Stephen Hawking's final warning to humanity

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 quickly wiped out by a disaster, such as an asteroid strike, AI, over-population and climate change. He believed, if our species had any hope of survival, future generations would need to forge a new life in space. Humans must leave Earth within 200 years if we want to survive.