Quasars are very bright somethings. They usually have a strong golden tint and are easy to pick out. They don’t appear to have any visible structure or individual stars.
(The following is creative speculation)
Black holes might have another reason for only being found in the cores of galaxies.
Does anyone know of a naked black hole that is not surrounded by a lot of mass? That puts that black hole and the surrounding volume of space within slower rate time.
I suggest that a Quasar is a black hole which has ruptured in faster time rate space. The matter in a black hole could be degenerate (time starved neutrons?) and to become matter as we know it, time has to be added to it. (Instant Martians just add water).
A Quasar might be a white hole, matter returning/escaping back to the universe.