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In spite of this, a year-old language student named Jane Wilde fell in love and married him. Not only did the young professor survive, but the couple went on to have three children. Hawking's audacious theoretical physics catapulted him into a fellowship at Gonville and Caius College, and ultimately, one of the loftiest honours in British academics -- the Lucasian chair of mathematics, once occupied by Isaac Newton.

Hawking's profile exploded into popular view with the publication of A Brief History of Time. It was his "ideas on space and time," one chronicler wrote, "and the single, unified 'theory of everything' which led him to make his most famous pronouncement on knowing the mind of God. It was the sheer unfathomableness of his ideas that propelled him to A-list celebrity status.

Another broadcast found him seated at a bar with Homer Simpson, where Prof.

Hawking told the cartoon character that he liked Homer's concept of a doughnut-shaped universe. Hawking visited Bill Clinton at the White House and counted movie stars among his friends. A Brief History of Time sold 25 million copies, and Prof. But while his public life shone, his private life was failing.

In her autobiography, Music to Move the Stars, Jane Hawking described her marriage to an "all-powerful emperor" and a "masterly puppeteer. Emotionally exhausted, Jane began an affair, apparently with Prof.


Hawking's consent. Her lover was a family friend, choirmaster Jonathan Hellyer-Jones. Her husband, David, was the engineer who designed the keyboard-operated device that produces the robotic voice-tones with which Hawking now communicates.

She became Prof.

A Brief History Of Time By (Stephen Hawking) PDF

Hawking's companion, and the two formed a close bond. After Prof. Hawking's rapid ascent to celebrity, Elaine began to accompany the scientist on his frequent travels. According to published accounts, he grew to believe that she was the single person who had his interests most at heart. This conviction turned to infatuation, and finally romance. Jane Hawking grew suspicious.

She told a friend at the time that when she phoned her husband while he was abroad, she was told by Elaine, "How dare you call? This is my personal time with Stephen. Hawking told her in that he was leaving her.

Elaine and Prof. Hawking married in The first rumours that he was being battered surfaced four years ago, when he was admitted to hospital with a broken wrist, black eyes, facial cuts and a torn lip. But Prof. Hawking insisted that he had fallen from his wheelchair, and refused to be interviewed by the Cambridgeshire police. His claim was plausible, as Prof. Hawking is notorious for careering around the streets of Cambridge in his motorized chair. Two years ago, just before his 60th birthday, he ended up in the emergency ward with a broken hip.

Soon after, at a lecture called Sixty Years in a Nutshell, organized by Cambridge to celebrate his birthday, Prof. Hawking joked to his audience, "It was nearly Chris Wilde, brother of Jane who is now married to Mr.

Hellyer-Jones , described an incident he witnessed at a family party three years ago: "I think Elaine thought no one was looking," he told The Sunday Times, "and she grabbed his hair and spun his head around degrees. In the 18th century, Sir William Herschel confirmed the positions and distances of many stars in the night sky. In , Edwin Hubble discovered a method to measure the distance using brightness of the stars. The luminosity , brightness and distance are related by a simple mathematical formula.

Using all these, he fairly calculated distances of nine different galaxies. We live in a spiral galaxy just like other galaxies containing vast numbers of stars. The stars are very far away from us, so we only observe their one characteristic feature, their light.

When this light is passed through a prism, it gives rise to a spectrum. Every star has its own spectrum and since each element has its own unique spectra, we can know a star's composition. We use thermal spectra of the stars to know their temperature.

In , when scientists were examining spectra of different stars, they found that some of the characteristic lines of the star spectrum was shifted towards the red end of the spectrum. The implications of this phenomenon was given by the Doppler effect , and it was clear that some stars were moving away from us. It was assumed that since some stars are red shifted, some stars would also be blue shifted.

When found, none of them were blue shifted. Hubble found that the amount of redshift is directly proportional to relative distance. So, it was clear that the Universe is expanding. Despite this the concept of a static universe persisted until the 20th century. Einstein was so sure of a static universe that he developed ' Cosmological Constant ' and introduced 'anti-gravity' forces to persist with the earlier claim.

Moreover, many astronomers also tried to avoid the face value of General Relativity and stuck with their static universe except one Russian physicist Alexander Friedmann.

Friedmann made two very simple assumptions: the universe is identical in every direction, i. Homogenity and that this would be true wherever we look from, i.

His results showed that the Universe is non-static. His assumptions were later proved when two physicists at Bell's laboratory, Arno Penzias and Robert Wilson found extra microwave radiation noise not only from the one particular part of the sky but from everywhere and by nearly the same amount. Then, Friedmann's first assumption was proved as true. At around the same time, Robert H. Dicke and Jim Peebles were also working on microwave radiation.

They argued that they should be able to see the glow of the early universe as microwave radiations. Wilson and Penzias had already done this, so they were awarded with the Noble Prize in In addition, our place in the Universe is not exceptional, so we should see the universe as the same from any other part of space, which proves Friedmann's second assumption.

Tributo a Stephen Hawking, escena cortada del final de temporada de The Big Bang Theory

His work remained largely unknown until similar models were made by Howard Robertson and Arthur Walker. Friedmann's model gave rise to three different types of model of the universe. First, the universe would expand for a given amount of time and if the expansion rate is less than the density of the universe leading to gravitational attraction , it would ultimately lead to the collapse of the universe at a later stage.

Secondly, the universe would expand and at sometime if the expansion rate and the density of the universe become equal, it would expand slowly and stop at infinite time, leading to a somewhat static universe. Thirdly, the universe would continue to expand forever if the density of the universe is less than the critical amount required to balance the expansion rate of the universe. The first model depicts the space of universe to be curved inwards, a somewhat earth-like structure.

In the second model, the space would lead to a flat structure, and the third model results in negative curvature, or saddle shaped. Even if we calculate, the current expansion rate is more than the critical density of the universe including the dark matter and all the stellar masses.

The first model included the beginning of the universe as a big-bang from a space of infinite density and zero volume known as ' singularity ', a point where General Theory of Relativity Friedmann's solutions are based in it also breaks down.

This concept of the beginning of time was against many religious beliefs, so a new theory was introduced. Its predictions also matched with the current Universe structure. But the fact that radiowave sources near us are far fewer than from the distant universe and there were numerous more radio sources than at present, resulted in failure of this theory and everybody finally supported the Big Bang theory.

Roger Penrose used light cones and General Relativity to prove that a collapsing star could result in a region of zero size and infinite density and curvature called a Black Hole.

Hawking and Penrose proved together that the universe should have arisen from a singularity, which Hawking himself disproved once Quantum effects are taken into account. Chapter 4: The Uncertainty Principle[ edit ] The uncertainty principle says that the speed and the position of a particle cannot be found at the same time.


To find where a particle is, scientists shine light at the particle. If a high frequency light is used, the light can find the position more accurately but the particle's speed will be unknown because the light will change the speed of the particle.

If a lower frequency light is used, the light can find the speed more accurately but the particle's position will be unknown. The uncertainty principle disproved the idea of a theory that was deterministic, or something that would predict everything in the future.

Here is a picture of a light wave. How light behaves is also talked more about in this chapter. Some theories say that light acts like particles even though it really is made of waves; one theory that says this is Planck's quantum hypothesis. A different theory also says that light waves also act like particles; a theory that says this is Heisenberg's uncertainty principle.

Light interference causes many colors to appear. Light waves have crests and troughs. The highest point of a wave is the crest, and the lowest part of the wave is a trough.

Sometimes more than one of these waves can interfere with each other - the crests and the troughs line up. This is called light interference. When light waves interfere with each other, this can make many colors. An example of this is the colors in soap bubbles. Chapter 5: Elementary Particles and Forces of Nature[ edit ] Quarks and other elementary particles are the topic of this chapter.

Quarks are very small things that make up everything we see matter. There are six different "flavors" of quarks: the up quark, down quark, strange quark, charmed quark, bottom quark, and top quark. Quarks also have three "colors": red, green, and blue. There are also anti-quarks, which are the opposite of the regular quarks. In total, there are 18 different types of regular quarks, and 18 different types of anti quarks. Quarks are known as the "building blocks of matter" because they are the smallest thing that make up all the matter in the universe.

A particle of spin 1 needs to be turned around all the way to look the same again, like this arrow. All particles for example, the quarks have something called spin. The spin of a particle shows us what a particle looks like from different directions.

For example, a particle of spin 0 looks the same from every direction. A particle of spin 1 looks different in every direction, unless the particle is spun completely around degrees. Hawking's example of a particle of spin 1 is an arrow. A particle of spin two needs to be turned around halfway or degrees to look the same. The example given in the book is of a double-headed arrow. All of these particles follow the Pauli exclusion principle.

Pauli's exclusion principle says that particles cannot be in the same place or have the same speed. If Pauli's exclusion principle did not exist, then everything in the universe would look the same, like a roughly uniform and dense "soup". This is a proton. It is made up of three quarks. All the quarks are different colors because of confinement. Particles with a spin of 0, 1, or 2 move force from one particle to another.

Some examples of these particles are virtual gravitons and virtual photons. Virtual gravitons have a spin of 2 and they represent the force of gravity. This means that when gravity affects two things, gravitons move to and from the two things. Virtual photons have a spin of 1 and represent electromagnetic forces or the force that holds atoms together. Besides the force of gravity and the electromagnetic forces, there are weak and strong nuclear forces.

Weak nuclear forces are the forces that cause radioactivity , or when matter emits energy. Strong nuclear forces are the forces that keep the quarks in a neutron and a proton together, and keeps the protons and neutrons together in an atom. The particle that carries the strong nuclear force is thought to be a gluon. The gluon is a particle with a spin of 1. The gluon holds together quarks to form protons and neutrons. However, the gluon only holds together quarks that are three different colors.

This makes the end product have no color. This is called confinement. Some scientists have tried to make a theory that combines the electromagnetic force, the weak nuclear force, and the strong nuclear force. This theory is called a grand unified theory or a GUT. This theory tries to explain these forces in one big unified way or theory. Chapter 6: Black Holes[ edit ] A picture of a black hole and how it changes light around it.

Black holes are talked about in this chapter. Black holes are stars that have collapsed into one very small point. This small point is called a singularity. Black holes suck things into their center because they have very strong gravity. Some of the things it can suck in are light and stars. Only very large stars, called super-giants, are big enough to become a black hole. The star must be one and a half times the mass of the sun or larger to turn into a black hole.

This number is called the Chandrasekhar limit. If the mass of a star is less than the Chandrasekhar limit, it will not turn into a black hole; instead, it will turn into a different, smaller type of star. The boundary of the black hole is called the event horizon. If something is in the event horizon, it will never get out of the black hole.

Black holes can be shaped differently. Some black holes are perfectly spherical - like a ball. Other black holes bulge in the middle. Black holes will be spherical if they do not rotate.

Black holes will bulge in the middle if they rotate. Black holes are difficult to find because they do not let out any light. They can be found when black holes suck in other stars. When black holes suck in other stars, the black hole lets out X-rays , which can be seen by telescopes.

In this chapter, Hawking talks about his bet with another scientist, Kip Thorne. Hawking bet that black holes did not exist, because he did not want his work on black holes to be wasted. He lost the bet. Hawking realized that the event horizon of a black hole could only get bigger, not smaller. The area of the event horizon of a black hole gets bigger whenever something falls into the black hole.

He also realized that when two black holes combine, the size of the new event horizon is greater than or equal to the sum of the event horizons of the two original black holes. This means that a black hole's event horizon can never get smaller. Disorder, also known as entropy , is related to black holes. There is a scientific law that has to do with entropy.

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This law is called the second law of thermodynamics , and it says that entropy or disorder will always increase in an isolated system for example, the universe.

The relation between the amount of entropy in a black hole and the size of the black hole's event horizon was first thought of by a research student Jacob Bekenstein and proven by Hawking, whose calculations said that black holes emit radiation.

This was strange, because it was already said that nothing can escape from a black hole's event horizon. This problem was solved when the idea of pairs of "virtual particles" was thought of. One of the pair of particles would fall into the black hole, and the other would escape. This would look like the black hole was emitting particles. This idea seemed strange at first, but many people accepted it after a while.In the second model, the space would lead to a flat structure, and the third model results in negative curvature, or saddle shaped.

The first person to present a detailed arguments that the earth revolves around the sun was the Polish priest Nicholas Copernicus , in Hawking would like to see that eventually everybody would one day talk about these theories in order to understand the true origin and nature of the Universe, accomplishing the ultimate triumph of human reasoning.

Todas estas preguntas, quiero decir estas dificiles preguntas son realmente comunes pero nadie ha podido responderlas. It was assumed that, since some stars are red shifted, some stars would also be blue shifted.

These waves happen in imaginary time. When the universe starts getting bigger, the things inside of it also begin to get cooler.

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