But in the past two decades, new types of black holes have been seen and astronomers are beginning to understand how they ...

The image of supermassive black hole Sagittarius A * was created using data from the Event Horizon Telescope Collaboration.

Scientists are using pulsars to detect the gravitational wave 'hum' created from supermassive black hole mergers. Credit: National Science Foundation (NSF) ...

Quasar 0957+561, the first known gravitationally lensed quasar, lies near NGC 3079 in Ursa Major. Here's how to find and ...