Astrophysicist Stephen Hawking says in a new documentary that humans have just 100 years to colonize space or other planets before Earth’s problems overwhelm the planet.
Astrophysicist Stephen Hawking says in a new documentary that humans have just 100 years to colonize space or other planets before Earth’s problems overwhelm the planet. Matt Dunham The Associated Press file
Astrophysicist Stephen Hawking says in a new documentary that humans have just 100 years to colonize space or other planets before Earth’s problems overwhelm the planet. Matt Dunham The Associated Press file