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2 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 A better way to fall in love with Physics !, 9 octobre 2002
Par Un client
Ce commentaire fait référence à cette édition : A Brief History of Time (Broché)
As we are living in this beautiful scientific era, we should get the most of the what human brain has come up with over thousands of years !
In his best seller, Pr. Hawking gives a historical approach to the way prominent scientists describe the universe. From Ptolome until the beginning of this century, many theories have been competing to find the right laws that govern the solar system and the universe.
In his book, the author in his wheelchair, describes in an easy way the recent theories explaining the way the universe was born and the way it is growing. From quarks to black holes and from the big bang to the big crunch, the author takes us to a trip in time to elucidate the secrets of this 'strange and beautiful' evolving universe.
It is easy to understand, no mathematical background required, so every one is invited to enjoy the knowledge.
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1 internaute sur 1 a trouvé ce commentaire utile :
5.0 étoiles sur 5 Time is of the essence, 21 décembre 2005
Par 
FrKurt Messick "FrKurt Messick" (Bloomington, IN USA) - Voir tous mes commentaires
(TOP 1000 COMMENTATEURS)   
Ce commentaire fait référence à cette édition : A Brief History Of Time: Tenth Anniversary Edition (Relié)
The mark of a true educator, which Stephen Hawking certainly is, is that he would take time (very valuable time, in his case) away from research and contemplation of the great mysteries of the universe to write a piece that would serve to help explain to the greater number of less-scientifically-adept persons the fruits and implications of modern scientific research from the cutting edge of physics. Hawking is ranked in popular and scientific thinking on a par with Einstein, and has motor neuron disability that severely restricts his ability to move, even to type or write, so, when he takes time to write something for general consumption, it is probably going to be worthwhile. And indeed, this is.
'Someone told me that each equation I included in the book would halve sales. I therefore resolved not to have any equations at all. In the end, however, I did put in one equation, Einstein's famous equation. I hope that this will not scare off half of my potential readers.'
Hawking begins by exploring the large scale structure of the universe (time being part of the `fabric' of the universe, in spacetime), the connections of space and time as a relatively new concept in thinking of the universe, and the way the universe `acts' (cosmological dynamics). From there, he explores the universe at a very basic level, as elementary particles and forces of nature, introducing quarks.
'There are a number of different varieties of quarks: there are thought to be at least six "flavours", which we call up, down, strange, charmed, bottom and top. Each flavour comes in three "colours", red, green and blue. ...We now know that neither the atoms nor the protons and neutrons within them are indivisible. So the question is: What are the truly elementary particles, the basic building blocks from which everything is made?'
From this discussion Hawking proceeds to black holes (and the fact that they aren't so black and permanent as popular belief holds them to be), which circles back around to the origin and destiny of the universe (which relates back to the large-scale structure), which ultimately brings us to time. This is where things begin to get interesting.
'When one tried to unify gravity with quantum mechanics, one had to introduce the idea of "imaginary" time. Imaginary time is indistinguishable from directions in space. If one can go north, one can turn around and head south; equally, if one can go forward in imaginary time, one ought to be able to turn around and go backward.'
Hawking explains variations of the thermodynamic, psychological and cosmological laws that regulate the direction of time's arrow, which, despite the theoretical flexibility of time with regard to scientific principles, always apparently goes in one direction.
Finally, Hawking explores the most current topic in theoretical physics: unification theories, which may or may not be a wild goose on the loose. Hawking also explores what such a grand unified theory (also called sometimes the `theory of everything') would mean, and what it wouldn't mean. But Hawking assures us that the quest for understanding is worthwhile even it won't be the final word on everything.
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5.0 étoiles sur 5 Time is of the essence, 21 décembre 2005
Par 
FrKurt Messick "FrKurt Messick" (Bloomington, IN USA) - Voir tous mes commentaires
(TOP 1000 COMMENTATEURS)   
Ce commentaire fait référence à cette édition : A Brief History of Time: From the Big Bang to Black Holes (CD)
The mark of a true educator, which Stephen Hawking certainly is, is that he would take time (very valuable time, in his case) away from research and contemplation of the great mysteries of the universe to write a piece that would serve to help explain to the greater number of less-scientifically-adept persons the fruits and implications of modern scientific research from the cutting edge of physics. Hawking is ranked in popular and scientific thinking on a par with Einstein, and has motor neuron disability that severely restricts his ability to move, even to type or write, so, when he takes time to write something for general consumption, it is probably going to be worthwhile. And indeed, this is.
'Someone told me that each equation I included in the book would halve sales. I therefore resolved not to have any equations at all. In the end, however, I did put in one equation, Einstein's famous equation. I hope that this will not scare off half of my potential readers.'
Hawking begins by exploring the large scale structure of the universe (time being part of the `fabric' of the universe, in spacetime), the connections of space and time as a relatively new concept in thinking of the universe, and the way the universe `acts' (cosmological dynamics). From there, he explores the universe at a very basic level, as elementary particles and forces of nature, introducing quarks.
'There are a number of different varieties of quarks: there are thought to be at least six "flavours", which we call up, down, strange, charmed, bottom and top. Each flavour comes in three "colours", red, green and blue. ...We now know that neither the atoms nor the protons and neutrons within them are indivisible. So the question is: What are the truly elementary particles, the basic building blocks from which everything is made?'
From this discussion Hawking proceeds to black holes (and the fact that they aren't so black and permanent as popular belief holds them to be), which circles back around to the origin and destiny of the universe (which relates back to the large-scale structure), which ultimately brings us to time. This is where things begin to get interesting.
'When one tried to unify gravity with quantum mechanics, one had to introduce the idea of "imaginary" time. Imaginary time is indistinguishable from directions in space. If one can go north, one can turn around and head south; equally, if one can go forward in imaginary time, one ought to be able to turn around and go backward.'
Hawking explains variations of the thermodynamic, psychological and cosmological laws that regulate the direction of time's arrow, which, despite the theoretical flexibility of time with regard to scientific principles, always apparently goes in one direction.
Finally, Hawking explores the most current topic in theoretical physics: unification theories, which may or may not be a wild goose on the loose. Hawking also explores what such a grand unified theory (also called sometimes the `theory of everything') would mean, and what it wouldn't mean. But Hawking assures us that the quest for understanding is worthwhile even it won't be the final word on everything.
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5.0 étoiles sur 5 Time is of the essence, 20 décembre 2005
Par 
FrKurt Messick "FrKurt Messick" (Bloomington, IN USA) - Voir tous mes commentaires
(TOP 1000 COMMENTATEURS)   
Ce commentaire fait référence à cette édition : A Brief History of Time (Broché)
The mark of a true educator, which Stephen Hawking certainly is, is that he would take time (very valuable time, in his case) away from research and contemplation of the great mysteries of the universe to write a piece that would serve to help explain to the greater number of less-scientifically-adept persons the fruits and implications of modern scientific research from the cutting edge of physics. Hawking is ranked in popular and scientific thinking on a par with Einstein, and has motor neuron disability that severely restricts his ability to move, even to type or write, so, when he takes time to write something for general consumption, it is probably going to be worthwhile. And indeed, this is.
'Someone told me that each equation I included in the book would halve sales. I therefore resolved not to have any equations at all. In the end, however, I did put in one equation, Einstein's famous equation. I hope that this will not scare off half of my potential readers.'
Hawking begins by exploring the large scale structure of the universe (time being part of the `fabric' of the universe, in spacetime), the connections of space and time as a relatively new concept in thinking of the universe, and the way the universe `acts' (cosmological dynamics). From there, he explores the universe at a very basic level, as elementary particles and forces of nature, introducing quarks.
'There are a number of different varieties of quarks: there are thought to be at least six "flavours", which we call up, down, strange, charmed, bottom and top. Each flavour comes in three "colours", red, green and blue. ...We now know that neither the atoms nor the protons and neutrons within them are indivisible. So the question is: What are the truly elementary particles, the basic building blocks from which everything is made?'
From this discussion Hawking proceeds to black holes (and the fact that they aren't so black and permanent as popular belief holds them to be), which circles back around to the origin and destiny of the universe (which relates back to the large-scale structure), which ultimately brings us to time. This is where things begin to get interesting.
'When one tried to unify gravity with quantum mechanics, one had to introduce the idea of "imaginary" time. Imaginary time is indistinguishable from directions in space. If one can go north, one can turn around and head south; equally, if one can go forward in imaginary time, one ought to be able to turn around and go backward.'
Hawking explains variations of the thermodynamic, psychological and cosmological laws that regulate the direction of time's arrow, which, despite the theoretical flexibility of time with regard to scientific principles, always apparently goes in one direction.
Finally, Hawking explores the most current topic in theoretical physics: unification theories, which may or may not be a wild goose on the loose. Hawking also explores what such a grand unified theory (also called sometimes the `theory of everything') would mean, and what it wouldn't mean. But Hawking assures us that the quest for understanding is worthwhile even it won't be the final word on everything.
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1 internaute sur 1 a trouvé ce commentaire utile :
5.0 étoiles sur 5 Mon livre, 23 décembre 2012
Achat vérifié(De quoi s'agit-il ?)
Ce commentaire fait référence à cette édition : A Brief History Of Time: From Big Bang To Black Holes (Broché)
Bien reçu, très rapide ! Et livre extra ;)
Les prix (livre et frais de port) sont très raisonnables. Je recommande cet acheteur et ce livre !

Joyeuses fêtes de fin d'année
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5.0 étoiles sur 5 Amazing book, 26 novembre 2012
Par 
Achat vérifié(De quoi s'agit-il ?)
Ce commentaire fait référence à cette édition : A Brief History Of Time: From Big Bang To Black Holes (Broché)
The book is an amazing recital of physics brought down to the ordinary human beings' intellectual levels, an excellant choice
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5.0 étoiles sur 5 Fantastique!, 30 mai 2002
Par Un client
Ce commentaire fait référence à cette édition : A Brief History of Time: And Other Essays (Relié)
Ce livre est un detour obligatoire pour toutes les personnes interessées par l'histoire de l'univers et non par les petits soucis a l'échelle humaine. Hawking nous conduit dans une multitude de concepts expliqués avec une simplicité etonnante. A acheter!
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5.0 étoiles sur 5 Amazing book, 8 juillet 2014
Achat vérifié(De quoi s'agit-il ?)
Ce commentaire fait référence à cette édition : A Brief History Of Time: From Big Bang To Black Holes (Broché)
Clear, understandable, even (I think) for non scientists. Impressive for such a complicated subject that modern physics is. A masterpieace.
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5.0 étoiles sur 5 Meilleure Introduction au Monde de la Physique Théorique, 16 mai 2014
Achat vérifié(De quoi s'agit-il ?)
Ce commentaire fait référence à cette édition : A Brief History Of Time: From Big Bang To Black Holes (Broché)
Un livre que je conseillerais à toute personne voulant comprendre les secrets de l'univers , peut importe le niveau de connaissances en physique !
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4.0 étoiles sur 5 Good read, 5 juin 2013
Achat vérifié(De quoi s'agit-il ?)
Ce commentaire fait référence à cette édition : A Brief History Of Time: From Big Bang To Black Holes (Broché)
Almost makes science cool. Easy to read. Goes around in circles on some chapters in so much as it must be quite diffiicult to simplify complex scientific concepts to novice readers like myself.
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A Brief History Of Time: From Big Bang To Black Holes
A Brief History Of Time: From Big Bang To Black Holes de Stephen Hawking (Broché - 18 août 2011)
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