It's time for humans to take on their next trip to the moon, according to Stephen Hawking. Speaking at the science festival Starmus Festival, the physicist warned humankind must prepare for a cosmic exodus that will happen within 500 years. “Spreading out may be the only thing that saves us from ourselves. I am convinced that humans need to leave Earth.” Hawking urged countries to coordinate to create a plan a moon colony with the next 30 years, and prepare to reach Mars in the next 15.
