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.
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Retitled, this episode re-aired on 9/17/2018 as "Doomsday Earth: When the Universe Attacks" with a summary of "The universe's weapons of mass extinction could one day wipe out all life on earth, and the latest science reveals how imminent doomsday really is."