Quasars
Quasars are extremely luminous and are known for being the brightest objects in space because they even eclipse the galaxies they inhabit. They are powered by black holes billions of times the mass of our sun. They only live in galaxies with super massive black holes. One fact that makes the quasar stand out is the fact that they emit radio waves. Although we are not sure how they form, we can figure out a lot about the early history of our galaxy through them because astronomers say that quasars formed at the beginning of the universe.
Quasar PG 0052+251 and its Galaxy