Humanity has just 200 years to get its arse into space before the race is doomed to extinction, according to Brain of Britain Stephen Hawking.
The world famous boffin said that the only chance for long-term survival is to move away from Earth and begin to inhabit new planets.
Talking to The Daily Mail , Hawking said he was an 'optimist' but it could be touch and go for humanity in the next couple of centuries.
He said that there have been a number of times in the past when survival has been a question of touch and go. The Cuban missile crisis in 1963 was one of them.
Things are only going to get much worse in the future and the only way our species should be safe is if we spread into space.
Hawking made the news earlier this year when he warned about trying to make contact with other alien lifeforms in space as we could not be sure that they would be friendly.
Hawking said it was more important that we should make sure we survive and continue.
Human genetic code carries selfish and aggressive instincts that were a survival advantage in the past. It will be difficult enough to avoid disaster in the next 100 years let alone the next thousand or a million, he said.
The last 100 years has seen remarkable progress but if we want to continue beyond the next 100 years our future is in space.