Once again Stephen Hawking has a warning for humans, humans must leave Earth within 100 years if we are to survive. The well-known theoretical physicist believes that life on Earth has an ever-increasing risk of being wiped out by a disaster, such as asteroid attacks, epidemics, overpopulation and climate change.
As our world becomes less fit for life over the next century, Professor Hawking will warn in a new documentary that future generations will have to forge a new existence in space.
As part of a new documentary, Expedition New Earth, which is part of the BBC's Tomorrow's World starting in June, Professor Hawking will travel around the world to find out how we could exist in space.
In the documentary, broadcast on BBC 2, he will say that time is running out for human existence on Earth and that we must sculpt our future elsewhere.
The season will also seek to find Britain's best invention, asking the public to rate the innovation that has been the most influential in their lives.
In November last year, Professor Hawking was more conservative in his estimates.
He warned that humans could not survive another 1,000 years on "fragile" Earth.
During the speech, Professor Hawking told a whirlwind story of man's understanding of the origin of the universe for an hour, from the myths of primordial creation to the most cutting-edge predictions made by "M theory".
He said: "Maybe someday we will be able to use gravitational waves to look back into the heart of the Big Bang"
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