View Post

Black Holes: Now Available in Medium

In Black Holes by Brian Koberlein

Observationally we know that black holes come in two sizes: stellar mass black holes with a mass of 5 – 10 Suns, and supermassive black holes with a mass of millions or billions of Suns. What we haven’t seen are medium sized black holes with masses of hundreds to thousands of Suns. We’ve long suspected they should exist, but proving it has been difficult. Now there’s strong evidence that these medium-sized black holes actually exist.

View Post

Twin Giants

In Black Holes by Brian Koberlein

A supermassive black hole lurks in the center of our galaxy. But two supermassive black holes lurk in some galaxies.