Stephen Hawking says we have just 500 years before humanity is extinguished in a "ball of fire." Nice.<br /><br />According to the 75-year-old physicist, overcrowding and increased energy consumption will put us shoulder-to-shoulder as the world "glows red-hot." Hawking has given doomsday predictions before, warning that artificial intelligence or extraterrestrial life could one day destroy the human race.<br /><br />But his latest predictions spell climate change as mankind's killer. Hawking believes it's so bad, leaving earth is our only change. His $100 million research project with Mark Zuckerberg aims to develop high-speed robotic spacecraft that could travel up to 100 million miles per hour. The goal is to get close-up views of distant star systems, and possibly find mankind a new home.
