A 4-dimensional spacetime is also described, in which 'space' and 'time' are intrinsically linked. "Events" can also be described by using light cones, a spacetime graphical representation that restricts what events are allowed and what are not based on the past and the future light cones. A new way of defining a metre using speed of light was developed. The author himself notes in the book's acknowledgements that he was warned that for every equation in the book, the readership would be halved, hence it includes only a single equation: E = m c 2, which explains that an infinite amount of energy is needed for any object with mass to travel at the speed of light(3×10⁸m/s). With some difficulty, he persuaded Hawking to drop all but one equation. Mitton was doubtful about all the equations in the draft manuscript, which he felt would put off the buyers in airport bookshops that Hawking wished to reach. Publication Įarly in 1983, Hawking first approached Simon Mitton, the editor in charge of astronomy books at Cambridge University Press, with his ideas for a popular book on cosmology.
The book became a bestseller and sold more than 25 million copies. Finally, he talks about the search for a unifying theory that describes everything in the Universe in a coherent manner. He discusses two major theories, general relativity and quantum mechanics, that modern scientists use to describe the Universe. He writes about cosmological phenomena such as the Big Bang and black holes. He talks about basic concepts like space and time, basic building blocks that make up the Universe (such as quarks) and the fundamental forces that govern it (such as gravity). In A Brief History of Time, Hawking writes in non-technical terms about the structure, origin, development and eventual fate of the Universe, which is the object of study of astronomy and modern physics. Hawking wrote the book for readers who had no prior knowledge of physics. Black Holes and Baby Universes and Other EssaysĪ Brief History of Time: From the Big Bang to Black Holes is a book on theoretical cosmology by English physicist Stephen Hawking.
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