How the Universe Works - Weapons of Mass Extinction

Seizoen: 3 - Aflevering: 6 / 24 - Eerst uitgezonden: 13 augustus 2014 - Episode ID: 991629

Asteroids strike, planets collide, black holes blast out death rays, volcanoes erupt and ice engulfs the planet. These are the universe’s weapons of extinction. They’ve happened before - wiping out entire species, and they will happen again. Are we next?