Quotes from A Briefer History of Time

“What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.”
― Stephen Hawking, quote from A Briefer History of Time

“It's the gravity that shapes the large scale structure of the universe, even though it is the weakest of four categories of forces.”
― Stephen Hawking, quote from A Briefer History of Time

“Intelligence is the ability to adapt to change.

Stephen Hawking”
― Stephen Hawking, quote from A Briefer History of Time

“The uncertainty principle signaled an end to Laplace's dream of a theory of science, a model of the universe that would be completely deterministic. We certainly cannot predict future events exactly if we cannot even measure the present state of the universe precisely!

We could still imagine that there is a set of laws that determine events completely for some supernatural being who, unlike us, could observe the present state of the universe without disturbing it. However, such models of the universe are not of much interest to us ordinary mortals. It seems better to employ the principle of economy known as Occam's razor and cut out all the features of the theory that cannot be observed.”
― Stephen Hawking, quote from A Briefer History of Time

“If a star were a grain of salt, you could fit all the stars visible to the naked eye on a teaspoon, but all the stars in the universe would fill a ball more than eight miles wide.”
― Stephen Hawking, quote from A Briefer History of Time

“Yet if there really were a complete unified theory, it would also presumably determine our actions—so the theory itself would determine the outcome of our search for it! And why should it determine that we come to the right conclusions from the evidence? Might it not equally well determine that we draw the wrong conclusion? Or no conclusion at all?”
― Stephen Hawking, quote from A Briefer History of Time

“an elipse is an elongated circle”
― Stephen Hawking, quote from A Briefer History of Time

“El siglo XX también vio nacer otra gran teoría parcial de la naturaleza: la mecánica cuántica. Esta teoría trata los fenómenos que se producen a escalas muy pequeñas. Nuestra concepción del big bang nos indica que debió de haber un momento en que el universo muy primitivo era tan pequeño que, incluso al estudiar su estructura «a gran escala», no es posible ignorar los efectos de pequeña escala de la mecánica cuántica.

Nuestra mayor esperanza de obtener una comprensión completa del universo desde su principio hasta su final implica combinar estas dos teorías parciales en una sola teoría cuántica de la gravedad. [...] Cuando se combina la relatividad general con el principio de incertidumbre de la mecánica cuántica surge la posibilidad de que tanto el espacio como el tiempo sean finitos, pero sin tener bordes ni fronteras. Y es posible que las leyes ordinarias de la ciencia se cumplan en todos los sitios, incluida la región inicial del tiempo, sin necesidad de que haya en ella singularidad alguna.”
― Stephen Hawking, quote from A Briefer History of Time

“Por lo tanto, la mecánica cuántica introduce en la ciencia un elemento inevitable de impredecibilidad o aleatoriedad. Einstein se opuso rotundamente a ello, a pesar del importante papel que había desempeñando en el desarrollo de estas ideas. [...]

La prueba de una teoría científica es su capacidad de predecir los resultados de un experimento. La teoría cuántica limita nuestras posibilidades. ¿Limita la teoría cuántica la ciencia? Para progresar, la manera en que hacemos ciencia debe ser dictada por la naturaleza. En este caso, la naturaleza exige que redefinamos lo que entendemos por predicción: quizá no podamos predecir exactamente el resultado de un experimento, pero podemos repetirlo muchas vces y confirmar que los diversos resultado posibles ocurren con las probabilidades predichas por la teoría cuántica. Así, a pesar del primer principio de incertidumbre, no es necesario abandonar la creencia en un mundo regido por leyes físicas.”
― Stephen Hawking, quote from A Briefer History of Time

“If we do discover a complete theory, it should in time be understandable in broad principle by everyone, not just a few scientists. 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. 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.”
― Stephen Hawking, quote from A Briefer History of Time

“Dios no solo juega a los dados, a veces los tira donde no se pueden ver.”
― Stephen Hawking, quote from A Briefer History of Time

“(Alexander) Friedmann sólo dedujo un modelo de universo, pero, si sus suposiciones son correctas, hay en realidad tres posibles tipos de soluciones de las ecuaciones de Einstein, es decir, tres diferentes tipos de modelos de Friedmann, y tres diferentes comportamientos del universo.

1. En el primer tipo de solución (el que descubrió Friedmann) el universo se expande con suficiente lentitud como para que la atracción gravitatoria entre las galaxias vaya frenando la expansión hasta llegar a detenerla, tras lo cual las galaxias empiezan a aproximarse las unas a las otras y el universo se contrae.

2. En el segundo tipo de solución, el universo se expande tan rápidamente que la atracción gravitatoria no puede llegar a frenarlo nunca, aunque sí va reduciendo su ritmo de expansión.

3. Finalmente, en un tercer tipo de solución, el universo se expande con el ritmo justo para impedir que se vuelva a colapsar. La velocidad con que las galaxias se separan va disminuyendo progresivamente, pero nunca llega a alcanzar el valor cero.

[...]

Otras observaciones recientes indican que la expansión del universo en realidad no se está frenando, sino que se está acelerando.”
― Stephen Hawking, quote from A Briefer History of Time

About the author

Popular quotes

“Not everything is your truth," she said tersely. "Some things are just true.”
― Austin Chant, quote from Peter Darling

“That's the way with sentimental things: it's the memory the junk conjures that's valuable, not the junk itself.”
― T. Greenwood, quote from Undressing the Moon

“fighting emotion with logic is like bringing a calculator to a knife fight.”
― Josh Sundquist, quote from We Should Hang Out Sometime: Embarrassingly, a True Story

“"Pounding steps approached in the night. Malachi appeared out of the black, shirtless and dripping despite the cool evening air. (He was out for a run and just returned.) His talesm seemed to glow when he caught sight of her, a low sliver light in the darkness. He said nothing, shooting Rhys a glare as he walked past them and into the house.

'Has he kissed you?' Rhys asked when Malachi was gone.
'Yes, on the island.'
'Was it more than fine?' (She had described Rhy's kiss as 'fine' previous to this scene.)
Her breath left her body in a rush of memories. 'So much more than fine.'
He nudged her shoulder with his own. 'Then don't be stubborn, go to him.'

Fifteen minutes and another glass of wine later, Ava knocked on his door. Malachi opened it, holding a towel. He'd showered, and a few drops of water still clung to his tanned shoulders. He wore a pair of loose pants and a guarded expression.
'What do you want?'
'I kissed Rhys.'
Now she knew she wasn't imagining it. The tattoos pulsed silver in the dim light of the hall. Ava forced her eyes back to Malachi's face which was locked down tight. Only a tic in his jaw told Ava her words have even been heard.
His voice was low and thick with tension. 'Get that out of your system?'
'Felt a little like kissing my brother.'
He dropped the towel and tugged her into the room.'This won't' "”
― Elizabeth Hunter, quote from The Scribe

“Fantaseó con una cerilla y un bidón de gasolina.”
― Stieg Larsson, quote from Stieg Larsson's Millennium Trilogy Deluxe Boxed Set

Interesting books

About BookQuoters

BookQuoters is a community of passionate readers who enjoy sharing the most meaningful, memorable and interesting quotes from great books. As the world communicates more and more via texts, memes and sound bytes, short but profound quotes from books have become more relevant and important. For some of us a quote becomes a mantra, a goal or a philosophy by which we live. For all of us, quotes are a great way to remember a book and to carry with us the author’s best ideas.

We thoughtfully gather quotes from our favorite books, both classic and current, and choose the ones that are most thought-provoking. Each quote represents a book that is interesting, well written and has potential to enhance the reader’s life. We also accept submissions from our visitors and will select the quotes we feel are most appealing to the BookQuoters community.

Founded in 2018, BookQuoters has quickly become a large and vibrant community of people who share an affinity for books. Books are seen by some as a throwback to a previous world; conversely, gleaning the main ideas of a book via a quote or a quick summary is typical of the Information Age but is a habit disdained by some diehard readers. We feel that we have the best of both worlds at BookQuoters; we read books cover-to-cover but offer you some of the highlights. We hope you’ll join us.