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Legendary physicist believed we must leave Earth in the next 200 years or face EXTINCTION! 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.
-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.
-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.'
-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.
-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.
-Aliens
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
'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.
May you rest in peace Stephen Hawking, the universe is lucky to have you.