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Watch How the Universe Works Season 3 Episode 6 Online

  • 8.2/10
  • COUNTRIES: United States of America
  • Subtitles: English

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?