Black Goo is a thick, sticky, tar-like substance with a mysterious and dubious background. It was originally introduced in ...

This artist’s illustration depicts a dwarf galaxy that hosts an active galactic nucleus — an actively feeding black hole. In the background are many other dwarf galaxies hosting active black ...

To understand the gravitational wave background, however, scientists first need to know how massive the universe’s supermassive black holes really are. Bigger cymbals, Simon said, make a bigger bang ...

In this artist’s rendering, a stream of matter trails a white dwarf orbiting within the innermost accretion disk surrounding 1ES 1927’s supermassive black hole (Aurore Simonnet/Sonoma State ...

Such supermassive black holes are mysterious. Scientists aren't sure when and how they grew so large. Greene says being able to study less massive ones, like this new one, could provide clues ...