5/13/2023 0 Comments A brief history of time review![]() ![]() ![]() Its boundary is called the event horizon."Īnything or anyone who fell past the event horizon, Professor Hawking explained, would soon reach a point of "infinite density and the end of time" - bad news for hypothetical astronauts. "This region is what we now call a black hole. ![]() So one has a set of events, a region of space-time, from which it is not possible to escape to reach a distant observer. Thus if light cannot escape, neither can anything else everything is dragged back by the gravitational field. "According to the theory of relativity, nothing can travel faster than light. He showed that they must contain "a singularity of infinite density and space-time curvature", and he showed that they aren't completely black - theoretically, they can emit tiny amounts of radiation.īut in A Brief History Of Time, he took it back to the basics, giving this neat explanation for the phenomenon: This was Professor Hawking's area of expertise. If you read it, you'll have an idea of what black holes are all about If you're one of those 97 people, you'll be glad to know an even more concise version of A Brief History of Time was released in 2005: A Briefer History of Time. He was basing that approximation on a formula called the Fully Read Index, which measures how easy a book is to read and how dumb the author makes readers feel. "Of every 100 people who bought A Brief History of Time, three finished it," wrote Time's book critic Paul Gray in 2001. ![]()
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