They produce way more energy than the sun and appear to break a physical boundary called the Eddington limit - now scientist found a possible explanation.
A supermassive black hole accidentally spotted by NASA's Hubble Space Telescope is now flying through space, leaving a breadcrumb path of stars behind it.
The supermassive black hole at the center of Abell 1201 BCG was found using gravitational lensing. It's so big that it might be part of a new category: Ultramassive black holes.
The telescope was not able to capture the whole process up close because the star that was swallowed was 300 million light years away.
The two black holes are extraordinarily close together, and are jointly feasting on the matter generated as a byproduct of the merging galaxies.
Scientists have detected cosmic "bursts" which indicate the occurrence of a celestial event where stars collided, merged and collapsed into a black hole.
Signals found in gamma-ray bursts could create a potential opportunity to study the properties of similar occurrences, according to a new study.
Here's what you need to know about black holes and whether it could allow someone to travel through time.