Some massive black holes spend billions of years far from the centers of their galaxies. A new study says that these ...

The researchers discovered the Treble Clef is likely caused by an outburst from a supermassive black hole, followed by a ...

A collision may have left these galaxies without dark matter. That spells trouble for alternative gravity theories.

Introduction]'A yellow ball of light floating in the dark void of space, surrounded by a perfect circle of a vivid blue ring' ...

A team of astronomers may have detected the gamma-ray signature produced when antimatter particles, or positrons, collide ...

Chandra and eROSITA show the Treble Clef radio source sits in two merging galaxy clusters behind the Milky Way, a likely ...

Astronomers using the Chandra X-ray Observatory have uncovered a likely explanation for the "Treble Clef." The radio-wave ...