Quasars

Quasars (quasistellar radio sources) were identified as compact yet highly radio-active celestial radio sources, listed in the Third Cambridge Catalog of Radio Stars. They were theorized to be galaxies with active centers billions of light years away.
 Martin Ryle and others England 1963 Quasars

Quasars (quasistellar radio sources) were identified as compact yet highly radio-active celestial radio sources, listed in the Third Cambridge Catalog of Radio Stars. They were theorized to be galaxies with active centers billions of light years away.