I was listening to the audiobook while I was doing another task and only stopped when I finished it. So I read it all in one sitting. It's one of those few books that I feel I might read it again someday. I like Stephen's writing, but for some reason I ended up liking '' A brief history of time'' better.

و اتمام اولین کتاب امسال
یکم با تأخیر
اول از همه بذارین اینو بگم که اگه خواستین این کتاب رو بخونید اصلاً اصلاً اصلاً با برگردانِ کوروش زعیم نخونین نمیدونم نسخ دیگه خوب باشن یا نه ولی این یکی به صورت جدی احتیاج به ویراستاری داره
این کتاب به خودیِ خود یه کتاب روون نیست که بگی اوکی حالا یه کاریش میکنم کتاب داره مبحث علمی مطرح میکنه و خوندن مبحث علمی اونم بدون ویراستاری !! دیگه خودتون تصور کنید هر جمله رو باید چند بار بخونید علائم نگارش پس و پیش و نادرست گذاشته شدن

اماااا با وجود همه ی اینا کتاب خوبه دوست داشتنیه هاوکینگ به زبان نسبتاً ساده این کتاب رو نوشته و اینم بگم که این کتاب دنباله ی کتاب تاریخچه ی زمانه که خب من اونو نخوندم ولی خوبه که شما اگه خواستین سراغ خوندن این کتاب برید قبلش اونو مطالعه کنید
نوع نوشتاری هاوکینگ دوست داشتنیه به نظرم همون طور که تو سریال بیگ بنگ تئوری تا حدودی با کاراکترش آشنا شدم که خب آدم باحالی دیده میشه تو این کتاب دیگه بهم ثابت شد که همینطوره چون بعضی از قسمت های کتاب طنز خوبی داره به نظرم

اگر میخواین درباره تئوری نسبیت و تئوری ریسمان و... اطلاعات ابتدایی کسب کنید این کتاب عالیه

در کل از کتاب با تمام کاستی هاش راضی بودم ولی بازم توصیه می کنم شما دنبال یه برگردانِ بهتر از این کتاب باشین

Un libro sencillo y dinámico. Lo disfruté mucho. Se aprende acerca de astronomía, física, universo, mecánica cuántica, viajes en el tiempo y evolución.

Me gustaron mucho los dos primeros capítulos del libro pues en ellos se explican de manera muy breve y sencilla las bases de las dos teorías que revolucionaron la física en el siglo XX, la relatividad y la mecánica cuántica y cómo nos permitieron obtener el conocimiento actual que tenemos del universo. Los demás capítulos son un poco más complicados y técnicos ya que tratan de explicarnos los vacíos que aún quedan en nuestros modelos del universo y cómo ideas como las cuerdas, membranas o supergravedad pueden resolver estos problemas.

It's natural for our minds to wonder beyond the narrow confines of what's known, hence why not take that chance and adhere to your curious streak?!

This illuminating and enlightening book takes one on the most thrilling venture through space and time, wherein extraordinary marvels lie in wait. The true genius of Stephen Hawking is something that cannot fail to surprise, as this book is filled with pages of diagrams and fantastically detailed images. The complexities, excentricities and ideas of such a man is brilliantly captured in every page, therefore you'll never quite regard space and the universe in the same way ever again.

'It's all a matter of where one places themselves in life's continuous timeline'

Here are some of my favourite quotes that I gained inspiration from the book...

What keeps one grounded inevitably is slow in its origin

That which fluctuates in peaks and troughs isn't generally relative to the common norm

'Politics for the moment, but an equation for eternity!' --Albert Einstein

'Nothing puzzles me like time and space. And yet nothing troubles me less than time and space, because i never think of them' --19th century author, Charles Lamb

A scientific theory is a mathematical model that describes and codifies the observations we make. A good theory will describe a large range of phenomena on the basis of a few simple observations and will make definite predictions that can be tested.
--FACT!

Creation is hierachal like Dante's inferno, and we're all sinking with a gravitational pull!

Time travel is possible with a vast imagination!

Does one drift around in various areas (reflection), or move with the time's (progression)?

This book is essential reading for those budding scientists keen to understand more about are universe, as it's packed with fascinating facts from a true legend and clever mind. You may say that there are different expressions to explain the same underlying theory, which is true, however Hawking's is one of the easier to understand and the most informative. The universe in a nutshell guides you on the search to discover those hidden secrets beyond our stratosphere, such as; supersymetry, M-theory, holography and many more while combining other scientists imput. Ideas from Einstein's general theory of relativity, and Richard Feynman's histories are included all in this fantastic compendium of knowledge. I certainly enjoyed reading this book and found it most informative and instructive for my own study purposes.

Next to read:
* A brief history of time
* Black holes and baby universes and other essays

Devo ter entendido algo em torno de 30% deste livro, e já achei sensacional.
Imagino quem consegue entender tudo!

یکی از جذاب ترین و باحال ترین کتاب های علمی فیزیکی بود که خوندم و بسیار لذت بردم ازش. که چنتا از جذاب هاش رو دز زیر میارم:
نسبیت خاص و عام انیشتین
انیشتین در ابتدا میگفت که دلیل اینکه سیب روی سر نیوتن افتاد این بود که نیوتن و سطح زمین به سمت سیب شتاب گرفتند و انیشتین گرانش رو در ابتدا در نظر نگرفت.(که این نظریه نسبت خاص نامیده شد). بعدا انیشتین فهمید که اگر اینطور است که شتاب سطح زمین بسمت بالا باعث میشد که همه مردم به سمت بالا شتاب بگیرند ولی دید اینطور نیست و زمین تخت نیست بلکه گرد است، ‌ پس آمد گفت که باید فضازمان پیچ و تاب بخورد و گرانش را به خمیدگی فضا زمان ربط داد ، یعنی این میدان گرانشی است که باعث خمیده شدن فضا زمان میگردد.که این نظریه نسبیت عام نام گرفت.

سفر در زمان
هاوکینگ میگه: یسری حلقه هایی تو زمان داریم که به حلقه های زمان معروفند یعنی جاهایی که بشه تو اونجاها با سرعت کمتر از نور حرکت کرد. و ویژگی این حلقه های زمان اینه که میشه تو اونها تو زمان سفر کرد. این از قسمت اثبات فیزیکیش، ولی تو عمل به دلیل پیچ و تاب فضا زمان(نظریه نسبت عام انیشتین) که اجازه ایجاد چنین حلقه هایی رو نمیده، پس در کل سفر در زمان در عمل کار محالی میشه و نیز در فیزیک چیزی داریم به اسمه ریسمان های کیهانی که تو خود این ریسمان ها سفر، بخصوص سفر به گذشته امکان پذیر نیست چون حلقه زمانی رو دربرنمیکیرن ولی اگه بشه فضاهای ریسمانی کیهانی پیدا کرد سفر به گذشته ممکنه که این کارم تقریبا محاله چون ویژگی این فضاها باید این باشه که بشه تو اونها با سرعت بیشتری از سرعت نور حرکت کرد که محاله:).

اشتباه انیشتین در مورد زمین یا جهان
انیشتین:جهان اینستاست بدون مبدا.
درحالی که بعدا اثبات شد که جهان یا با منقبض شدن و یا با بزرگ شدنش پایان خواهد یافت(بستگی به ماده و انرژی دارد.)

فرضیه های پایان جهان
فرضیه های پایان جهان:یک اینکه اگر چگالی جهان از یک مقدار بحرانی بیشتر باشد، آنگاه در این حالت کشش گرانشی بین کهکشانها بیشتر شده و حرکت آنها را کند و درنهایت آنان را از دور شدن از هم باز می دارد.که در نهایت همه چی متراکم شده و همه چیز در یک ویرانگر گرانشی مکیده می شوند.
۲- دوم اینکه اگر مقدار چگالی از مقدار بحرانی کمتر باشد،آن گاه کشش گرانشی کمتر از آن است که بتواند از دورشدن کهکشانها نسبت بهم جلوگیری کند و ستارگان رفته رفته سوخت خود را تمام می کنند و در نتیجه در نهایت جهان رفته رفته تهی تر و سردتر می شود و دوباره مانند حالت اول همه چیز به پایان می رسد.اما در دوحالت هم جهان حداقل دو میلیارد سال عمر خواهد داشت.
جهان در پوست گردو

Hồi xem Interstellar cảm thấy vô cùng mãn nhãn, nhưng chẳng có chút kiến thức gì về các hiện tưởng vật lý trong phim :)) nên tóm lại vẫn là chưa cảm nhận được hoàn toàn. Thế là tình cờ được một đứa bạn recomm: đọc quyển này đi, dễ hiểu cực kì. Quyết định đọc quyển này trước khi xem lại phim thêm lần nữa.
Có cảm tưởng như Stephen Hawking viết cuốn sách này không dành cho các nhà vật lí lí thuyết hay các nhà khoa học mà chủ yếu để dành cho những độc giả như mình, những người có hứng thú muốn tìm hiểu về những căn bản của vũ trụ mà trong đầu chưa có chút kiến thức cơ bản nào cả. Ngôn ngữ của ông được sử dụng vô cùng đơn giản, kể cả có thuật ngữ thì cũng được chú giải ở cuối sách để người đọc có thể dễ dàng nắm bắt. Không cầu kì, nhưng vẫn khiến mình cảm thấy choáng ngợp với những kiến thức, những sự thật mà mình chưa từng biết tới, là sự thật mà có vẻ còn khó tin hơn cả những điều hư ảo. Stephen Hawking quả thực đã viết cuốn sách này với tất cả niềm đam mê vật lí trong ông, một giọng văn hài hước đầy cuốn hút. Mình thích nhất là chương sách ông viết về Hố đen, Kì dị Big Bang và Hình dạng của thời gian. Chương đầu thì ngập trong lí thuyết, quả thực là mình cũng chưa đủ trình để ngấm đc :)) có cảm giác nếu ngày xưa chăm học lí hơn thì giờ đọc quyển này sẽ cảm nhận đc nhiều cái hay hơn.

Un libro difícil para mi pues no es mi estilo y sin duda fue una sorpresa pues imaginé que todo sería demasiado difícil de entender.
Hawking logra explicar con ejemplos muy didácticos los diferentes teoremas además de sumas pequeñas cápsulas históricas que logran centrarte en el contexto y captan tu atención para pasar al siguiente teorema.
No sabía qué esperar pero toca temas tan esenciales que me dejaron sorprendida, me hicieron analizar y buscar definiciones.

Por su puesto añade un toque de humor que le da más sabor a lo que parece demasiado difícil entender.
Me dejó reflexionando muchísimo en temas sobre lo que me rodea, lo que implica el estudio de la relatividad, el tiempo y el espacio así como las dimensiones.
Sé que esto es a penas una embarrada de nada de lo que genuinamente se está estudiando pero está bien abrir la mente a lo que es real.

Mucho we decir pero sin duda puedo decir que soñé muchísimas cosas por causas de este libro y ahora me pongo a pensar si este 2025 estaría bien leer más de Hawking

My rating is based on how genius SH is and the innovative and complicated theories he is up to explain to a lay audience. But definitely my choice of media was not wise as getting this information via an audiobook brought my comprehension to less than 50%. If I have the chance to read the illustrated version of the book, I expect to increase my chances of absorbing such fantastic but complicated concepts.

เล่มนี้สุดยอดมากๆๆๆ ขยายขีดความเข้าใจเรื่องจักรวาลแบบหัวระเบิด และสนุกมากถึงมากที่สุด ไม่น่าเบื่อเลยแถมรูปประกอบสวยทั้งเล่มทำให้เราเข้าใจสิ่งที่ฮอว์กิงต้องการจะสื่อ แน่ว่าเข้าใจได้ไม่ถึงครึ่ง (ร้องไห้) แต่ก็ยัง mind blow มากอยู่ดี เป็นครั้งแรกที่เข้าใจเลยว่าทำไมคนเราถึงควรตั้งใจเรียนคณิตและฟิสิกส์ และมันเชื่อมโยงกับปรัชญายังไง ประทับใจมากๆ

ใครที่ชอบซีรี่ย์มาร์เวลหรือดาร์ก หากอยากทำความเข้าใจ multiuniverse หรือการย้อนเวลาเป็นไปได้มากแค่ไหนในความเป็นจริง ต้องเล่มนี้เลยค่ะ ยิ่งอ่านยิ่งทึ่งว่าพวกพี่คนทำหนังทำเรื่องยากๆ ให้สนุกได้ไงนะ ใช่ๆ หมายถึงฮอว์กิงด้วยน่ะ คนอะไรเขียนหนังสือเก่งเป็นบ้า

ปล.รูปในเล่มสวยมาก ถึงบางรูปไม่สวยแต่ก็ทำให้เข้าใจเนื้อหาได้ง่ายขึ้นมากๆ (แม้จะเรียงชวนงงก็ตาม)

About Time Travel
What really sparked my interest in time travel, was the ascension of The Prophet Mohammad, this makes him the first person to have traveled in time through a black hole. The description of a black hole being mentioned explicitly in a Chapter of Qur'an known as Surah Najam
When the stars are extinguished. (Qur'an, 77:8)
[I swear] by Heaven and the Tariq! And what will convey to you what the Tariq is? The Star Piercing [the darkness]! (Qur'an, 86:1-3)
For more visit the link below:
https://www.islamicity.org/3517/some-...
What is real and what is imaginary? Is the distinction just in our minds?
Time must have a beginning in what is called the big bang. Similar arguments show that time would have an end, when stars or galaxies collapse under their own gravity to form black holes.
If one follows our past light cone back in time, it will be bent back by the matter in the early universe. The whole universe we observe is contained within a region whose boundary shrinks to zero at the big bang. This would be a singularity, a place where the density of matter would be infinite and classical general relativity would break down.
While 10 or 11 dimensions don’t sound much like the spacetime we experience, the idea was that the other 6 or 7 dimensions are curled up so small that we don't notice them; we are only aware of the remaining 4 large and nearly flat dimensions.
String theories are not of much use for describing how the energy of a very large number of particles curves the universe or forms a bound state, like a black hole. For these situations, one needs supergravity, which is basically Einstein's theory of curved spacetime with some extra kinds of matter.
Spooky
The area formula for the entropy—or number of internal states—of a black hole suggests that information about what falls into a black hole may be stored like that on a record, and played back as the black hole evaporates.
Amazing>The most obvious thing about space is that it goes on and on and on. This has been confirmed by modern instruments such as the Hubble telescope, which allows us to probe deep into space. What we see are billions and billions of galaxies of various shapes and sizes. Each galaxy contains uncounted billions of stars, many of which have planets around them. We live on a planet orbiting a star in an outer arm of the spiral Milky Way galaxy.
Hubble
It was Hubble who recognized the dramatic implications of this discovery: on the large scale, every galaxy is moving away from every other galaxy. The universe is expanding.
It came as a total surprise, and it completely changed the discussion of the origin of the universe. If the galaxies are moving apart, they must have been closer together in the past. From the present rate of expansion, we can estimate that they must have been very close together indeed ten to fifteen billion years ago.
THE BIG BANG
Einstein's general theory of relativity implied that the universe and time itself must have had a beginning in a tremendous explosion.
When the universe is big, as it is today, there are a very large number of rolls of the dice, and the results average out to something one can predict. That is why classical laws work for large systems. But when the universe is very small, as it was near in time to the big bang, there are only a small number of rolls of the dice, and the uncertainty principle is very important.
The human race does not have a very good record of intelligent behavior.
Endless Possibilities
There seem to be various possibilities, depending on the amount of matter in the universe. If there is more than a certain critical amount, the gravitational attraction between the galaxies will slow them down and will eventually stop them from flying apart. They will then start falling toward each other and will all come together in a big crunch that will be the end of the history of the universe in real time.
If the density of the universe is below the critical value, gravity is too weak to stop the galaxies from flying apart forever. All the stars will burn out, and the universe will get increasingly emptier and colder. So, again, things will come to an end, but in a less dramatic way.
When Copernicus and Galileo discovered that the planets orbit the Sun rather than the Earth, and Newton discovered the laws that govern their motion, astrology became extremely implausible. Why should the positions of other planets against the background sky as seen from Earth have any correlations with the macromolecules on a minor planet that call themselves intelligent life
Absolute time defied
In 1905, the concept of absolute time was overthrown by the special theory of relativity, in which time was no longer an independent quantity on its own but was just one direction in a four-dimensional continuum called spacetime.
Dark Stars
Michell argued that there could be stars that are much more massive than the Sun and have escape velocities greater than the speed of light. We would not be able to see these stars, because any light they sent out would be dragged back by the gravity of the star. Thus they would be what Michell called dark stars and we now call black holes.
The radiation from a black hole will carry away energy, which must mean that the black hole will lose mass and get smaller. In turn, this will mean that its temperature will rise and the rate of radiation will increase. Eventually the black hole will get down to zero mass. We don't know how to calculate what happens at this point, but the only natural, reasonable outcome would seem to be that the black hole disappears completely. So what happens then to the part of the wave function inside the black hole and the information it contains about what had fallen into the black hole?
However, according to the picture of one member of a virtual-particle pair falling in and the other member escaping, one would not expect the escaping particle to be related to what fell in, or to carry away information about it. So the only answer would seem to be that the information in the part of the wave function inside the black hole gets lost
P-branes
Andrew Strominger and Cumrun Vafa made an important advance. They chose to regard a black hole as being made up of a number of building blocks, called p-brane . Recall that one way of thinking about p-branes is as sheets that move through the three dimensions of space and also through seven extra dimensions that we don't notice.
Does part of the wave function get lost down black holes, or does all the information get out again, as the p-brane model suggests? This is one of the outstanding questions in theoretical physics today.
WORMHOLES
But you might go through a wormhole to the other side of the galaxy and be back in time for dinner. However, one can show that if wormholes exist, you could also use them to get back before you set out. So you might think that you could do something like blowing up the rocket on its launch pad to prevent your setting out in the first place. This is a variation of the grandfather paradox: what happens if you go back and kill your grandfather before your father was conceived?
At present our computers remain outstripped in computational power by the brain of a humble earthworm.
The brain does not have a single CPU— central processing unit—that processes each command in sequence. Rather, it has millions of processors working together at the same time. Such massively parallel processing will be the future for electronic intelligence as well.
The human race has been in its present form for only two million years out of the fifteen billion years or so since the big bang
A shocking reality check!
Many of us may choose to live a virtual existence? Forming cyber-friendships and relationships!
Funniest revelation
It is not clear that intelligence has much survival value. Bacteria do very well without intelligence and will survive us if our so-called intelligence causes us to wipe ourselves out in a nuclear war. So as we explore the galaxy we may find primitive life, but we are not likely to find beings like us.
To the naked eye a hair looks like a line; its only dimension appears to be length. Similarly, spacetime may look four-dimensional to us, but appear ten- or eleven-dimensional when probed with very high-energy particles.