NASA’s Hubble Space Telescope has unveiled a strikingly detailed view of one of the universe’s most iconic and powerful ...

Daedalus, Vol. 143, No. 4, From Atoms to the Stars (Fall 2014), pp. 103-113 (11 pages) Quasars emit more energy than any other object in the universe, yet are not much bigger than our solar system.

"Three quarters of these sources are quasars and galaxies with active nuclei (these are supermassive black holes with masses of 10 to 100 million solar masses). The remaining 250,000 sources include ...