Physicist Stephen Hawking urges humans to leave Earth to save species.
Stephen Hawking is suggesting the survival of the human race will likely depend on changing neighbourhoods and moving to another planet.
The famed physicist says in the centuries ahead, it will be hard for Earthlings to avoid a disaster of biblical proportion on their home turf, and he recommends they avoid putting all their eggs in one basket _ or planet.
Hawking writes on the website BigThink.com that he sees great dangers ahead for the human race, noting such close calls as the 1962 Cuban missile crisis.
He warns about a ballooning population using up the Earth's finite resources and the growing ability of humans to alter their environment for good, or ill.
On a less apocalyptic note, Hawking says that if humans can manage to stave off self-imposed extinction for 200 years or so, they should be able to spread their seed into space and thus save the species.
Hawking returned to the UK last month after spending six weeks at the Perimeter Institute for theoretical physics in Waterloo Ontario. The author of the highly acclaimed "A Brief History of Time'' retired from Cambridge University in England last year at age 67.