of stars, dust, gases, and black matter to hold the galaxy together
Galaxy without black matter discovered

Researchers have found a galaxy that does not contain black matter. This observation comes as a total surprise, as it was believed until now that black matter forms sort of a scaffold that glues galaxies together. It is invisible, and therefore measured indirectly as a function of movement of the stars within a galaxy. The absence of black matter in a galaxy challenges current theories about how galaxies work.

Read the full story: NASA