Hank explains how quasars and blazars are both the same thing - just oriented differently in respect to us - and how that impacts the way we perceive them and how it also effects the ways we can study them.

Last week scientists announced that they’ve likely identified the very first astrophysical source of high-energy neutrinos.

Quasars, or extremely active black holes are the brightest objects in the universe. But aren't black holes meant to be invisible? Based on the Illustris Project simulation, we also look at radio-mode and quasar-mode feedback, seemingly...

Most large galaxies contain a giant central black hole. In an active galaxy, matter falling toward the supermassive black hole powers high-energy emissions so intense that two classes of active galaxies, quasars and blazars, rank as...

Active galaxies called blazars make up the largest class of objects detected by Fermi's Large Area Telescope (LAT). Massive black holes in the hearts of these galaxies fire particle jets in our direction. Fermi team member Elizabeth...