Sgr A*, at the heart of the Milky Way and clocking in at 4.3 million solar masses, is the closest supermassive black hole we have access to. It's also on the quiescent end of the activity scale, which ...

A fluffy cluster of stars spilling across the sky may have a secret hidden in its heart: a swarm of over 100 stellar-mass black holes. The star cluster in question is called Palomar 5. It's a ...

MIT astronomers have been captivated by the strange behaviors of a supermassive black located 270 million light-years away, ...

Astronomers have captured the most detailed infrared images yet of an active galactic nucleus (AGN), using the Large ...

Astronomers have discovered an extraordinary new giant radio galaxy with plasma jets 32 times the size of our Milky Way.

A fluffy cluster of stars spilling across the sky may have a secret hidden in its heart: a swarm of over 100 stellar-mass black holes. The star cluster in question is called Palomar 5. It's a stellar ...

The galaxy is located about 270 million light-years from Earth. The mass of the black hole in the new observations, called 1ES 1927+654, is about a million times greater than the mass of our sun.

The jets extending from these blazars can extend millions of light-years in length. Black holes are among the most mysterious cosmic objects, much studied but not fully understood. In pursuit of ...

Astronomers don't know why these stellar clusters formed enormous black holes so readily, nor why this phenomenon petered out 1.5 billion years after the Big Bang. These objects are also dim in X ...