Black holes are extreme gravitational phenomena from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
Black holes are extreme gravitational phenomena. The concept of a black hole is not easy to grasp, partly because we cannot see them directly. After all, by definition, a black hole is black. It does not emit any light. So how do we know they exist? The key to understanding black holes lies in the incredible strength of their gravitational pull. This pull is so intense that nothing, not even light, can escape its grasp. The gravitational force of a black hole is so powerful that it warps the fabric of spacetime itself. The boundary beyond which nothing can escape is called the event horizon. Once an object crosses this boundary, it is inevitably drawn into the black hole. This is why black holes are often described as cosmic vacuum cleaners. They swallow everything in their vicinity, leaving nothing behind. The size of a black hole is deter...
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