What Is A Black Hole?

Black holes may be among the strangest - and most commonly misunderstood - objects in our universe. The remnants of the most massive stars, they sit at the limit of our understanding of physics. They can contain several times the mass of our sun in a space no larger than a city.

With gravity so intense that not even light can escape their surfaces, black holes can teach us about the absolute extremes in the cosmos and the very structure of space itself.