In quasars, we see broad optical lines, but also “thermal spectra” (energy at all wavelengths, like a rainbow), and X-ray emission features due to processes occurring near the black hole; ...

Artist's rendition of a quasar via NASA. Perhaps one of the most perplexing mysteries in current astrophysics is the science behind Quasars. Quasars, or "quasi-stellar radio sources" are the ...

Now, however, a study suggests that a quasar can get by on a lot less to eat than once thought, and can easily be produced by galaxies that have no apparent history of collisions.

These quasars are believed to have formed when the universe was half its current age. Images show the region as it was 10 billion years ago, or less than 4 billion years after the Big Bang.

The quasars are powered by black holes that are up to ten billion times the mass of the Sun. The black hole's gravity pulls in matter which forms a rotating disk around the black hole called an ...

Quasars, the brightest objects in the cosmos, could act as cosmic signposts, directing astronomers to elusive pairs of supermassive black holes. Though scientists are aware that supermassive black ...

Quasars are actually galaxies with powerful black holes at their centers, sucking in matter and spitting out gouts of x-rays that create a massive, broiling-hot cloud.

Gravitational waves stretch and squeeze the fabric of space and time itself. When space/time is squeezed, pulsar pulses ...

Quasars are some of the most luminous objects in the cosmos, and the engines that drive them literally bend time and space. Join host Abigail Bollenbach as she answers your questions on quasars.

Both quasars and blazars are intrinsically the same. Both are active galaxies, and both harbor supermassive black holes with jets. The difference between blazars and quasars comes down to the ...