To Earthlings gazing into space, our solar system appears to be surrounded by billions of stars in the Milky Way. But if we look even further out, would it be possible to find evidence that we were in ...

Astronomers suspect that in the first second after the universe formed, the very first black holes also formed. These tiny though profoundly dense objects — think of an atom-sized particle wielding ...

An illustration of a type of black hole called a blazar. A blazar is a black hole with a jet of energy that happens to be (harmlessly) aimed at Earth. Credit: M. Weiss / CFA We know, the headlines can ...