"The black holes of nature are the most perfect macroscopic objects there are in the universe: the only elements in their construction are our concepts of space and time." — Subrahmanyan Chandrasekhar There is something deeply unsettling about a black hole. Not because it is massive, or distant, or invisible. But because it represents the point where our understanding of physics simply stops working. The equations that describe everything else in the universe — gravity, light, time — co...