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Stephen Hawking

 
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Stephen Hawking, Physicist

Stephen Hawking
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  • Born: 8 January 1942
  • Birthplace: Oxford, England
  • Best Known As: The author of A Brief History of Time

Stephen Hawking is considered the world's foremost living theoretical physicist. He's an expert on black holes whose stated intention is to unify quantum mechanics with Einstein's general theory of relativity, forming a single theory to explain the origin (and end) of the universe. Hawking, a professor of mathematics at Cambridge University, is the author of the best-selling book A Brief History of Time and something of a celebrity: he has made guest appearances on the TV shows Star Trek and The Simpsons. Hawking has suffered from ALS (amyotrophic lateral sclerosis, also called Lou Gehrig's disease) since he was a young man and is confined to a wheelchair. He held the celebrated post of Lucasian Professor of Mathematics at Cambridge from 1979 until his retirement in 2009.

According to Hawking's own site, the Lucasian Chair at Cambridge "was founded in 1663 with money left in the will of the Reverend Henry Lucas, who had been the Member of Parliament for the University. It was first held by Isaac Barrow, and then in 1663 by Isaac Newton."

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Wiley Book of Astronomy:

Stephen William Hawking

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(1942–)

An English theoretical astrophysicist and cosmologist famed almost equally for his work on black holes and the origin of the universe (propagated to a vast lay audience through his nontechnical books, including A Brief History of Time and The Universe in a Nutshell) and the fact that he has survived for four decades with motor neuron disease, an affliction with which he was diagnosed as a postgraduate at Oxford. Since 1980 he has held the Lucasian Chair of Mathematics at Cambridge University. He supplied a mathematical proof, along with Brandon Carter, W. Israel and D. Robinson, of John Wheeler's “No-Hair Theorem”—namely, that any black hole is fully described by the three properties of mass, angular momentum, and electric charge. He also showed that black holes, especially tiny ones, can effectively evaporate as a result of the production of particle-antiparticle pairs in their vicinity (see Hawking radiation). Together with Ian Moss, he has derived a “no-boundary” solution for the origin of space and time in the Big Bang.
Britannica Concise Encyclopedia:

Stephen William Hawking

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(born Jan. 8, 1942, Oxford, Oxfordshire, Eng.) English theoretical physicist. He studied at the University of Oxford and later received his Ph.D. from Cambridge. He has worked primarily in the field of general relativity and particularly on the physics of black holes. In 1971 he suggested that numerous objects, formed after the big bang, each had as much as one billion tons of mass but the size of only a proton. These "mini black holes" are unique in being subject to both the laws of relativity, due to their immense mass and gravity, and the laws of quantum mechanics, due to their minute size. In 1974 he proposed that black holes "evaporate" by what is now known as Hawking radiation. His work greatly spurred efforts to delineate the properties of black holes. His work also showed the relationship of these properties to the laws of classical thermodynamics and quantum mechanics. Hawking's achievements, despite near-total paralysis from amyotrophic lateral sclerosis, have earned him extraordinary honours. His books include the best-selling A Brief History of Time (1988).

For more information on Stephen William Hawking, visit Britannica.com.

[b. Oxford, England, January 8, 1942]

In 1974 Hawking calculated that black holes emit a form of energy now known as Hawking radiation. Since then he has analyzed the shape and fate of the universe in technical studies and popular books. Although Hawking has been afflicted with severe progressive muscle degeneration since the early 1960s, he manages with the use of a speech synthesizer to continue as Lucasian professor of mathematics at Cambridge University (since 1979), the chair once held by Isaac Newton.


Gale Encyclopedia of Biography:

Stephen William Hawking

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The theories of British physicist and mathematician Stephen William Hawking (born 1942) placed him in the great tradition of Newton and Einstein. Hawkingmade fundamental contributions to the science of cosmology - the study of the origins, structure, and space-time relationships of the universe.

Stephen W. Hawking was born on January 8, 1942, in Oxford, England. His father, a well-known researcher in tropical medicine, urged his son to seek a career in the sciences. Stephen found biology and medicine too descriptive and lacking in exactness. Therefore, he turned to the study of mathematics and physics.

Hawking was not an outstanding student at St. Alban's School, Hertfordshire, nor later at Oxford University, which he entered in 1959. He was a sociable young man who did little schoolwork because he was able to grasp the essentials of a mathematics or physics problem quickly and intuitively. While at Oxford he became increasingly interested in relativity theory and quantum mechanics, eventually graduating with a first class honors in physics (1962). He immediately began post-graduate studies at Cambridge University.

The onset of Hawking's graduate education at Cambridge marked a turning point in his life. It was then that he embarked upon the formal study of cosmology that focused his intellectual energies in a way that they had never been previously. And it was then that he was first stricken with amyotrophic lateral sclerosis (Lou Gehrig's disease), a debilitating neuromotor disease that eventually led to his total confinement to a wheelchair and to a virtual loss of his speech functions. At Cambridge his talents were recognized by his major professor, the cosmologist Dennis W. Sciama, and he was encouraged to carry on his studies despite his growing physical disabilities. His marriage in 1965 to Jane Wilde was an important step in his emotional life. Marriage gave him, he recalled, the determination to live and make professional progress in the world of science. Hawking received his doctorate degree in 1966 and began his life-long research and teaching association with Cambridge University.

Hawking made his first major contribution to science with his theorem of singularity, a work which grew out of his collaboration with theoretician Roger Penrose. A singularity is a place in either space or time at which some quantity becomes infinite. Such a place is found in a black hole, the final stage of a collapsed star, where the gravitational field has infinite strength. Penrose proved that a singularity was not a hypothetical construct; it could exist in the space-time of a real universe.

Drawing upon Penrose's work and on Einstein's General Theory of Relativity, Hawking demonstrated that our universe had its origins in a singularity. In the beginning all of the matter in the universe was concentrated in a single point, making a very small but tremendously dense body. Ten to twenty billion years ago that body exploded in a big bang which initiated time and the universe. Hawking was able to bring current astrophysical research to support the big bang theory of the origin of the universe and refute the rival steady-state theory.

Hawking's research into the cosmological implications of singularities led him to study the properties of the bestknown singularity: the black hole. Although a black hole is a discontinuity in space-time, its boundary, called the event horizon, can be detected. Hawking proved that the surface area of the event horizon of a black hole could only increase, not decrease, and that when two black holes merged the surface area of the new hole was larger than the sum of the two original surface areas. Working in concert with B. Carter, W. Israel, and D. Robinson, Hawking was also able to prove the "No Hair Theorem" first proposed by physicist John Wheeler. According to this theorem, mass, angular momentum, and electric charge were the sole properties conserved when matter entered a black hole.

Hawking's continuing examination of the nature of black holes led to two important discoveries. The first of them, that black holes can emit thermal radiation, was contrary to the claim that nothing could escape from a black hole. The second concerned the size of black holes. As originally conceived, black holes were immense in size because they were the end result of the collapse of gigantic stars. Using quantum mechanics to study particle interaction at the subatomic level, Hawking postulated the existence of millions of mini-black holes. These were formed by the force of the original big bang explosion.

Hawking summarized his scientific interests as "gravity - on all scales, " from the realm of galaxies at one extreme to the subatomic at the other extreme. In the 1980s Hawking worked on a theory that Einstein unsuccessfully searched for in his later years. This is the famous unified field theory that aims to bring together quantum mechanics and relativity in a quantum theory of gravity. A complete unified theory encompasses the four main interactions known to modern physics: the strong nuclear force, which operates at the subatomic level; electromagnetism; the weak nuclear force of radioactivity; and gravity. The unified theory would account for the conditions which prevailed at the origin of the universe as well as for the existing physical laws of nature. When humans develop the unified field theory, said Hawking, they will "know the mind of God."

As his physical condition grew worse Hawking's intellectual achievements increased. Not content with causing a revolution in cosmology, he presented a popular exposition of his ideas in A Brief History of Time: From the Big Bang to Black Holes. First published in 1988, this book acquired great popularity in the United States. It sold over a million copies and was listed as the best-selling nonfiction book for over a year.

In 1993 Hawking wrote Black Holes and Baby Universes and Other Essays, which, in addition to a discussion of whether elementary particles that fall into black holes can form new, "baby" universes separate from our own, contains chapters about Hawking's personal life. He co-authored a book in 1996 with Sir Roger Penrose titled The Nature of Space and Time, which is based on a series of lectures and a final debate by the two authors. Issues discussed in this book include whether the universe has boundaries and if it will continue to expand forever. Hawking says yes to the first question and no to the second, while Penrose argues the opposite. Hawking joined Penrose again the following year, as well as Abner Shimony and Nancy Cartwright, in the creation of another book, The Large, the Small, and the Human Mind (1997). In this collection of talks given as Cambridge's 1995 Tanner Lectures on Human Values, Hawking and the others respond to Penrose's thesis on general relativity, quantam physics, and artificial intelligence.

Hawking's work in modern cosmology and in theoretical astronomy and physics was widely recognized. He became a fellow of the Royal Society of London in 1974 and five years later was named to a professorial chair once held by Sir Isaac Newton: Lucasian professor of mathematics, Cambridge University. Beyond these honors he earned a host of honorary degrees, awards, prizes, and lectureships from the major universities and scientific societies of Europe and America. These included the Eddington Medal of the Royal Astronomical Society, in 1975; the Pius XI Gold Medal, in 1975; the Maxwell Medal of the Institute of Physics, in 1976; the Albert Einstein Award of the Lewis and Rose Strauss Memorial Fund (the most prestigious award in theoretical physics), in 1978; the Franklin Medal of the Franklin Institute, in 1981; the Gold Medal of the Royal Society, in 1985; the Paul Dirac Medal and Prize, in 1987; and the Britannica Award, in 1989. By the last decade of the 20th century Stephen Hawking had become one of the best-known scientists in the world.

Hawking's endeavors include endorsing a wireless connection to the internet produced by U.S. Robotics Inc., beginning in March 1997, and speaking to wheelchair-bound youth. In addition, Hawking made an appearance on the television series Star Trek that his fans will not soon forget.

Hawking does not readily discuss his personal life, but it is generally know that he was divorced from his first wife in 1991 and they have two sons and a daughter.

When asked about his objectives, Hawking told Robert Deltete of Zygon in a 1995 interview, "My goal is a complete understanding of the universe, why it is as it is and why it exists at all."

Further Reading

Stephen W. Hawking's work can best be approached by reading his books, which include Is the End in Sight for Theoretical Physics (1980); A Brief History of Time (1988); and Black Holes and Baby Universes and Other Essays; Sources on Hawking and his work include John Boslough, Stephen Hawking's Universe (1985); Alan Lightman and Roberta Brower, editors, Origins: The Lives and Worlds of Modern Cosmologists (1990); Michael Harwood, "The Universe and Dr. Hawking, " New York Times Magazine (January 1983); Elizabeth Devine, et al., editors, Thinkers of the Twentieth Century (1983); David Blum, "The Time Machine, " New York (October 1988); Kitty Ferguson, Stephen Hawking: A Quest for a Theory of the Universe (1992); Melissa McDaniel, Stephen Hawking: Physicist (1994); Harry Henderson, Stephen Hawking (1995). See also Russ Sampson, "Two Hours with Stephen Hawking, " Astronomy (March 1993); Publishers Weekly (February 12, 1996; March 10, 1997); Michael Lemonick, "Hawking Gets Personal, " Time (September 27, 1993); and Robert J. Deltete, "Hawking on God and Physical Theory, " Zygon (December 1995); Stephen Hawking also has his own web page at http://www.darntp.carn.ac.uk/user/hawking/home.html.

Answer of the Day:

Stephen Hawking

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Stephen Hawking  
Stephen Hawking
Stephen Hawking, the author of A Brief History of Time and The Universe in a Nutshell, turns 64 today. One of the world's leading theoretical physicists, Hawking has specialized in the study of black holes, the Big Bang and the universe. With his concept of Hawking radiation, he first showed how gravity, quantum mechanics and thermodynamics are related. In spite of his severe physical disabilities due to ALS, Hawking continues to teach as the Lucasian professor of mathematics at the University of Cambridge.

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From our Archives: Today's Highlights, January 8, 2006

Columbia Encyclopedia:

Stephen William Hawking

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Hawking, Stephen William, 1942-, British theoretical physicist, b. Oxford, England, grad. University College, Oxford, 1962, Ph.D. Trinity Hall, Cambridge, 1966. In 1962 Hawking was diagnosed as having an incurable muscular disease, amyotrophic lateral sclerosis (ALS). Although the disease eventually confined him to a wheelchair and forced him to use a computer-generated voice synthesizer to communicate, he continued to teach and to lecture at Cambridge, where he was Lucasian professor of mathematics (1979-2009), and began his research in cosmology. In 1971 Hawking provided mathematical support for the big-bang theory of the origin of the universe; he showed that if the general theory of relativity was correct the universe must have a singularity, or starting point, in space-time.

This cosmological thread led him to the study of black holes and his suggestion that following the big bang primordial, or mini, black holes-objects of immense mass occupying only the space of an elementary particle-were formed. He also showed that the surface area of a black hole can increase but never decrease, that there is a limit on the radiation emitted when black holes collide, and that a single black hole cannot cleave into two black holes. In 1974 Hawking calculated that black holes thermally create and emit subatomic particles until they exhaust their energy and explode. This so-called Hawking radiation linked gravity, quantum mechanics, and thermodynamics mathematically for the first time. Hawking proposed in 1981 that although the universe has no boundary, it is finite in space-time; he collaborated with James Hartle to formulate this mathematically in 1983.

Hawking wrote an explanation of his work that became a popular bestseller, A Brief History of Time: From the Big Bang to Black Holes (1988). He has also published Superspace and Supergravity (1981), The Very Early Universe (1983), Black Holes and Baby Universes and Other Essays (1993), The Nature of Space and Time (1995), and The Grand Design (with L. Mlodinow, 2010).

Bibliography

See M. White, Stephen Hawking: A Life in Science (1992); D. Wilkenson, God, the Big Bang, and Stephen Hawking (1993); M. McDaniel, Stephen Hawking: Revolutionary Physicist (1994).

Science Q&A:

Who is Stephen Hawking?

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Hawking (b. 1943), a British physicist and mathematician, is considered to be the greatest theoretical physicist of the late 20th century. In spite of being severely handicapped by amyotrophic lateral sclerosis (ALS), he has made major contributions to scientific knowledge about black holes and the origin and evolution of the universe though his research into the nature of space-time and its anomalies. For instance, Hawking proposed that a black hole could emit thermal radiation, and he predicted that a black hole would disappear after all its mass has been converted into radiation (called "Hawking's radiation"). A current objective of Hawking is to synthesize quantum mechanics and relativity theory into a theory of quantum gravity. He is also the author of several books, including the popular best-selling work A Brief History of Time.

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Quotes By:

Stephen Hawking

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Quotes:

"It is not clear that intelligence has any long-term survival value."

"It matters if you just don't give up."

Wikipedia on Answers.com:

Stephen Hawking

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Stephen Hawking

Stephen Hawking at NASA, 1980s
Born Stephen William Hawking
8 January 1942 (1942-01-08) (age 70)
Oxford, England, United Kingdom
Residence United Kingdom
Nationality British
Fields Applied mathematics
Theoretical physics
Cosmology
Institutions Cambridge University
California Institute of Technology
Perimeter Institute for Theoretical Physics
Alma mater Oxford University
Cambridge University
Doctoral advisor Dennis Sciama
Other academic advisors Robert Berman
Doctoral students Bruce Allen
Raphael Bousso
Fay Dowker
Malcolm Perry
Bernard Carr
Gary Gibbons
Harvey Reall
Don Page
Tim Prestidge
Raymond Laflamme
Julian Luttrell
Known for Black holes
Theoretical cosmology
Quantum gravity
Hawking radiation
Influences Dikran Tahta
Albert Einstein
Notable awards Wolf Prize (1988)
Prince of Asturias Award (1989)
Copley Medal (2006)
Presidential Medal of Freedom (2009)
Spouse Jane Hawking
(m. 1965–1991, divorced)
Elaine Mason
(m. 1995–2006, divorced)
Signature

Stephen William Hawking, CH, CBE, FRS, FRSA (born 8 January 1942)[1] is a British theoretical physicist and cosmologist, whose scientific books and public appearances have made him an academic celebrity. He is an Honorary Fellow of the Royal Society of Arts,[2] a lifetime member of the Pontifical Academy of Sciences,[3] and in 2009 was awarded the Presidential Medal of Freedom, the highest civilian award in the United States.[4]

Hawking was the Lucasian Professor of Mathematics at the University of Cambridge for 30 years, taking up the post in 1979 and retiring on 1 October 2009.[5][6] He is now Director of Research at the Centre for Theoretical Cosmology in the Department of Applied Mathematics and Theoretical Physics at the University of Cambridge. He is also a Fellow of Gonville and Caius College, Cambridge and a Distinguished Research Chair at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario.[7] He is known for his contributions to the fields of cosmology and quantum gravity, especially in the context of black holes. He has also achieved success with works of popular science in which he discusses his own theories and cosmology in general; these include the runaway best seller A Brief History of Time, which stayed on the British Sunday Times best-sellers list for a record-breaking 237 weeks.[8][9]

Hawking's key scientific works to date have included providing, with Roger Penrose, theorems regarding gravitational singularities in the framework of general relativity, and the theoretical prediction that black holes should emit radiation, which is today known as Hawking radiation (or sometimes as Bekenstein-Hawking radiation).[10]

Hawking has a motor neurone disease that is related to amyotrophic lateral sclerosis, a condition that has progressed over the years and has left him almost completely paralysed.

Contents

Early life

Stephen Hawking was born on 8 January 1942 to Frank Hawking, a research biologist, and Isobel Hawking. He has two younger sisters, Philippa and Mary, and an adopted brother, Edward.[11] Although Hawking's parents were living in North London, they moved to Oxford while his mother was pregnant with Stephen, desiring a safer location for the birth of their first child (London was under attack at the time by the Luftwaffe).[12] According to Hawking, a German V-2 missile struck only a few streets away.[13]

After Hawking was born, the family moved back to London, where his father headed the division of parasitology at the National Institute for Medical Research.[1] In 1950, Hawking and his family moved to St Albans, Hertfordshire, where he attended St Albans High School for Girls from 1950 to 1953 (At that time, boys could attend the Girls' school until the age of ten).[11][12] From the age of eleven, he attended St Albans School, where he was a good, but not exceptional, student.[14] When asked later to name a teacher who had inspired him, Hawking named his mathematics teacher Dikran Tahta.[15] He maintains his connection with the school, giving his name to one of the four houses and to an extracurricular science lecture series.[16] He has visited it to deliver a lecture of his own and has also granted a lengthy interview to pupils working on the school magazine, The Albanian.

Hawking was always interested in science.[14] Inspired by his mathematics teacher, he originally wanted to study the subject at university. However, Hawking's father wanted him to apply to University College, Oxford, where his father had attended. As University College did not have a mathematics fellow at that time, it would not accept applications from students who wished to read that discipline. Hawking therefore applied to read natural sciences, in which he gained a scholarship. Once at University College, Hawking specialised in physics.[12] His interests during this time were in thermodynamics, relativity, and quantum mechanics. His physics tutor, Robert Berman, later said in The New York Times Magazine:

It was only necessary for him to know that something could be done, and he could do it without looking to see how other people did it. ... He didn't have very many books, and he didn't take notes. Of course, his mind was completely different from all of his contemporaries.[14]

Hawking was passing, but his unimpressive study habits[17] resulted in a final examination score on the borderline between first and second class honours, making an "oral examination" necessary. Berman said of the oral examination:

And of course the examiners then were intelligent enough to realize they were talking to someone far more clever than most of themselves.[14]

After receiving his B.A. degree at Oxford in 1962, he stayed to study astronomy. He decided to leave when he found that studying sunspots, which was all the observatory was equipped for, did not appeal to him and that he was more interested in theory than in observation.[14] He left Oxford for Trinity Hall, Cambridge, where he engaged in the study of theoretical astronomy and cosmology.

Career

Almost as soon as he arrived at Cambridge, he started developing symptoms of amyotrophic lateral sclerosis (ALS, known colloquially in the United States as Lou Gehrig's disease), a type of motor neurone disease which would cost him almost all neuromuscular control. During his first two years at Cambridge, he did not distinguish himself, but, after the disease had stabilised and with the help of his doctoral tutor, Dennis William Sciama, he returned to working on his PhD.[14]

Hawking was elected as one of the youngest Fellows of the Royal Society in 1974, was created a Commander of the Order of the British Empire in 1982, and became a Companion of Honour in 1989.[1] Hawking is a member of the Board of Sponsors of the Bulletin of the Atomic Scientists.[18]

In 1974, he accepted the Sherman Fairchild Distinguished Scholar visiting professorship at the California Institute of Technology (Caltech) to work with his friend, Kip Thorne, who was a faculty member there.[1] He continues to have ties with Caltech, spending a month each year there since 1992.[19]

Hawking's achievements were made despite the increasing paralysis caused by the ALS. By 1974, he was unable to feed himself or get out of bed. His speech became slurred so that he could be understood only by people who knew him well. In 1985, he caught pneumonia and had to have a tracheotomy, which made him unable to speak at all. A Cambridge scientist built a speech generating device that enabled Hawking to write onto a computer with small movements of his body, and then have a voice synthesiser speak what he has typed.[20]

Research fields

Hawking in Cambridge
Hawking with String theorists David Gross and Edward Witten

Hawking's principal fields of research are theoretical cosmology and quantum gravity.

In the late 1960s, he and his Cambridge friend and colleague, Roger Penrose, applied a new, complex mathematical model they had created from Albert Einstein's theory of general relativity.[21] This led, in 1970, to Hawking proving the first of many singularity theorems; such theorems provide a set of sufficient conditions for the existence of a gravitational singularity in space-time. This work showed that, far from being mathematical curiosities which appear only in special cases, singularities are a fairly generic feature of general relativity.[22]

He supplied a mathematical proof, along with Brandon Carter, Werner Israel and D. Robinson, of John Wheeler's no-hair theorem – namely, that any black hole is fully described by the three properties of mass, angular momentum, and electric charge.

Following analysis of gamma ray emissions, Hawking suggested that after the Big Bang, primordial mini black holes were formed. With Bardeen and Carter, he proposed the four laws of black hole mechanics, drawing an analogy with thermodynamics. In 1974, he calculated that black holes should thermally create and emit subatomic particles, known today as Bekenstein-Hawking radiation, until they exhaust their energy and evaporate.[23]

In collaboration with Jim Hartle, Hawking developed a model in which the universe had no boundary in space-time, replacing the initial singularity of the classical Big Bang models with a region akin to the North Pole: one cannot travel north of the North Pole, as there is no boundary. While originally the no-boundary proposal predicted a closed universe, discussions with Neil Turok led to the realisation that the no-boundary proposal is also consistent with a universe which is not closed.

Along with Thomas Hertog at CERN, in 2006 Hawking proposed a theory of "top-down cosmology," which says that the universe had no unique initial state, and therefore it is inappropriate for physicists to attempt to formulate a theory that predicts the universe's current configuration from one particular initial state.[24] Top-down cosmology posits that in some sense, the present "selects" the past from a superposition of many possible histories. In doing so, the theory suggests a possible resolution of the fine-tuning question: it is inevitable that we find our universe's present physical constants, as the current universe "selects" only those past histories that led to the present conditions. In this way, top-down cosmology provides an anthropic explanation for why we find ourselves in a universe that allows matter and life, without invoking an ensemble of multiple universes.

Hawking's many other scientific investigations have included the study of quantum cosmology, cosmic inflation, helium production in anisotropic Big Bang universes, large N cosmology, the density matrix of the universe, topology and structure of the universe, baby universes, Yang-Mills instantons and the S matrix, anti de Sitter space, quantum entanglement and entropy, the nature of space and time, including the arrow of time, spacetime foam, string theory, supergravity, Euclidean quantum gravity, the gravitational Hamiltonian, Brans-Dicke and Hoyle-Narlikar theories of gravitation, gravitational radiation, and wormholes.

At a George Washington University lecture in honour of NASA's fiftieth anniversary, Hawking theorised on the existence of extraterrestrial life, believing that "primitive life is very common and intelligent life is fairly rare".[25]

Losing an old bet

U.S. President Barack Obama talks with Stephen Hawking in the Blue Room of the White House before a ceremony presenting him and fifteen others the Presidential Medal of Freedom on 12 August 2009. The Medal of Freedom is the nation's highest civilian honour.

Hawking presented a new theory in 2004 about black holes which went against his own long-held belief about their behaviour, thus losing a bet he made with Kip Thorne and John Preskill of Caltech. Classically, it can be shown that information crossing the event horizon of a black hole is lost to our universe, and that thus all black holes are identical beyond their mass, electrical charge and angular velocity (the "no hair theorem"). The problem with this theorem is that it implies the black hole will emit the same radiation regardless of what goes into it, and as a consequence that if a pure quantum state is thrown into a black hole, an "ordinary" mixed state will be returned. This runs counter to the rules of quantum mechanics and is known as the black hole information paradox.[26]

Human spaceflight

At the fiftieth anniversary of NASA in 2008, Hawking gave a keynote speech on the final frontier exhorting and inspiring the space technology community on why we (the human race) explore space.[27]

At the celebration of his sixty-fifth birthday on 8 January 2007, Hawking announced his plan to take a zero-gravity flight in 2007 to prepare for a sub-orbital spaceflight in 2009 on Virgin Galactic's space service. Billionaire Richard Branson pledged to pay all expenses for the latter, costing an estimated £100,000.[28] Stephen Hawking's zero-gravity flight in a "Vomit Comet" of Zero Gravity Corporation, during which he experienced weightlessness eight times, took place on 26 April 2007.[29] He became the first quadriplegic to float in zero-gravity. This was the first time in forty years that he moved freely, without his wheelchair. The fee is normally US$3,750 for 10–15 plunges, but Hawking was not required to pay the fee. Hawking was quoted before the flight saying:

Many people have asked me why I am taking this flight. I am doing it for many reasons. First of all, I believe that life on Earth is at an ever-increasing risk of being wiped out by a disaster such as sudden nuclear war, a genetically engineered virus, or other dangers. I think the human race has no future if it doesn't go into space. I therefore want to encourage public interest in space.[30]

In an interview with The Daily Telegraph, he suggested that space was the Earth's long term hope.[31] He continued this theme at a 2008 Charlie Rose interview.[32]

Existence and nature of extraterrestrial life

Hawking has indicated that he is almost certain that alien life exists in other parts of the universe and presented a mathematical basis for his assumptions. "To my mathematical brain, the numbers alone make thinking about aliens perfectly rational. The real challenge is to work out what aliens might actually be like." He believes alien life not only certainly exists on planets but perhaps even in other places, like within stars or even floating in outer space. He has also warned that a few of these species might be intelligent and threaten Earth.[33] "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans," he said. He has advocated that, rather than try to establish contact, humans should try to avoid contact with alien life forms.[34]

Illness

Hawking on 5 May 2006, during the press conference at the Bibliothèque nationale de France to inaugurate the Laboratory of Astronomy and Particles in Paris and the French release of his work God Created the Integers

Stephen Hawking is severely disabled by a motor neurone disease known as Amyotrophic lateral sclerosis (ALS), sometimes known as Lou Gehrig's disease. Hawking's illness is markedly different from typical ALS because if confirmed, Hawking's case would make for the most protracted case ever documented. A survival for more than ten years after diagnosis is uncommon for ALS; the longest documented durations, other than Hawking's, are 32 and 39 years and these cases were termed benign because of the lack of the typical progressive course.[35]

When he was young, he enjoyed riding horses. At Oxford, he coxed a rowing team, which, he stated, helped relieve his immense boredom at the university. Symptoms of the disorder first appeared while he was enrolled at University of Cambridge; he lost his balance and fell down a flight of stairs, hitting his head. Worried that he would lose his genius, he took the Mensa test to verify that his intellectual abilities were intact.[36] The diagnosis of motor neurone disease came when Hawking was 21, shortly before his first marriage, and doctors said he would not survive more than two or three years. Hawking gradually lost the use of his arms, legs, and voice, and as of 2009 has been almost completely paralysed.[37]

During a visit to the research centre CERN in Geneva in 1985, Hawking contracted pneumonia, which in his condition was life-threatening as it further restricted his already limited respiratory capacity. He had an emergency tracheotomy, and as a result lost what remained of his ability to speak.[38] He has since used an electronic voice synthesiser to communicate.

He describes himself as lucky, despite his disease. Its slow progression has allowed him time to make influential discoveries and has not hindered him from having, in his own words, "a very attractive family".[39] When his wife, Jane, was asked why she decided to marry a man with a three-year life expectancy, she responded, "Those were the days of atomic gloom and doom, so we all had a rather short life expectancy". On 20 April 2009, Cambridge University released a statement saying that Hawking was "very ill" with a chest infection, and was admitted to Addenbrooke's Hospital.[40][41] The following day, it was reported that his new condition was "comfortable" and he would make a full recovery from the infection.[42]

Speech synthesiser

The DECtalk DTC01 voice synthesiser he once used, which has an American English accent, is no longer being produced. Asked why he has still kept the same voice after so many years, Hawking mentioned that he has not heard a voice he likes better and that he identifies with it. Hawking is said to be looking for a replacement since, aside from being obsolete, the synthesiser is both large and fragile by current standards. Although a mid 2009 corporate press release said that he had chosen NeoSpeech's VoiceText speech synthesiser as his new voice,[43] a 30 December 2011 interview with Hawking's technician indicates that he is still using an older synthesiser containing a card "which dates back to the 1980s" and that any upgrade would have to be the same voice, otherwise "it wouldn't be Stephen's voice any more."[44]

In Hawking's many media appearances, he appears to speak fluently through his synthesiser, but in reality, it is a tedious drawn-out process. Hawking's setup uses a predictive text entry system, which requires only the first few characters in order to auto-complete the word, but as he is only able to use his cheek for data entry, constructing complete sentences takes time. His speeches are prepared in advance, but having a live conversation with him provides insight as to the complexity and work involved. During a TED Conference talk, it took him seven minutes to answer a question.[45]

Recognition

Acclaim

On 19 December 2007, a statue of Hawking by renowned late artist Ian Walters was unveiled at the Centre for Theoretical Cosmology, University of Cambridge.[46] In May 2008, the statue of Hawking was unveiled at the African Institute for Mathematical Sciences in Cape Town. The Stephen W. Hawking Science Museum in San Salvador, El Salvador is named in honour of Stephen Hawking, citing his scientific distinction and perseverance in dealing with adversity.[47] Stephen Hawking Building in Cambridge opened on 17 April 2007. The building belongs to Gonville and Caius College and is used as an undergraduate accommodation and conference facility.[48]

Distinctions

Hawking's belief that the lay person should have access to his work led him to write a series of popular science books in addition to his academic work. The first of these, A Brief History of Time, was published on 1 April 1988 by Hawking, his family and friends, and some leading physicists. It surprisingly became a best-seller and was followed by The Universe in a Nutshell (2001). Both books have remained highly popular all over the world. A collection of essays titled Black Holes and Baby Universes (1993) was also popular. His book, A Briefer History of Time (2005), co-written by Leonard Mlodinow, aims to update his earlier works and make them accessible to an even wider audience. In 2007 Hawking and his daughter, Lucy Hawking, published George's Secret Key to the Universe, a children's book focusing on science that has been described as "like Harry Potter, but without the magic." The book includes information on Hawking radiation.

Hawking supports the children's charity SOS Children's Villages UK.[49]

Awards and honours

Personal life

Stephen Hawking being presented by his daughter Lucy Hawking at the lecture he gave for NASA's 50th anniversary

Hawking has stated that he did not see much point in obtaining a doctorate if he were to die soon. Hawking later said that the real turning point was his 1965 marriage to Jane Wilde, a language student.[14]

Jane Hawking (née Wilde), Hawking's first wife, cared for him until 1990 when the couple separated.[1] They had three children: Robert, Lucy, and Timothy.[1] Hawking married his nurse, Elaine Mason (who was previously married to David Mason, the designer of the first version of Hawking's talking computer)[54], in 1995.[1] In October 2006, Hawking filed for divorce from his second wife[55] amid claims by former nurses that she had abused him.[56][57]

In 1999, Jane Hawking published a memoir, Music to Move the Stars, detailing the marriage and its breakdown; in 2010 she published a revised version, Travelling to Infinity, My Life with Stephen.[57] Hawking's daughter, Lucy, is a novelist. Their oldest son, Robert, emigrated to the United States, married, and has a son.[citation needed] After a period of estrangement, Hawking and his first family were reconciled in 2007.[57]

His view on how to live life is to "seek the greatest value of our action".[58]

Hawking was asked about his IQ in a 2004 newspaper interview, and replied, "I have no idea. People who boast about their I.Q. are losers." Yet when asked "Are you saying you are not a genius?", Hawking replied "I hope I'm near the upper end of the range."[59]

Hawking strongly opposed the US-led Iraq War, calling it "a war crime" and "based on lies". In 2004, he personally attended a demonstration against the war in Trafalgar Square, and participated in a public reading of the names of Iraqi war victims.[60][61]

In popular culture

Hawking in 2007, experiencing zero-gravity.

Hawking has played himself on numerous television shows and has been portrayed in many more. He has played himself on a Red Dwarf anniversary special, played a hologram of himself on the episode "Descent" of Star Trek: The Next Generation,[62] appeared in a skit on Late Night with Conan O'Brien, and appeared on the Discovery Channel special Alien Planet.[63] He has also played himself in several episodes of The Simpsons and Futurama, and has had an action figure made of his Simpsons likeness. In 2008, Hawking was the subject of and featured in the documentary series Stephen Hawking, Master of the Universe for Channel 4. In September 2008, Hawking presided over the unveiling of the 'Chronophage' (time-eating) Corpus Clock at Corpus Christi College Cambridge.[64] His actual synthesiser voice was used on parts of the Pink Floyd song "Keep Talking" from the 1994 album The Division Bell, as well as on Turbonegro's "Intro: The Party Zone" on their 2005 album Party Animals, Wolfsheim's "Kein Zurück (Oliver Pinelli Mix)".

Religious views

In his early work, Hawking spoke of "God" in a metaphorical sense, such as in A Brief History of Time: "If we discover a complete theory, it would be the ultimate triumph of human reason—for then we should know the mind of God."[65] In the same book he suggested the existence of God was unnecessary to explain the origin of the universe.[66] His 2010 book The Grand Design and interviews with the Telegraph and the Channel 4 documentary Genius of Britain, clarify that he does "not believe in a personal God".[67] Hawking writes, "The question is: is the way the universe began chosen by God for reasons we can't understand, or was it determined by a law of science? I believe the second." He adds, "Because there is a law such as gravity, the Universe can and will create itself from nothing."[68][69]

His ex-wife, Jane, said during their divorce proceedings that he was an atheist.[70][71] Hawking has stated that he is "not religious in the normal sense" and he believes that "the universe is governed by the laws of science. The laws may have been decreed by God, but God does not intervene to break the laws."[72] In an interview published in The Guardian newspaper, Hawking regarded the concept of Heaven as a myth, stating that there is "no heaven or afterlife" and that such a notion was a "fairy story for people afraid of the dark."[58][65][73]

Hawking contrasted religion and science in 2010, saying: "There is a fundamental difference between religion, which is based on authority, [and] science, which is based on observation and reason. Science will win because it works."[74]

Notable publications

Technical

Popular

Children's fiction

These are co-written with his daughter Lucy.

Films and series

See also

References

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  2. ^ "Honorary Fellows of the Royal Society of Arts". Royal Society for the encouragement of Arts, Manufactures & Commerce. Archived from the original on 5 June 2007. http://web.archive.org/web/20070605160650/http://www.rsa.org.uk/acrobat/honorary_fellows.pdf. Retrieved 25 March 2007. 
  3. ^ Mason, Michael. "Alliance, Many of the greatest minds of science meet regularly in Vatican City to counsel the pope on the hot topics of the day". Discover Magazine (Discover Magazine) (September 2008): 43. 
  4. ^ a b MacAskill, Ewen (13 August 2009). "Obama presents presidential medal of freedom to 16 recipients". guardian.co.uk (London: Guardian News and Media). http://www.guardian.co.uk/world/2009/aug/13/obama-hawking-medal-freedom. 
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  66. ^ "Though A Brief History of Time brings in God as a useful metaphor, Hawking is an atheist" Anthony Burgess, 'Towards a Theory of Everything', The Observer, 29 December 1991, p. 42
  67. ^ Professor Stephen Hawking quotes on God and Religion, Age of the Sage, Retrieved 13 September 2010
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  69. ^ Farmello, Graham (3 September 2010). "Has Stephen Hawking ended the God debate?". The Daily Telegraph (London). http://www.telegraph.co.uk/news/newstopics/religion/7979211/Has-Stephen-Hawking-ended-the-God-debate.html. Retrieved 13 September 2010. 
  70. ^ "Then, in 1999, his former wife published Music To Move The Stars: My Life with Stephen, in which she claimed (... ) her Christian faith clashed with his steadfast atheism; (... ) The last line in A Brief History Of Time is famous for saying that, if we could tie together the equations describing the universe, we would "know the mind of God." But his former wife claims, "He is an atheist. So why is the deity making an appearance? The obvious answer is that it helps sell books." Charles Arthur, 'The Crazy World of Stephen Hawking', The Independent (London), 12 October 2001, Features, p. 7.
  71. ^ "Jane took much of her dramatic hope at the time from her faith, and still sees something of the irony in the fact that her Christianity gave her the strength to support her husband, the most profound atheist. 'Stephen, I hope, had belief in me that I could make everything possible for him, but he did not share my religious—or spiritual—faith.' " Tim Adams, 'A Brief History of a First Wife', The Observer, 4 April 2004, Review Pages, p. 4.
  72. ^ "Pope sees physicist Hawking at evolution gathering | Science". Reuters. 31 October 2008. http://www.reuters.com/article/scienceNews/idUSTRE49U6E220081031?feedType=RSS&feedName=scienceNews. Retrieved 22 May 2009. 
  73. ^ Stephen Hawking: Heaven Is A Myth. Huffingtonpost.com. Retrieved on 2011-08-08.
  74. ^ Heussner, Ki Mae (7 June 2010). "Stephen Hawking on Religion: 'Science Will Win'". ABC News. http://abcnews.go.com/WN/Technology/stephen-hawking-religion-science-win/story?id=10830164. Retrieved 15 October 2011. 
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Bibliography

Further reading

External links


 
 

 

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