It can in fact never reach the speed of light, because by then its mass would have become infinite, and by the equivalence of mass and energy, it would have taken an infinite amount of energy to get it there. ... at 10 percent of the speed of light an object's mass is only 0.5 percent more than normal, while at 90 percent of the speed of light it would be more than twice its normal mass.

Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist.



However, if it was expanding at more than a certain critical rate, gravity would never be strong enough to stop it, and the universe would continue to expand forever. The universe would be completely self-contained and not affected by anything outside itself. The effect of the energy loss will be to change the orbit of the earth so that gradually it gets nearer and nearer to the sun, eventually collides with it, and settles down to a stationary state. Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist. Our Picture of the Universe 128 History Time Never Fall Glory If you are neutral in situations of injustice, you have chosen the side of the oppressor. Thanks to the famed physicist's many contributions, including his accessible popular science books, every day readers have an opportunity to try and answer those very things. Was it all just a lucky chance? “A million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.”. If we find the answer to that, it would be the ultimate triumph of human reason. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. But it does so in a way that is impossible to calculate for an organism that is as complicated as a human being.

Try to make sense of what you see and wonder about what makes the universe exist. Einstein once asked the question: "How much choice did God have in constructing the universe?" We have certainly come a long way since Aristotle and Ptolemy, when we thought that the earth was the center of the universe! The general theory of relativity describes the force of gravity and the large-scale structure of the universe, that is, the structure on scales from only a few miles to as large as a million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe. A Brief History of Time - Stephen W. Hawking - Quotes. Or no conclusion at all?”, “If we do discover a complete theory, it should in time be understandable in broad principle by everyone, not just a few scientists. In addition to his laws of motion, Newton discovered a law to describe the force of gravity, which states that every body attracts every other body with a force that is proportional to the mass of each body. Presumably, he knew what he intended when he set it up! There are something like ten million million million million million million million million million million million million million million (1 with eighty zeroes after it) particles in the region of the universe that we can observe. If we find the answer to that, it would be the ultimate triumph of human reason - for then we would know the mind of God.


If you are neutral in situations of injustice, you have chosen the side of the oppressor. Stephen W. Hawking: Our Picture of the Universe Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

Collection of sourced quotations from A Brief History of Time (1988) by Stephen Hawking. Note: all page numbers and citation info for the quotes below refer to the Bantam edition of A Brief History of Time published in 1988. The Uncertainty Principle ... One such black hole could run ten large power stations, if only we could harness its power. ― Stephen Hawking, A Brief History of Time. 126 […] one evening in November that year, shortly after the birth of my daughter, Lucy, I started to think about black holes as I was getting into bed.

79 According to the theory of relativity, nothing can travel faster than light. "It is said that there's no such thing as a free lunch.



The reason… Stephen Hawking: Which came first, the chicken or the egg? Hawking addresses Aristotle and Ptolemy, the theory of a round world, and how the stars and the sun work as part of our universe. If the rate of expansion one second after the big bang had been smaller by even one part in a hundred thousand million million, the universe would have recollapsed before it ever reached its present size. 149 Stephen Hawking: I wanted to understand how the universe began. The success of scientific theories […] led the French scientist the Marquis de Laplace […] to argue that the universe was completely deterministic. If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: 'President Can't Swim.'. But as the universe expanded, the temperature of the radiation decreased. Hawking wrote the book for nonspecialist readers with no prior knowledge of scientific theories. Anything or anyone who falls through the event horizon will soon reach the region of infinite density and the end of time. Esta teoría trata los fenómenos que se producen a escalas muy pequeñas. Detailed explanations, analysis, and citation info for every important quote on LitCharts. 161 The original text plus a side-by-side modern translation of.


Despite being dubbed "the most popular book never read," A Brief History of Time is in fact one of bestselling popular science titles in the world.

23 likes. I still keep asking these ‘how’ and ‘why’ questions.

Most of the other stars that are visible to the naked eye lie within a few hundred light-years of us. He also looks into Copernicus, Galileo, Kepler, and Newton who worked to prove that the Earth goes around the sun.

The matter in the universe is made out of positive energy. So the only place to put such a black hole, in which one might use the energy it emitted, would be in orbit around the Earth - and the only way that one could get it to orbit the earth would be to attract it there by towing a large mass in front of it... 115 It would neither be created nor destroyed.

16 We certainly cannot predict future events exactly if we cannot even measure the present state of the universe precisely!

According to this theory [strong anthropic principle], there are either many different universes or many different regions of a single universe, each with its own initial configuration and, perhaps, with its own set of laws of science.

Hawking begins with Aristotle, who believed heavier things would fall fast… They have craved an understanding of the underlying order in the world. 12 144

“Por lo tanto, la mecánica cuántica introduce en la ciencia un elemento inevitable de impredecibilidad o aleatoriedad. Il tempo non avrà mai fine, almeno per quelli che sapranno essere abbastanza prudenti da non cadere in un buco nero.”, “La tradizione aristotelica riteneva anche che fosse possibile determinare tutte le leggi che governano l’universo per mezzo del puro pensiero: la verifica empirica attraverso l’osservazione non era considerata necessaria. ... one can calculate that the probable life of the proton must be greater than ten million million million million million years (1 with thirty-one zeros). So the question is: what are the truly elementary particles, the basic building blocks from which everything is made? Aristotle thought the earth was stationary and that the sun, the moon, the planets, and the stars moved in circular orbits about the earth. On the other hand, when one looks at "real" time, there's a very big difference between the forward and backward directions, as we all know. A complete, consistent, unified theory is only the first step: our goal is a complete understanding of the events around us, and of our own existence.

Space and Time



Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist. The Unification of Physics “You’re very clever, young man, very clever,” said the old lady. It also lost one of its most effective ambassadors, a pop culture icon whose accessible science writing, including many incredible quotes from A Brief History of Time, has inspired entire generations of readers to keep learning, keep exploring, and keep asking questions about the universe around them. History is a pack of lies about events that never happened told by people who weren't there.

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