(galaxy) An extragalactic object, starlike in appearance, that is among the most luminous and thought to be the most distant objects in the universe.
Esimerkit
So far, the clumsily long name “quasi-stellar radio sources” is used to describe these objects. Because the nature of these objects is entirely unknown, it is hard to prepare a short, appropriate nomenclature for them so that their essential properties are obvious from their name. For convenience, the abbreviated form “quasar” will be used throughout this paper.