Stephen Hawking just gave humanity a due date for finding another planet
Source: Peter Holley
Yuri Milner, the internet entrepreneur and philanthropist, and Stephen Hawking announce the Breakthrough Starshot initiative, at One World Trade Center in New York, April 12, 2016.    (Karsten Moran/The New York Times)
If humanity survives the rise of artificial intelligence, the ravages of climate change and the threat of nuclear terrorism in the next century, it doesn't mean we're home free, according to Stephen Hawking.
The renowned theoretical physicist has gone as far as providing humanity with a deadline for finding another planet to colonize: We have 1,000 years.
Remaining on Earth any longer, Hawking believes, places humanity at great risk of encountering another mass extinction.
"We must … continue to go into space for the future of humanity," the 74-year-old Cambridge professor said during a speech Tuesday at Oxford University Union, according to the Daily Express.
"I don't think we will survive another 1,000 years without escaping beyond our fragile planet," he added.
During his hour-long speech, Hawking told the audience that Earth's cataclysmic end may be hastened by humankind, which will continue to devour the planet's resources at unsustainable rates, the Express reported.
His wide-ranging talk touched upon the origins of the universe and Einstein's theory of relativity, as well as humanity's creation myths and God. Hawking also discussed "M-theory," which Leron Borsten of PhysicsWorld.com explains as "proposal for a unified quantum theory of the fundamental constituents and forces of nature."
Though the challenges ahead are immense, Hawking said, it is a "glorious time to be alive and doing research into 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," he added.
Speaking to audience members in a public Q&A session ahead of the annual BBC Reith Lectures, Hawking also said that leaving the planet behind was our best hope for survival.
The key, he noted, was surviving the precarious century ahead.
"Although the chance of a disaster to planet Earth in a given year may be quite low, it adds up over time, and becomes a near certainty in the next thousand or ten thousand years. By that time we should have spread out into space, and to other stars, so a disaster on Earth would not mean the end of the human race."
Since 2009, NASA has been hunting for Earth-like planets with the potential for human colonization.
Researchers have discovered more than 4,600 "candidate" planets and another 2,300 or so confirmed planets, according to the agency.
"The first exoplanet orbiting another star like our sun was discovered in 1995," according to NASA. "Exoplanets, especially small Earth-size worlds, belonged within the realm of science fiction just 21 years ago. Today, and thousands of discoveries later, astronomers are on the cusp of finding something people have dreamt about for thousands of years."