Under the right circumstances, dust and gas falling into these galactic cores can form a disk of hot material around the ...

This is the gargantuan black hole that lives at the centre of our galaxy, pictured for the very first time. Known as Sagittarius A*, the object is a staggering four million times the mass of our Sun.

are confined to vertebrate and arthropod species that have well-developed color vision. Black holes have basically three characteristics: mass, spin and charge. So distinguishing them from one ...

Hubble probes Quasar tsunamis rip across galaxies: This is an artist's concept of a distant galaxy with an active quasar at ...

Quasars — blazingly bright galactic cores — owe their brilliance to the intense heat that results as gas whirls around a big black hole. The black hole powering a quasar 13 billion light-years ...