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292 pages, Paperback
First published September 23, 2014
"When a star about two or three times the size of our sun dies, it collapses until the entire mass of the star is concentrated at one point -- a singularity -- a black hole. As it's collapsing, it becomes denser and its gravitational attraction increases until nothing can escape its surface. In the case of the Earth, the escape velocity is seventeen-thousand miles an hour. But when the gravitational attraction is billions of times greater, the escape velocity exceeds the speed of light. Nothing can travel faster than light, so nothing can escape the surface of such an object. When the collapsing star reaches that size where its gravitational attraction is so great that nothing, not even light can escape, it's reached its Schwarzschild Radius."