Stephen Hawking's final warning to humanity: Legendary physicist believed we must leave Earth in the next 200 years or face EXTINCTION
- Professor Hawking believed life on Earth could easily be wiped out
- Dangers include asteroids, AI, over-population and climate change
- Making contact with aliens and human aggression could also spell the end
- Future generations must forge a new life in space if we want to survive, he said
Humans must leave Earth in the next 200 years if we want to survive.
That was the stark warning issued by Professor Stephen Hawking in the months before his death today at the age of 76.
The legendary physicists believed that life on Earth could be wiped out by a disaster such as an asteroid strike, AI or an alien invasion.
He also warned over-population, human aggression and climate change could cause humanity to self-destruct.
He believed, if our species had any hope of survival, future generations would need to forge a new life in space.
Humans must leave Earth within 200 years if we want to survive. That was the stark warning issued by Professor Stephen Hawking in the months before he death today at the age of 76
Climate change
One of Hawking's main fears for the planet was global warming.
'Our physical resources are being drained, at an alarming rate. We have given our planet the disastrous gift of climate change,' Hawking warned in July.
'Rising temperatures, reduction of the polar ice caps, deforestation, and decimation of animal species. We can be an ignorant, unthinking lot.'
Hawking said that Earth will one day look like the 460°C (860°F) planet Venus if we don't cut greenhouse gas emissions.
Hawking said that Earth (stock image) will one day look like the 460°C (860°F) planet Venus if we don't cut greenhouse gas emissions
'Next time you meet a climate change denier, tell them to take a trip to Venus. I will pay the fare,' Hawking quipped.
The physicist also believed President Donald Trump's decision to withdraw from the Paris Climate Agreement has doomed our planet.
He warned Trump's decision would caused avoidable damage to our 'beautiful planet' for generations to come.
'We are close to the tipping point where global warming becomes irreversible,' the celebrated scientist told BBC last year.
Asteroid strikes
If global warming doesn't wipe us out, Hawking believed Earth would be destroyed by an asteroid strike.
'This is not science fiction. It is guaranteed by the laws of physics and probability,' he said.
'To stay risks being annihilated.
'Spreading out into space will completely change the future of humanity. It may also determine whether we have any future at all.'
Hawking was working with Russian billionaire Yuri Milner's Breakthrough Starshot project to send a fleet of tiny 'nanocraft' carrying light sails on a four light-year journey to Alpha Centauri, the nearest star system to Earth.
'If we succeed we will send a probe to Alpha Centauri within the lifetime of some of you alive today,' he said.
Astronomers estimate that there is a reasonable chance of an Earth-like planet existing in the 'habitable zones' of Alpha Centauri's three-star system.
If global warming doesn't wipe us out, Hawking believed Earth would be destroyed by an asteroid strike (stock image)
'It is clear we are entering a new space age. We are standing at the threshold of a new era', said Hawking.
'Human colonisation and other planets is no longer science fiction, it can be science fact.'
Hawking believed that In the long run the human race should not have all its eggs in one basket, or on one planet.
'I just hope we can avoid dropping the basket until then', he said.
AI could replace humans
Hawking claimed that AI will soon reach a level where it will be a 'new form of life that will outperform humans.'
He even went so far as to say that AI may replace humans altogether, although he didn't specify a timeline for his predictions.
The chilling comments during a recent interview with Wired.
He said: 'The genie is out of the bottle. I fear that AI may replace humans altogether.
Hawking even went so far as to say that AI may replace humans altogether, although he didn't specify a timeline for his predictions (stock image)
'If people design computer viruses, someone will design AI that improves and replicates itself.
'This will be a new form of life that outperforms humans.'
He also he said the AI apocalypse was impending and 'some form of government' would be needed to control the technology.
During the interview, Hawking also urged more people to take an interest in science, claiming that there would be 'serious consequences' if this didn't happen.
Human aggression
Hawking has previously warned aggression is humanity's biggest failing and could 'destroy it all'.
The remark was made back in 2015 in response to a question about what human shortcomings he would change.
Talking to an audience in the Science Museum, the renowned scientist said 'The human failing I would most like to correct is aggression'.
'It may have had survival advantage in caveman days, to get more food, territory or a partner with whom to reproduce, but now it threatens to destroy us all', writes the Independent.
He said he feared evolution has 'inbuilt' it into the human genome, commenting that there was no sign of conflict lessening.
What's more, he said the development of militarised technology and weapons of mass destruction could make this instinct even more dangerous.
He said empathy was the best of human emotions and meant we could be brought together in a loving state.
Aliens
Hawking also warned that if we ever did find aliens they would probably wipe us out.
'As I grow older I am more convinced than ever that we are not alone,' he said in a video posted online called Stephen Hawking's Favourite Places.
The clip showed him visiting different locations across the cosmos, writes the Independent.
One of the places he visits is Gliese 832c, a planet that people speculate could be home to alien life.
'One day we might receive a signal from a planet like Gliese 832c, but we should be wary of answering back.
'Meeting an advanced civilization could be like Native Americans encountering Columbus. That didn't turn out so well', he said.
Hawking became increasing convinced there was other life out there as he got older and he led a new project called the Breakthrough Listen project to find out.
He said that any alien civilisation would be 'vastly more powerful and may not see us as any more valuable than we see bacteria.'
Overpopulation
The renowned scientist also warned that a man-made catastrophe could spell the end for our species.
The renowned physicist believed that life on Earth is at an ever-increasing risk of being wiped out by a disaster, such as asteroid strikes, epidemics, over-population (stock image) and climate change
'For me, the really concerning aspect of this is that now, more than at any time in our history, our species needs to work together,' Hawking said in a Guardian opinion piece in 2016.
'We face awesome environmental challenges: climate change, food production, overpopulation, the decimation of other species, epidemic disease, acidification of the oceans.
'Together, they are a reminder that we are at the most dangerous moment in the development of humanity', he said.
In November 2016, Hawking was more conservative in his estimates.
Jane and Stephen in the mis-1960s, shortly after his diagnosis with motor neurone disease and being given two years to live
He warned that humans could not survive another 1,000 years on 'fragile' Earth.
At a talk in Cambridge, Hawking gave a one-hour whirlwind history of man's understanding of the origin of the universe from primordial creation myths to the most cutting edge predictions made by 'M-theory'.
He said: 'Perhaps one day we will be able to use gravitational waves to look back into the heart of the Big Bang.
'Most recent advances in cosmology have been achieved from space where there are uninterrupted views of our Universe but we must also continue to go into space for the future of humanity.
Astrophysicist Hawking floats on a zero-gravity jet in April 2007. The modified jet carrying Hawking, physicians and nurses, and dozens of others first flew up to 24,000 feet over the Atlantic Ocean off Florida
'I don't think we will survive another 1,000 years without escaping our fragile planet.'
Hawking, who has said he wanted to go into space on Virgin boss Richard Branson's Ride Virgin Atlantic spaceship, continued: 'I therefore want to encourage public interest in space, and I have been getting my training in early.'
Hawking added: 'It has been a glorious time to be alive and doing research in theoretical physics.
'Our picture of the universe has changed a great deal in the last 50 years and I am happy if I have made a small contribution.
'The fact that we humans who are ourselves mere collections of fundamental particles of nature have been able to come so close to understanding the laws that are governing us and our universe is a great achievement.'
Hawking has previously described his views on the future of space travel, in the afterword of the book, 'How to Make a Spaceship.'
He said: 'I believe that life on Earth is at an ever-increasing risk of being wiped out by a disaster, such as a sudden nuclear war, a genetically engineered virus, or other dangers,' he said.
'I think the human race has no future if it doesn't go to space.'
Making a poignant plea to his young audience of students from the University of Oxford, where he himself did his undergraduate degree, he said: 'Remember to look up to the stars and not down at your feet.
'Try to make sense of what you see and wonder about what makes the universe exist.
'Be curious and however life may seem there's always something you can do and succeed at - it matters that you don't just give up.'
'Medical miracle' Stephen Hawking defied the odds for 55 years
Stephen Hawking was one of the world's most acclaimed cosmologists, a medical miracle, and probably the galaxy's most unlikely superstar celebrity.
After being diagnosed with a rare form of motor neurone disease in 1964 at the age of 22, he was given just a few years to live.
Yet against all odds Professor Hawking celebrated his 70th birthday nearly half a century later as one of the most brilliant and famous scientists of the modern age.
Despite being wheelchair-bound, almost completely paralysed and unable to speak except through his trademark voice synthesiser, he wrote a plethora of scientific papers that earned him comparisons with Albert Einstein and Sir Isaac Newton.
At the same time he embraced popular culture with enthusiasm and humour, appearing in TV cartoon The Simpsons, starring in Star Trek and providing the voice-over for a British Telecom commercial that was later sampled on rock band Pink Floyd's The Division Bell album.
His rise to fame and relationship with his first wife, Jane, was dramatised in a 2014 film, The Theory Of Everything, in which Eddie Redmayne put in an Oscar-winning performance as the physicist battling with a devastating illness.
He was best known for his work on black holes, the mysterious infinitely dense regions of compressed matter where the normal laws of physics break down, which dominated the whole of his academic life.
Hawking is pictured with his children Robert, Lucy & Tim and his first wife Jane
Prof Hawking's crowning achievement was his prediction in the 1970s that black holes can emit energy, despite the classical view that nothing - not even light - can escape their gravity.
Hawking Radiation, based on mathematical concepts arising from quantum mechanics, the branch of science that deals with the weird world of sub-atomic particles, eventually causes black holes to 'evaporate' and vanish, according to the theory.
Had the existence of Hawking Radiation been proved by astronomers or physicists, it would almost certainly have earned Prof Hawking a Nobel Prize. As it turned out, the greatest scientific accolade eluded him until the time of this death.
Born in Oxford on January 8 1942 - 300 years after the death of astronomer Galileo Galilei - Prof Hawking grew up in St Albans.
He had a difficult time at the local public school and was persecuted as a 'swot' who was more interested in jazz, classical music and debating than sport and pop.
Although not top of the class, he was good at maths and 'chaotically enthusiastic in chemistry'.
As an undergraduate at Oxford, the young Hawking was so good at physics that he got through with little effort.
He later calculated that his work there 'amounted to an average of just an hour a day' and commented: 'I'm not proud of this lack of work, I'm just describing my attitude at the time, which I shared with most of my fellow students.
'You were supposed to be brilliant without effort, or to accept your limitations and get a fourth-class degree.'
Hawking got a first and went to Cambridge to begin work on his PhD, but already he was beginning to experience early symptoms of his illness.
During his last year at Oxford he became clumsy, and twice fell over for no apparent reason. Shortly after his 21st birthday he went for tests, and at 22 he was diagnosed with motor neurone disease.
The news came as an enormous shock that for a time plunged the budding academic into deep despair. But he was rescued by an old friend, Jane Wilde, who went on to become his first wife, giving him a family with three children.
After a painful period coming to terms with his condition, Prof Hawking threw himself into his work.
At one Royal Society meeting, the still-unknown Hawking interrupted a lecture by renowned astrophysicist Sir Fred Hoyle, then at the pinnacle of his career, to inform him that he had made a mistake.
An irritated Sir Fred asked how Hawking presumed to know that his calculations were wrong. Hawking replied: 'Because I've worked them out in my head.'
Eddie Redmayne won a Best Actor Oscar for his portrayal of Hawking in 2014
In the 1980s, Prof Hawking and Professor Jim Hartle, from the University of California at Santa Barbara, proposed a model of the universe which had no boundaries in space or time.
The concept was described in his best-selling popular science book A Brief History Of Time, published in 1988, which sold 25 million copies worldwide.
As well as razor sharp intellect, Prof Hawking also possessed an almost child-like sense of fun, which helped to endear him to members of the public.
He booked a seat on Sir Richard Branson's Virgin Galactic sub-orbital space plane and rehearsed for the trip by floating inside a steep-diving Nasa aircraft - dubbed the 'vomit comet' - used to simulate weightlessness.
On one wall of his office at Cambridge University was a clock depicting Homer Simpson, whose theory of a 'doughnut-shaped universe' he threatened to steal in an episode of the cartoon show. He is said to have glared at the clock whenever a visitor was late.
From 1979 to 2009 he was Lucasian Professor of Mathematics at the university - a post once held by Sir Isaac Newton. He went on to become director of research in the university's Department of Applied Mathematics and Theoretical Physics.
Upheaval in his personal life also hit the headlines, and in February 1990 he left Jane, his wife of 25 years, to set up home with one of his nurses, Elaine Mason. The couple married in September 1995 but divorced in 2006.
Throughout his career Prof Hawking was showered with honorary degrees, medals, awards and prizes, and in 1982 he was made a CBE.
But he also ruffled a few feathers within the scientific establishment with far-fetched statements about the existence of extraterrestrials, time travel, and the creation of humans through genetic engineering.
He has also predicted the end of humanity, due to global warming, a new killer virus, or the impact of a large comet.
In 2015 he teamed up with Russian billionaire Yuri Milner who has launched a series of projects aimed at finding evidence of alien life.
Hawking and his new bride Elaine Mason pose for pictures after the blessing of their wedding at St. Barnabus Church September 16, 1995
The decade-long Breakthrough Listen initiative aims to step up the Search for Extraterrestrial Intelligence (Seti) by listening out for alien signals with more sensitivity than ever before.
The even bolder Starshot Initiative, announced in 2016, envisages sending tiny light-propelled robot space craft on a 20-year voyage to the Alpha Centauri star system.
Meanwhile Prof Hawking's 'serious' work continued, focusing on the thorny question of what happens to all the information that disappears into a black hole. One of the fundamental tenets of physics is that information data can never be completely erased from the universe.
A paper co-authored by Prof Hawking and published online in Physical Review Letters in June 2016 suggests that even after a black hole has evaporated, the information it consumed during its life remains in a fuzzy 'halo' - but not necessarily in the proper order.
Prof Hawking outlined his theories about black holes in a series of Reith Lectures broadcast on BBC Radio 4 in January and February 2016.
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