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

Intense radiation emitted by active supermassive black holes—thought to reside at the center of most, if not all, galaxies—can slow star growth not just in their host galaxy, but also in galaxies ...

An unusual tidal disruption event spotted by astronomers may be the result of an elusive intermediate mass black hole ripping apart a star.

For every galaxy that's visible from Earth, there are nine smaller ones that we can't see, even with all the technology we've ...

Beneath a stream of radio noise gathered over the course of a long night of observation, the signal came in quietly.