A Brief History of Time: From the Big Bang to Black HolesBantam Books, 1990 - 198 páginas "Stephen W. Hawking has achieved international prominence as one of the great minds of the twentieth century. Now, for the first time, he has written a popular work exploring the outer limits of our knowledge of astrophysics and the nature of time and the universe. The result is a truly enlightening book: a classic introduction to today's most important scientific ideas about the cosmos, and a unique opportunity to experience the intellect of one of the most imaginative, influential thinkers of our age. From the vantage point of the wheelchair where he has spent the last twenty years trapped by Lou Gehrig's disease, Professor Hawking himself has transformed our view of the universe. His groundbreaking research into black holes offers clues to that elusive moment when the universe was born. Now, in the incisive style which is his trademark, Professor Hawking shows us how mankind's "world picture evolved from the time of Aristotle through the 1915 breakthrough of Albert Einstein, to the exciting ideas of today's prominent young physicists. Was there a beginning of time? Will there be an end? Is the universe infinite? Or does it have boundaries? With these fundamental questions in mind, Hawking reviews the great theories of the cosmos - and all the puzzles, paradoxes and contradictions still unresolved. With great care he explains Galileo's and Newton's discoveries. Next he takes us step-by-step through Einstein's general theory of relativity (which concerns the extraordinarily vast) and then moves on to the other great theory of our century, quantum mechanics (which concerns the extraordinarily tiny). And last, he explores the worldwide effort to combine the two into a single quantum theory of gravity, the unified theory, which should resolve all the mysteries left unsolved - and he tells why he believes that momentous discovery is not far off. Professor Hawking also travels into the exotic realms of deep space, distant galaxies, black holes, quarks, GUTs, particles with "flavors" and "spin," antimatter, the "arrows of time" - and intrigues us with their unexpected implications. He reveals the unsettling possibilities of time running backward when an expanding universe collapses, a universe with as many as eleven dimensions, a theory of a "no boundary" universe that may replace the big bang theory and a God who may be increasingly fenced in by new discoveries - who may be the prime mover in the creation of it all. A BRIEF HISTORY OF TIME is a landmark book written for those of us who prefer words to equations. Told by an extraordinary contributor to the ideas of humankind, this is the story of the ultimate quest for knowledge, the ongoing search for the secrets at the heart of time and space." -- |
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Página 83
... limit to the repulsion that the exclusion principle can provide . The theory of relativity limits the maximum difference in the velocities of the matter particles in the star to the speed of light BLACK HOLES 83.
... limit to the repulsion that the exclusion principle can provide . The theory of relativity limits the maximum difference in the velocities of the matter particles in the star to the speed of light BLACK HOLES 83.
Página 84
... limit , on the other hand , have a big problem when they come to the end of their fuel . In some cases they may explode or manage to throw off enough matter to reduce their mass below the limit and so avoid cata- strophic gravitational ...
... limit , on the other hand , have a big problem when they come to the end of their fuel . In some cases they may explode or manage to throw off enough matter to reduce their mass below the limit and so avoid cata- strophic gravitational ...
Página 167
... limit to this sequence of " boxes within boxes . " If one had a particle with an energy above what is called the Planck energy , ten million million million GeV ( 1 followed by nineteen zeros ) , its mass would be so concentrated that ...
... limit to this sequence of " boxes within boxes . " If one had a particle with an energy above what is called the Planck energy , ten million million million GeV ( 1 followed by nineteen zeros ) , its mass would be so concentrated that ...
Otras ediciones - Ver todas
A Brief History of Time: From the Big Bang to Black Holes Stephen Hawking,Carl Sagan Vista de fragmentos - 1988 |
Términos y frases comunes
able according appear arrow atoms attraction beginning believed big bang black hole body boundary called caused collapse complete contracting density describe developed dimensions direction disorder distance early earth effect Einstein electrons emitted energy event event horizon example exist expanding explain fact fall field FIGURE force galaxies gravitational collapse gravity happen histories idea increase infinite initial known later laws less light limit look mass matter means measure million million million moving neutron Newton objects observe orbits particles past paths phase planets position possible predictions principle probably quantum mechanics quarks question radiation rays reason regions relativity result rotating seems showed single singularity space space-time speed stars started string suggested surface temperature theory thought uncertainty unified theory universe waves weak zero