Stephen Hawking dead at 76

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Obituary: Stephen Hawking

http://www.bbc.com/news/science-environment-15555565

31 minutes ago

Stephen Hawking - who died aged 76 - battled motor neurone disease to become one of the most respected and best-known scientists of his age.

A man of great humour, he became a popular ambassador for science and was always careful to ensure that the general public had ready access to his work.

His book A Brief History of Time became an unlikely best-seller although it is unclear how many people actually managed to get to the end of it.

He appeared in a number of popular TV shows and lent his synthesised voice to various recordings.

Stephen William Hawking was born in Oxford on 8 January 1942. His father, a research biologist, had moved with his mother from London to escape German bombing.

Hawking grew up in London and St Albans and, after gaining a first-class degree in physics from Oxford, went on to Cambridge for postgraduate research in cosmology.

He was diagnosed with motor neurone disease while at university

As a teenager he had enjoyed horse-riding and rowing but while at Cambridge he was diagnosed with a form of motor neurone disease which was to leave him almost completely paralysed.

As he was preparing to marry his first wife, Jane, in 1964 his doctors gave him no more than two or three years of life.

But the disease progressed more slowly than expected. The couple had three children, and in 1988 - although Hawking was by now only able to speak with a voice synthesiser following a tracheotomy - he had completed A Brief History of Time - a layman's guide to cosmology.

It sold more than 10 million copies, although its author was aware that it was dubbed "the most popular book never read".
Celebrity

Hawking discovered the phenomenon which became known as Hawking radiation, where black holes leak energy and fade to nothing. He was renowned for his extraordinary capacity to visualise scientific solutions without calculation or experiment.

But it was perhaps his "theory of everything", suggesting that the universe evolves according to well-defined laws, that attracted most attention.

"This complete set of laws can give us the answers to questions like how did the universe begin," he said. "Where is it going and will it have an end? If so, how will it end? If we find the answers to these questions, we really shall know the mind of God."

He believed the universe evolves according to well-defined laws

Hawking's celebrity status was acknowledged even by The Simpsons - he was depicted drinking at a bar with Homer, suggesting he might steal Homer's idea that the universe is shaped like a doughnut.

He also appeared as himself in an episode of the BBC comedy series, Red Dwarf and as a hologram of his image in Star Trek: The Next Generation.

The rock group Pink Floyd used his distinctive synthesised voice for the introduction to Keep Talking, on their 1994 album The Division Bell.

Undeterred by his condition, he continued his work as Lucasian Professor of Mathematics at Cambridge University, and in 2001, his second book - Universe in a Nutshell - was published.

Erratic

He believed his illness brought some benefits; he said before he developed the disease he had been bored with life.

But his condition inevitably made him dependent on others. He often paid tribute to his wife, who had looked after him for more than 20 years, and friends and relatives were shocked when he left her for one of his nurses, whom he married in 1995.

By 2000, Hawking was a frequent visitor to the emergency department of Addenbrooke's Hospital in Cambridge, seeking treatment for a variety of injuries. Police questioned several people about allegations that he had been subjected to verbal and physical abuse over a period of years.

He was known to be an erratic, almost reckless driver of his electric wheelchair, and Hawking insisted his injuries were not caused by abuse.

No action was taken.

In 2007, he became the first quadriplegic to experience weightlessness on board the so-called "vomit comet", a modified plane specially designed to simulate zero gravity. He said he did it to encourage interest in space travel.

"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."

In 2014, the film The Theory of Everything was released, based on Jane Hawking's account of their courtship and marriage. Hawking himself met Eddie Redmayne as part of the actor's preparation for taking on the role of the scientist.

In a series for the Discovery Channel, he said it was perfectly rational to assume there was intelligent life elsewhere but warned that aliens might just raid earth of its resources and then move on.

He once wrote that he had motor neurone disease for practically all his adult life but said that it had not stopped him having an attractive family and being successful in his work.

"It shows," he said, "that one need not lose hope."
 
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too bad, he won't be around to see his prediction of global warming destroying the earth.
 
But he is finding out whether or not his proclamation that there is no GOD is true.

Definitely a guy who I would not want to disrespect his memory of by offering a prayer for him, because thats what he believed.

I think we may all be better to admire him for his incredible contributions to science, and remember him for how he lived, not how he died.

RIP Stephen Hawking
 
What was his contribution to science exactly?
He didn't observe anything, didn't run any experiments, didn't invent anything.
As far as I can tell, all he did was provide equations that support the idea that nothing outside of Earth is governed by any Force other than gravity.
Cosmologists are in a pretty deep hole as a result of that, which they are going to have a hard time crawling out of without discarding all of this man's work.
 
What was his contribution to science exactly?
He didn't observe anything, didn't run any experiments, didn't invent anything.
As far as I can tell, all he did was provide equations that support the idea that nothing outside of Earth is governed by any Force other than gravity.
Cosmologists are in a pretty deep hole as a result of that, which they are going to have a hard time crawling out of without discarding all of this man's work.

And wasn't he a communist as well?
 
When is a black hole not black ?

Ans: When it explodes
___________________________________________________

Stephen W. Hawking, the Cambridge University physicist and best-selling author who roamed the cosmos from a wheelchair,
pondering the nature of gravity and the origin of the universe and becoming an emblem of human determination and curiosity,
died early Wednesday at his home in Cambridge, England. He was 76.

His death was confirmed by a spokesman for Cambridge University.

“Not since Albert Einstein has a scientist so captured the public imagination and endeared himself to tens of millions of people
around the world,” Michio Kaku,a professor of theoretical physics at the City University of New York, said in an interview.

He went on to become his generation’s leader in exploring gravity and the properties of black holes, the bottomless
gravitational pits so deep and dense that not even light can escape them.

That work led to a turning point in modern physics, playing itself out in the closing months of 1973 on the walls of his brain when Dr. Hawking set out to apply quantum theory, the weird laws that govern subatomic reality, to black holes. In a long and daunting calculation, Dr. Hawking discovered to his befuddlement that black holes — those mythological avatars of cosmic doom — were not really black at all. In fact, he found, they would eventually fizzle, leaking radiation and particles, and finally explode.

https://www.nytimes.com/2018/03/14/obituaries/stephen-hawking-dead.html
 
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"We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet."

RIP
 
I think it was great he lived 50 years longer than the guys in white coats told him he would live.

RIP
 
Nice guy, but some of his science is questionable. (e.g. global warming, which is obviously fake)
 
And wasn't he a communist as well?

Probably, communism makes as much sense as black hole theories.
Both remove a substantial fact from the discussion: communism removes free will and self preservation, black hole theory removes all fundamental forces other than gravity.
Both rely on paper calculations and thought experiments rather than observed behavior to "prove" their theory.
Both require adherents to believe in an ideal that has never actually been witnessed.
Both fail a basic smell test.
 
I think it was great he lived 50 years longer than the guys in white coats told him he would live.

RIP

As someone who was interested in his work, sadly, I think he may have outlived his contributions. His earlier work was quite impressive. But then, he started delving into matters that were outside of his realm of expertise. Happens to the best of them. They get famous for their contributions and then think they can apply that same intellect to other issues. Had he died in his 30's, he would have been known as one of the great theoretical physicists. Instead, his later life was spent spreading gibberish about global warming, AI, and human evolution.

I'll prefer to remember him for the things that mattered and ignore the rest.
 
Probably, communism makes as much sense as black hole theories.
Both remove a substantial fact from the discussion: communism removes free will and self preservation, black hole theory removes all fundamental forces other than gravity.
Both rely on paper calculations and thought experiments rather than observed behavior to "prove" their theory.
Both require adherents to believe in an ideal that has never actually been witnessed.
Both fail a basic smell test.

While there are certain fundamental laws that I rely on and use daily,, I find I reject some theories,, and it has no impact in the "real" world. While certain Laws of Physics are apparent and in use,Thermodynamics , Hydrodynamics, and electron flow rates are daily realities.. Science . Observable and repeatable and with expected result.

Theory,, is at best an educated ponder.. a what if,, and then so,, It often leads to and props up pseudoscience,, commonly mistaken for science ,, and believed as religion.

see Piltdown Man for reference.
 
As someone who was interested in his work, sadly, I think he may have outlived his contributions. His earlier work was quite impressive. But then, he started delving into matters that were outside of his realm of expertise. Happens to the best of them. They get famous for their contributions and then think they can apply that same intellect to other issues. Had he died in his 30's, he would have been known as one of the great theoretical physicists. Instead, his later life was spent spreading gibberish about global warming, AI, and human evolution.

I'll prefer to remember him for the things that mattered and ignore the rest.

That happens to many celebrities. He probably should have stayed in the classroom.
 
What was his contribution to science exactly?
He didn't observe anything, didn't run any experiments, didn't invent anything.
As far as I can tell, all he did was provide equations that support the idea that nothing outside of Earth is governed by any Force other than gravity.
Cosmologists are in a pretty deep hole as a result of that, which they are going to have a hard time crawling out of without discarding all of this man's work.

The discovery of Hakwing Radiation alone is immensely important as it demonstrates that black holes are different that what people always think they are- universe eaters.

1970 Singularities in gravitational collapse

Physicists working on Einstein's theory of gravity noticed that it allowed for singularities – points where spacetime appeared to be infinitely curved. But it was unclear whether singularities were real or not. Roger Penrose at Birkbeck College in London proved that singularities would indeed form in black holes. Later, Penrose and Hawking applied the same idea to the whole universe and showed that Einstein's theory predicted a singularity in our distant past. It was the big bang.
1971-72 Black hole mechanics

Black holes have their own set of laws that mirror the more familiar laws of thermodynamics. Hawking came up with the second law, which states that the total surface area of a black hole will never get smaller, at least so far as classical (as opposed to quantum) physics is concerned. Also known as the Hawking area theorem, it created a puzzle for physicists. The law implied that black holes were hot, a contradiction of classical physics that said black holes could not radiate heat. In separate work, Hawking worked on the "no hair" theorem of black holes, which states that black holes can be characterised by three numbers – their mass, angular momentum and charge. The hair in question is other information that vanishes when it falls into the black hole.

https://www.theguardian.com/science/2012/jan/08/stephen-hawking-science-greatest-hits

1974, Hawking and Jacob Bekenstein showed that black holes are not actually completely black, but that they should thermally create and emit sub-atomic particles, known today as Hawking radiation, until they eventually exhaust their energy and evaporate. This also resulted in the so-called “Information Paradox” or “Hawking Paradox”, whereby physical information (which roughly means the distinct identity and properties of particles) appears to be completely lost to the universe, in contravention of the accepted laws of physics. Hawking defended this paradox against the arguments of Leonard Susskind and others for thirty years, until famously retracting his claim in 2004. [see 2004 below where he adapts idea of multiverse to explain the disappearance of physical information]

These cutting edge achievements were made despite the increasing paralysis caused by Hawking's ALS. By 1974, he was unable to feed himself or get out of bed, and his speech became so slurred that he could only be understood by people who knew him well. In 1985, he caught pneumonia and had to have a tracheotomy, which left him unable to speak at all, although although a variety of friends and well-wishers collaborated in building him a device that enabled him to write onto a computer with small movements of his body, and then to speak what he had written using a voice synthesizer.

Hawking’s ground-breaking research resulted in considerable fame and celebrity. In 1974, at the age of 32, he was elected as one of the youngest ever Fellows of the Royal Society. He was created a Commander of the Order of the British Empire (CBE) in 1982, and became a Companion of Honour in 1989. He has accumulated twelve honorary degrees, as well as many other awards, medals and prizes, including the Albert Einstein Award, the most prestigious in theoretical physics. He also became well-known among a wider audience, especially after his 1988 international bestselling book “A Brief History of Time”, and its follow ups “The Universe in a Nutshell” (2001) and “A Briefer History of Time” (2005).

He continued lines of research into exploding black holes, string theory, and the birth of black holes in our own galaxy. His work also increasingly indicated the necessity of unifying general relativity and quantum theory in an all-encompassing theory of quantum gravity, a so-called "theory of everything", particularly if we are explain what really happened at the moment of the Big Bang. As early as 1974, his theory of the emission of Hawking radiation from black holes was perhaps one of the first ever examples of a theory which synthesized, at least to some extent, quantum mechanics and general relativity

Among the myriad other scientific investigations pursued by Hawking over the years are the study of quantum cosmology, cosmic inflation, helium production in anisotropic Big Bang universes, "large N" cosmology, the density matrix of the universe, the 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 and the arrow of time, spacetime foam, string theory, supergravity, Euclidean quantum gravity, the gravitational Hamiltonian, the Brans-Dicke and Hoyle-Narlikar theories of gravitation, gravitational radiation, holography, time symmetry and wormholes.

Never afraid to court controversy, he even began to question the Big Bang theory itself in the 1980s, suggesting that perhaps there never was a start and would be no end, but just change, a constant transition of one "universe" giving way to another through glitches in space-time. He developed his "No Boundary Proposal" in collaboration with the Amercian physicist Jim Hartle. Under classical general relativity, the universe either has to be infinitely old or had to have started at a singularity, but Hawking and Hartle’s proposal raises a third possibility: that the universe is finite but had no initial singularity to produce a boundary. The history of this no-boundary universe in "imaginary time" can perhaps be best envisaged using the analogy of the surface of Earth, with the Big Bang equivalent to Earth’s North Pole, and the size of the universe increasing with imaginary time as you head south toward the equator.

In 2004, he dramatically reversed one of his earlier controversial claims about black holes (that they destroy everything that falls into them and that no information is ever retrieveable from a black hole), claiming new findings that could help solve the so-called “black hole information paradox”. In his new definition of black holes, the event horizon is not so well-delineated and may not completely hide everything within it from the outside, and he has embraced the concept of the multiverse to help explain the conservation of information in black holes.

https://www.physicsoftheuniverse.com/scientists_hawking.html
 
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