Astronomers watched as a galaxy with the forgettable name SDSS1335+0728 suddenly sprang to life when its massive black hole ...

Using combined observations from ground-based telescopes over nearly four years, the researchers saw the distant galactic neighbors charging toward each other at more than 1.1 million miles per hour.

Astronomers witnessed two galaxies engaged in an intense deep-space battle for the first time. Watch the “cosmic joust” in ...

A galactic collision 11 billion light-years away reveals how an actively feeding supermassive black hole disrupts star ...

This black hole merger animation was created using data collected by the LIGO and Virgo gravitational wave detectors, an observation designated GW190412. Credits: © N. Fischer, H. Pfeiffer, A.