any of a number of starlike celestial objects that emit immense amounts of light and, often, radio waves, characterized by having spectral lines with very large redshifts: quasars are thought to be the most distant and oldest observable objects in the universe
Origin of quasar; from quas(i-stell)ar (radio source): so named (1964) by H.-Y. Chiu, Chin-Am physicist
A compact, extremely bright celestial object whose power output can be hundreds to several thousand times that of the entire Milky Way galaxy. Quasars are among the most distant objects in the universe and are generally considered to be a form of active galactic nucleus.
Origin of quasarFrom earlier quas(i-stell)ar (radio source).