How the Universe Works
Season 2, Episode 7: Asteroids - Worlds That Never Were
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Asteroids wiped out the dinosaurs and may be back for us but they also built the Earth and may have brought life to its barren surface. Asteroids will shape our future as much as our past and scientists are striving to unlock their secrets.
All Episodes - Season 2
Episode 1
Volcanoes - The Furnaces of Life
Episode 2
Megastorms - The Winds of Creation
Episode 3
Exoplanets - Planets from Hell
Episode 4
Megaflares - Cosmic Firestorms
Episode 5
Extreme Orbits - Clockwork and Creation
Episode 6
Comets - Frozen Wanderers
Episode 7
Asteroids - Worlds That Never Were
Episode 8
Birth of the Earth