Active galactic nuclei are supermassive black holes at the center of certain galaxies. As matter falls into these black holes ...

A black hole infamous for strange features has once again baffled astronomers, this time with rapid X-ray flashes. What could ...

The first black hole that astronomers observed "turning off" just turned back on, releasing jets of hot gas into the cosmos.

The dense stellar remnant would, if confirmed, be the closest known object to any black hole, according to preliminary ...

One supermassive black hole has kept astronomers glued to their scopes for the last several years. First came a surprise ...

The newly discovered "blazar," which has a mass equal to 700 million suns, is the oldest of its kind ever seen and changes ...

"For such a faint and unknown target, we were not sure if we would get any data at all — but the strategy worked." ...

"Finding more supermassive black holes that are potentially hosting jets raises the question as to how these black holes grew ...

In 2018, a galaxy about 270 million light-years away from Earth exhibited a major increase in activity. It quieted down again ...

Researchers found far more hidden black holes than previously known, indicating plenty of behemoths lurking in thick clouds ...

Since 2018, we've seen 1ES 1927+654 generate jets in real time and found it may have a lone white dwarf orbiting near the ...