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¿Hay otras dimensiones más allá de las de nuestra experiencia cotidiana? ¿Hay puertas de acceso a universos paralelos? ¿Qué sucedió antes del primer día de la Creación? Este tipo de cuestiones están en el centro de la actividad científica actual. En efecto, muchos físicos creen hoy que existen otras dimensiones más allá de las cuatro de nuestro espacio-tiempo, y que puede alcanzarse una visión unificada de las diversas fuerzas de la naturaleza, si consideramos que todo lo que vemos a nuestro alrededor, desde los árboles hasta las estrellas, no son sino vibraciones en el hiperespacio. La teoría del hiperespacio –y su derivación más reciente, la teoría de supercuerdas– es el ojo de esta revolución. En este libro, Michio Kaku nos muestra un panorama fascinante, que cambia por completo nuestra visión del cosmos, y nos lleva a un deslumbrante viaje por nuevas dimensiones: agujeros de gusano que conectan universos paralelos, máquinas del tiempo, «universos bebé» y otras maravillas semejantes van surgiendo en unas páginas en las que todo se explica con una elegante sencillez y donde la formulación matemática es reemplazada por imaginativas ilustraciones que permiten visualizar los problemas. El resultado es un libro muy ameno y sorprendente, que incluso deja atrás las mayores fantasías de los viejos autores de ciencia ficción.

First published January 1, 1994

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About the author

Michio Kaku

70 books6,094 followers
(Arabic: ميشيو كاكو
Russian: Митио Каку
Chinese: 加來道雄
Japanese: ミチオ・カク)

Dr. Michio Kaku is an American theoretical physicist at the City College of New York , best-selling author, a futurist, and a communicator and popularizer of science. He has written several books about physics and related topics of science.

He has written two New York Times Best Sellers, Physics of the Impossible (2008) and Physics of the Future (2011).

Dr. Michio is the co-founder of string field theory (a branch of string theory), and continues Einstein’s search to unite the four fundamental forces of nature into one unified theory.

Kaku was a Visitor and Member (1973 and 1990) at the Institute for Advanced Study in Princeton, and New York University. He currently holds the Henry Semat Chair and Professorship in theoretical physics at the City College of New York.

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5 stars
9,833 (44%)
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3 stars
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Displaying 1 - 30 of 593 reviews
Profile Image for Nathan.
233 reviews187 followers
September 17, 2007
Michio Kaku apparently spent his childhood building super-colliders in his parents' garage. It paid off. He's clearly brilliant, and best of all, he's not lost his imagination. One sad fact of modern physicists is that precious few of them have any imagination, and are incapable of thought experiments and relative flights of fantasy. As Kaku has pointed out, fantasy fueled more great discoveries in science than pure science ever did on its own. In this book he uses what we know about quantum physics to explore possibilities formerly relegated exclusively to science fiction. In doing so, he should be admired. He is merely asking us to consider what some great minds in both literature and physics have imagined, and in doing so, manages to make what we do know seem almost simple by showing us how much we truly don't know. He's amazingly talented, imaginative, and best of all, he knows his math. He also knows how to use that math to dream of what's possible. An absolutely fun book to read.

7 reviews3 followers
August 31, 2007
This is the book that allowed me to fool an entire room of graduate students into thinking I was utterly Brilliant. It is a really good crash course on just what the hell Quantum, String, Unified Field Theory ad Superstring actually are. Lays down the history and concepts in a way that makes sense and makes you get it.

Particularly savvy readers will start making the other logical leaps. If we are thinking energy vibrating along a 10-dimensional string, what does that say about the frequency of sentience in the universe? Since energy can't go anywhere and sentience is a factor of energy, what the hell really does happen to us when we die?

Enjoy your trip down the rabbit hole.
Profile Image for Julian Worker.
Author 33 books341 followers
March 30, 2022
I think this book is superb.

String theory is complicated and it would be easy to make the subject dense and unappealing.

However. Michio Kaku has a lightness of touch that enables the reader to think they might understand what's going in in our world where the extra dimensions are rolled up to the size of the Planck length.

The author also includes references to the great scientists of yesterday, the Newtons, Faradays, Maxwells as well as the scientists of the 20th Century allowing the reader to see how theories have changed through the centuries.

There's an intriguing section on Type I, II, and III civilisations.

The Earth is a Type 0 civilisation at the moment.

A Type I civilisation is one that controls the energy resources of an entire planet, controls the weather on its home planet, and has explored its own solar system.

A Type II civilisation is one that controls the power of the sun and has begun the colonisation of local star systems.

A Type III civilisation is one that controls the power of an entire galaxy and can probably manipulate space-time.

It's almost certain that any visitors from outer space to Earth would be from a Type III civilisation, in which case why would they bother with us? We'd have nothing to impress them and anything they could pass on to us would be beyond us, almost like a human communicating with an ant colony and trying to teach them how to build a solar panel.
Profile Image for Kelvin.
300 reviews12 followers
February 7, 2016
DNF at chapter 10. It was a bit too dry and technical for me. While the chapter names were intriguing and there were interesting anecdotes in each chapter, it was still slightly too boring, even with the pictures, for me to read into and understand the developments of modern physics. There wasn't much holding it together, i.e. the book only follows the overthrow of each theory as its organizing structure. It also seemed to ramble on with analogies that weren't that great to follow, eg the wood vs marble and flatland comparisons. Though I'm sure that Michio Kaku is quite knowledgable about the theories mentioned in the book (as evidenced by his other books) I expected this book to be more in story form like Flatterland and thus easier to read. Overall, this book was just disappointing for me. I expected it to be a fun and informative telling of the evolution of dimensional theories but ended up getting a book that was difficult to read and closer to a paper than novel.
Profile Image for Jimmy Ele.
233 reviews86 followers
April 15, 2017
5 stars for his lessons on physics, science, and mathematics. No stars for his musings on religion, god, and evolution.
Profile Image for kesseljunkie.
224 reviews5 followers
July 19, 2017
It was OK just because the science fiction at the end was a lot of fun.

Dr. Kaku alternates through two styles -- talking to the reader like they're completely stupid and then talking to them like they've taken a college physics class. I'm neither, I understood what he was writing, and was just insulted. The cornerstone of Hyperspace theory is that there were 10 dimensions for a fraction of a fraction of time in the first fraction of time of existence for this universe, but 6 of them probably don't exist since. Um, so there aren't 10 dimensions -- there might have been. And then the whole premise is that I should accept the premises in the book even though he acknowledges there may never be proof?

And the difference between this and religion is....oh, I see, there is none. Fifth dimensional beings could exist, but not God? Interesting assertion. So long as we're just accepting things on faith, let me toss this one out there: God is a 5th dimensional being.

But of course, it's sexy to act like you're smart -- and when someone like Dr. Kaku publishes a sexy bit of science fiction and calls it researched science, everyone's afraid to look like they don't "get it." It's like living in a Rand novel.

It's OK to call bullsh*t on someone in the sciences, people. And in this instance, I do.
15 reviews
July 29, 2007
If you've thought science is dull or perhaps too far beyond you, then please meet Michio Kaku. He writes about theoretical physics in a way that will fill you with wonder and possibility. He takes what would otherwise be very complex concepts and conveys them using metaphors that every average joe can understand. The number of a-ha moments I had reading this book were too many to count. What a terrific read.
Profile Image for Sabiba Hossain.
147 reviews17 followers
March 26, 2021
I got this on my birthday from my mother. Thank you 💝💝💝💝
Wow! What a wild ride it was! From history to science, from scientists to ports, this book left no stones unturned. Although I wanted a book with more equations and mathematics ,and this book had ZERO equations, I loved it immensely. I didn't know topics like string theory,why 10 dimensions are needed etc and this book made them clear for me. Again, I knew topics like relativity and quantum mechanics, but didn't know the history behind them. This book was long, and took me a long time to finish it, but it was worth it.
Pros: easy language, fluid writing style, covered interesting and complexed concepts like hyperspace, quantum mechanics, relativity, particle physics and cosmology.
Cons: Can be felt boring from time to time because of the history part.
Profile Image for David.
Author 1 book34 followers
November 30, 2014
Started strong. An introduction to non-Euclidian geometry, string theory, and related concepts. Made me fantasize about learning the math.

Got more and more speculative toward the end, and not so interestingly so. Like many books, this one would have been improved by a ruthless editor. Still, worth a read if the topic interests you.
Profile Image for Shawna.
8 reviews1 follower
October 10, 2007
This is one of the popular science books that got me so interested in doing physics in the first place. Accessible to me before I even took a physics class, it should be accessible to most anyone with interest. Very interesting questions raised about space and time/parallel universes/etc. New ideas (as of date published: 1994) are discussed in a non-technical way. Also, very well written and easy to read (with humor and everything!).
Profile Image for Marc.
748 reviews105 followers
August 19, 2015
Michio Kaku makes some amazingly complex and mind-bending concepts accessible to the lay reader (i.e., me, and maybe you, too, if you're also not a physicist). He sprinkles the book with entertaining and informative anecdotes and his passion for the topic is infectious. Still, I shudder to think that no author ever addresses Schrödinger's ailurophobia. Here's hoping the 6-dimensional universe opens up just as this one closes!
Profile Image for Rich Paz.
Author 1 book59 followers
February 14, 2017
I am now officially a Michio Kaku fan. This book explains physics as it should be taught in school. His simplistic approach begs the reader for more information. I also love physics now because I understand it a lot more thanks to Mr. Kaku's books. The school systems should think about this book as part of their cirriculum to teach the importance of understanding physics. Highly recommended.
Profile Image for Macoco G.M..
Author 3 books183 followers
February 22, 2016
Un libro fantástico para descubrir una nueva perspectiva del universo.
Profile Image for Agata Baczewska.
36 reviews2 followers
February 4, 2023
I'll come back to this as soon as I extend my knowledge of Kaluza-Klein theory a mathematical basis (therefore I have not rate it yet). The book is substantive and mostly intelligible, although you need to evince more interest in higher dimensions and physics than an average i-like-watching-interstellar person to understand the string theory.

// page ~230, for now 8/10
Profile Image for Koen Crolla.
727 reviews174 followers
September 16, 2019
Hyper-generic pop-sci driven to its apex.
For all that it pretends to be a coherent exploration of higher dimensions in both senses of the word (mathematical and sci-fi), Hyperspace is a series disconnected vignettes more concerned with hitting every topic on his list of popular science tropes than telling a coherent story—everything you could expect to be in a work of popular physics is in here, regardless of how much sense it makes to include it. If you're looking forward to seeing another triangle drawn on a saddle or reading another synopsis of that Heinlein story about the girl who became her own parents, Kaku's your guy. (For a while he had me wondering if I'd already read this one and just forgot to review it, but no.)
The physics stuff is mostly⁰ covered in the exact same (shallow) way almost everyone else has covered it,¹ but he doesn't stick to that, because other writers don't. His inevitable discussion of things like the anthropic principle and the cosmological argument (you know: those things that were in all pop-sci from, say, the '80s all through The God Delusion, after which they mysteriously became less fashionable) seem calculated to miss the point in a way that's meant to annoy literally anyone with any opinion at all, but they're not even the most embarrassing sections of the book—that would be the ``futurology''² that takes up most of the last quarter of it (I hope you like reading about the Kardashev scale again!).

In fairness I should also point out that this book was published in 1994, so it does predate a few hundred (but by no means all) of the books that made popular physics such a tired and derivative cottage industry; I don't think that excuses this one.
Writers who have written this exact book in a more competent way include Brian Greene, Brian Cox, and Michio Kaku.


⁰ His discussion of Schrödinger's cat is notably worse.

¹ Kaku did manage to do something Lee Smolin and Peter Woit never could: make me doubt that string theory is actually a meaningful thing and not just a mathematical artefact; a lot of the big insights in his own actual work that he brings up do seem to come down to realising something he came up with was just a way of rephrasing older laws.

² A ``futurologist'', of course, being a sci-fi nerd with delusions of grandeur.
Profile Image for Lucy.
132 reviews1 follower
October 24, 2018
Michio Kaku je mým oblíbeným teoretickým fyzikem. Při čtení jeho knih si říkám, že kdyby profesoři na univerzitách měli aspoň polovinu jeho nadání popisovat složitou kvantovou fyziku tak, jako to dělá on, určitě bychom měli více inženýrů a třeba bych mezi ně patřila i já.
Kaku ve své starší knize s názvem Hyperprostor poutavě a zajímavě nastiňuje taková témata, jakými jsou světy vně prostoru a času, teorie superstrun, desátý rozměr, ale i černé díry, cestování časem a další osud vesmíru. Neříkám, že je to čtení vždy jednoduché, ale když máte alespoň základní znalosti matematiky a fyziky, jeho vyprávění vám pomůže věci uvést do souvislostí, zasadit je do kontextu a následně porozumět i složitějším konstrukcím. Za mě jednoznačně kniha, která má v mé knihovně svoje nezastupitelné místo.
Profile Image for Logan.
107 reviews1 follower
November 1, 2017
Intriguing topics and Dr. Kaku is one of the few people who writes for the science enthusiast. Lot of information here. However, it was not conveyed in terms understandable for the general reader. Multitude of topics discussed without ever being broken down as to why I should care or what that means in terms I can relate to. Good book for someone well versed in mathematics or physics. I enjoy the topics discussed, but they need to be broken down in a way in which anyone could understand and relate to.
Profile Image for Ivan Quintero Santacruz.
83 reviews6 followers
November 4, 2018
Una lectura muy reveladora. Tal vez en un lenguaje no del todo sencillo, pero está lejos de ser complicado. Deja las fórmulas y ecuaciones atrás y nos deja entrever el mundo de la física, desde el punto de vista de un gran físico.

Me gustó mucho, y sobretodo, aprendí bastante.
Profile Image for Aloha.
133 reviews360 followers
May 7, 2010
Michio Kaku did a terrific job of explaining to the layman scientific possibilities often depicted in sci-fi.
Profile Image for Brianna Silva.
Author 3 books110 followers
December 3, 2019
This is the first "hardcore" science book I've ever read, after wetting my appetite on The Universe In Your Hands and Astrophysics For People In a Hurry, and needing to dive deeper into these topics.

This book did not disappoint! It's a bit dated, as it was written in the 1990s, but I wanted to start with some of Kaku's earliest works to get a solid foundation of the concepts in here, before moving to his more recent books.

Hyperspace has left my mind buzzing with possibilities, with the wonder of the universe, as it took me through concepts like quantum physics, string theory, and higher dimensions.

This has been rewarding as a theoretical physics fan, and inspiring as a science fiction writer.

I'm excited to read Kaku's next book. It's already sitting on my shelf! 😌

This was my first hardcore science book, but it definitely won't be the last. :)))
Profile Image for Lee.
170 reviews
June 24, 2018
“According to string theory, if we could somehow magnify a point particle, we would actually see a small vibrating string. In fact, according to this theory, matter is nothing but the harmonies created by this vibrating string. Since there are an infinite number of harmonies that can be composed for the violin, there are an infinite number of forms of matter that can be constructed out of vibrating strings. This explains the richness of the particles in nature. Likewise, the laws of physics can be compared to the laws of harmony allowed on the string. The universe itself, composed of countless vibrating strings, would then be comparable to a symphony.”
Profile Image for Forgoszel.
214 reviews17 followers
April 30, 2022
Remek könyv volt. Olvasmányos, több helyen humoros. Ha a fizika alapjai megvannak - általános + gimi - teljesen érthető lesz. A megértést, a vizualizációt több ábra és grafikon is segíti. Nagyon egyben lévő könyv ez, csak ajánlani tudom. Magyarul, az Akkor Kiadó gondozásában jelent meg 2006-ban.
Profile Image for Jeremy.
48 reviews
March 30, 2022
This book has been on my shelf for years. I've looked at it and wanted to read it for years. I have always been too intimidated to pick it up. I have always been fascinated by physics , but mathematics always keeps me from jumping in. I barely survived Algebra in college.

If you are reading this and also feel this way, fear not! Kaku does a phenomenal job with this book and keeping the mathematics to a minimum and focusing more on the physical principles. You will get lost at times, concepts will go over your head, but he will bring you back. It is important to note that most of this stuff is over a physicists head as well. So, give it a read. I never once felt so overwhelmed I wanted to stop. I blew through this book much faster than I imagined. Why did I wait so long!?
Profile Image for Libin Varkey.
77 reviews10 followers
February 8, 2023
Book for the science enthusiast who have an issue with mathematical equations, thoroughly entertaining, awakening, unputdownable.
19 reviews
July 19, 2008
It's up there, though not as accessible, as Hawking's "A Brief History of Time" and "The Universe in a Nutshell". Dr. Kaku does spend a considerable time walking the reader through how the theories of space-time and hyperspace arose and some of the historical and more mathematical stuff can be a little dense. However, the book opens really nicely with very vivid and amazing explanations of just how freaky hyperspace can be as well as the implications for the world of physics. The book also ends really well with how hyperspace can tell us something about how the universe will end as well as how it may help us, if we're still around, at that time as well as how to build a time machine and the potential evolution of an intelligent species into one capable of manipulating time and space.

I imagine his other book "Physics of The Impossible" which focuses more on trying to explain with physics for well-known sci-fi concepts would be as good as the beginning and end of this book. However, if you find that kind of topic, theoretical physics, black holes, time travel, 10 dimensional space, then I would recommend this book.
Profile Image for Amet Alvirde.
47 reviews72 followers
January 13, 2014
Ayer no pude parar de leer hasta terminar. Este libro es realmente bueno. Kaku tiene una didáctica bastante agradable y el libro está plagado de explicaciones meditadas para ser lo más sencillas posibles (a pesar de la complejidad de los temas tratados). Es un excelente libro de referencia y descubres datos curiosos que jamás te habrías imaginado.

El único contra es que ahora se encuentra desactualizado porque es pre-higgs y pre-colisionador franco-suizo de hadrones. Así que hay algunas anécdotas, planteamientos y conjeturas que ya perdieron sentido o que ahora son hechos irrefutables. De cualquier forma sigue siendo una gran obra que recomiendo a aquellos curiosos que no se han decidido a navegar en las aguas de la física cuántica. :)
Profile Image for Ricardo Acuña.
128 reviews13 followers
April 9, 2018
One of the most intriguing theories in the modern physics is the probable existence of a multidimensional time-space reality. Matter, space as we know sooner or later will turn to a new paradigm. A good book to think over this possibility
18 reviews3 followers
November 21, 2008
Universes curled up into the size of a pencil eraser???!
Incredible brain food. Who needs religion when the world and its parts just keep going and going and going....?
Profile Image for Sarah .
327 reviews22 followers
June 26, 2020
Michio Kaku versucht in diesem Sachbuch, dem Leser die Entwicklung der Theorien zu höheren Dimensionen, Strings und Quanten näher zu bringen.

Das schöne ist, dass man auf jeder Seite die Begeisterung des Autors über die Kosmologie und deren Theorien spüren kann. Als Leser spürt man gleich selbst ein bisschen Faszination mit. Auch versucht Kaku, die Theorien auf die grundlegenden Prinzipien runterzubrechen, damit sie auch dem Laien verständlich werden.

So interessant ich das Thema auch fand, hatte ich auch einige Probleme mit dem Buch. Die beschriebenen Sachverhalte sind hochkomplex, da wir uns höhere Dimensionen nun mal nicht genau vorstellen können (auch wenn wir sie mathematisch beschreiben können). An einigen Stellen hätte ich mich mehr Ausführungen gewünscht. An anderen Stellen fehlte dann auch eine Erklärung. Dazu waren die komischen Bildchen leider auch nicht immer hilfreich. Das lässt mich dann auch daran zweifeln, ob das Buch für Menschen ohne Affinität zu Naturwissenschaft überhaupt zugänglich ist.
Außerdem bin ich öfter mal über Aussagen gestoplert, die mich persönlich einfach nerven. Er spricht öfter mal von den Menschen als Krönung der Schöpfung der Erde und sagt, dass der Zivilisation, die den Hyperraum versteht, beschreiben und nutzen kann, die Herrschaft über dem Universum gebührt. Auch redet er öfter von der Schöpfung des Universums.
Ich sehe das etwas nüchterner, rede von der Entstehung des Universums, sehe die Menschen sicherlich nicht als Krönung der Schöpfung an, sondern als Produkt der Evolution und hoffe, dass sofern jemand den Hyperraum nutzen kann, er sich nicht gleich einen Thron aus Sternenstaub baut und alle Zivilisationen unterjocht.

Das Buch ist in sehr kurze Abschnitte gegliedert und gepaart mit dem Ton des Autors wirkt es wie eine typische amerikanische Dokumentation an einigen Stellen.

Das Buch hat mir trotzdem einen netten Überblick gegeben und mich mit den vermutlich wichtigsten (oder populärsten) Theorien bekannt gemacht. Und Michio Kakus Begeisterung ist dabei auch auf mich übergegangen - auch wenn ich gerade immer noch ein paar Gehirnwindungen entknoten muss.
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