Is dark matter made of axions? Black holes may reveal the answer

What is dark matter made of? It's one of the most perplexing questions of modern astronomy. We know that dark matter is out there, since we can see its obvious gravitational influence on everything from galaxies to the evolution ...

Supermassive black hole

A supermassive black hole is a black hole with a mass of the order of between 105 and 1010 solar masses. Most, if not all, galaxies, including the Milky Way, are believed to contain supermassive black holes at their centers.

Supermassive black holes have properties which distinguish them from their relatively low-mass cousins:

This text uses material from Wikipedia, licensed under CC BY-SA