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A Brief History of Time: From the Big Bang…

A Brief History of Time: From the Big Bang to Black Holes (original: 1988; edição: 1995)

de Stephen Hawking

MembrosResenhasPopularidadeAvaliação médiaMenções
18,192189192 (3.92)256
Stephen W. Hawking, widely regarded as the most brilliant physicist since Einstein, discusses in a friendly and self-deprecating manner age-old questions about the origin and fate of the universe. Difficult concepts are made simple by Hawking's familiar, accessible prose.
Título:A Brief History of Time: From the Big Bang to Black Holes
Autores:Stephen Hawking
Informação:Bantam Books (1995), Edition: New edition, Paperback, 240 pages
Coleções:Sua biblioteca

Detalhes da Obra

Uma Breve Historia do Tempo de Stephen Hawking (1988)

  1. 20
    Black Holes and Baby Universes and Other Essays de Stephen W. Hawking (gandalf_grey)
  2. 42
    Six Easy Pieces: Essentials of Physics Explained by Its Most Brilliant Teacher de Richard P. Feynman (OccamsHammer)
  3. 10
    The Fabric of the Cosmos: Space, Time, and the Texture of Reality de Brian Greene (Usuário anônimo)
    Usuário anônimo: Although it's longer, Brian Greene's book is much more easily digestible. Plus, he gives you an idea of what they're hoping to discover at the Large Hadron Collider.
  4. 00
    Knowledge and Wonder de Victor F. Weisskopf (erik_galicki)
    erik_galicki: I think Weisskopf strikes a better balance between big picture and detail. Hawking provides more detail on particle physics and cosmology, but I think Weisskopf makes the connections between the two more apparent and clearer.
  5. 00
    From Eternity to Here: The Quest for the Ultimate Theory of Time de Sean Carroll (steve.clason)
  6. 00
    Chaos and Harmony: Perspectives on Scientific Revolutions of the 20th Century de Xuan Thuan Trinh (Louve_de_mer)
  7. 17
    The Universe in a Single Atom: The Convergence of Science and Spirituality de Dalai Lama XIV (leahsimone)

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Mostrando 1-5 de 187 (seguinte | mostrar todas)
Cool book. I must re-read it and pay closer attention next time because I could have understood it better. My favorite chapter was "The arrow of time".

It is really interesting to me that we see time as moving "forward" because that is the only way we could see it. Not because that is the way that it is.
It's like those goggles that make you see up as down and down as up: your brain just cannot function that way and it flips the image. That doesn't mean that up is any more up than down. As far as your eye is concerned it's just light. We just need up to look a certain way.
I might have misunderstood it but it seems that our brain is doing the same thing with time. If it was even possible for there to exist something like a pair of trafalmadorian goggles that allowed you to perceive time the other way round, remembering the future, it would just flip everything back again.

I love that my copy was marketed to kids. We patronize kids far too much, I don't see any reason why they shouldn't read this and I think it would make a great birthday present for any child that likes reading and has some curiosity about the universe. ( )
  RebeccaBooks | Sep 16, 2021 |
Told in language we all can understand, A Brief History of Time plunges into the exotic realms of black holes and quarks, of antimatter and “arrows of time,” of the big bang and a bigger God--where the possibilities are wondrous and unexpected.
  BLTSbraille | Sep 6, 2021 |
  hpryor | Aug 8, 2021 |
Great read. ( )
  nitins | Jul 28, 2021 |
Oof. That's an intense book.

Hawking does an impressive job of making cosmology and the Big Bang and black holes seem relatively digestable, but even for me--with a strong background in mathematics, a pretty decent one in at least undergradate level physics and a stronger study specifically in quantum weirdness, albeit more from a computational perspective--this book is hard to read at times.

Well worth the read though. I learned all sorts of crazy things. (Just read the book, but if you need even more convincing...)

Yet another proof the Earth is round:

First, he realized that eclipses of the moon were caused by the earth coming between the sun and the moon. The earth’s shadow on the moon was always round, which would be true only if the earth was spherical. If the earth had been a flat disk, the shadow would have been elongated and elliptical, unless the eclipse always occurred at a time when the sun was directly under the center of the disk.

Kepler didn't like orbits not being perfect circles:

As far as Kepler was concerned, elliptical orbits were merely an ad hoc hypothesis, and a rather repugnant one at that, because ellipses were clearly less perfect than circles.

Relativity is measurable even on the scale of the orbit of Mercury:

For example, very accurate observations of the planet Mercury revealed a small difference between its motion and the predictions of Newton’s theory of gravity.

Mass doesn't increase as quickly as I'd thought as you get up towards light speed:

For example, 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.

Another way of looking at how large masses actually 'curve' three dimensional space, and 'into what':

The mass of the sun curves space-time in such a way that although the earth follows a straight path in four-dimensional space-time, it appears to us to move along a circular orbit in three-dimensional space.

Physicists get weird when it comes to naming things:

It is believed that this force is carried by another spin-1 particle, called the gluon, which interacts only with itself and with the quarks. The strong nuclear force has a curious property called confinement: it always binds particles together into combinations that have no color. One cannot have a single quark on its own because it would have a color (red, green, or blue). Instead, a red quark has to be joined to a green and a blue quark by a “string” of gluons (red green blue = white). Such a triplet constitutes a proton or a neutron. Another possibility is a pair consisting of a quark and an antiquark (red antired, or green antigreen, or blue antiblue = white).

Even more weirdness than expected when it comes to the speed of light being constant:

A cannonball fired upward from the earth will be slowed down by gravity and will eventually stop and fall back; a photon, however, must continue upward at a constant speed. How then can Newtonian gravity affect light?

When you get into the scale of space, numbers can get unintuitive:

The rate of energy loss in the case of the earth and the sun is very low—about enough to run a small electric heater. This means it will take about a thousand million million million million years for the earth to run into the sun, so there’s no immediate cause for worry!

Hawking has an amusing sense of humor:

Despite this, I had a bet with Kip Thorne of the California Institute of Technology that in fact Cygnus X-l does not contain a black hole! This was a form of insurance policy for me. I have done a lot of work on black holes, and it would all be wasted if it turned out that black holes do not exist.

I started to think about black holes as I was getting into bed. My disability makes this rather a slow process, so I had plenty of time.

Despite being one of the craziest events in the history of our universe, the Big Bang didn't last very long:

Within only a few hours of the big bang, the production of helium and other elements would have stopped. And after that, for the next million years or so, the universe would have just continued expanding, without anything much happening.

Thinking about the universe or space-time itself leads to some interesting questions:

His space-time had the curious property that the whole universe was rotating. One might ask: “Rotating with respect to what?” The answer is that distant matter would be rotating with respect to directions that little tops or gyroscopes point in.

Einstein wasn't perfect (and causality and faster than light travel have some issues):

This had the side effect that it would be possible for someone to go off in a rocket ship and return to earth before he set out. This property really upset Einstein, who had thought that general relativity wouldn’t allow time travel. However, given Einstein’s record of ill-founded opposition to gravitational collapse and the uncertainty principle, maybe this was an encouraging sign.

More humor:

There was a young lady of Wight Who travelled much faster than light. She departed one day, In a relative way, And arrived on the previous night.

Just what a Grand Unified Theory of Everything could mean:

However, 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.

A factoid about Galileo's relationships with the Church that I'd not heard of before:

In 1623, a longtime friend of Galileo’s became the Pope. Immediately Galileo tried to get the 1616 decree revoked.

And finally, a bit of an understatement:

In the twenty years since the last revision of this book, progress in cosmology has been rapid.

Like I said. A fascinating book. Worth the read.
( )
  jpv0 | Jul 21, 2021 |
Mostrando 1-5 de 187 (seguinte | mostrar todas)
Through his cerebral journeys, Mr. Hawking is bravely taking some of the first, though tentative, steps toward quantizing the early universe, and he offers us a provocative glimpse of the work in progress.

» Adicionar outros autores (79 possíveis)

Nome do autorFunçãoTipo de autorObra?Status
Hawking, Stephenautor principaltodas as ediçõesconfirmado
Jackson, MichaelNarradorautor secundárioalgumas ediçõesconfirmado
Jonkers, RonaldTradutorautor secundárioalgumas ediçõesconfirmado
Kober, HainerTradutorautor secundárioalgumas ediçõesconfirmado
Kreitmeyer, JensDesigner da capaautor secundárioalgumas ediçõesconfirmado
Miller, RonIlustradorautor secundárioalgumas ediçõesconfirmado
Sagan, CarlIntroduçãoautor secundárioalgumas ediçõesconfirmado
Schmidt, BerndConsultant (German Translation)autor secundárioalgumas ediçõesconfirmado
Souriau, IsabelleTradutorautor secundárioalgumas ediçõesconfirmado
Varteva, RistoTradutorautor secundárioalgumas ediçõesconfirmado
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Stephen W. Hawking, widely regarded as the most brilliant physicist since Einstein, discusses in a friendly and self-deprecating manner age-old questions about the origin and fate of the universe. Difficult concepts are made simple by Hawking's familiar, accessible prose.

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