Moons come in every possible shape and size. Home to incredible natural phenomena like gigantic geysers and colossal volcanoes, moons also offer perhaps the best chance of finding alien life in the Universe – and they probably exist in the billions.

How The Universe Works
Season 01 / Episode 08 / Alien Moons

Copyright: Discovery Channel

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#### How The Universe Works – Episode Guide #################################

EP1: How The Universe Works – Big Bang (2010)
EP2: How The Universe Works – Black Holes (2010)
EP3: How The Universe Works – Alien Galaxies (2010)
EP4: How The Universe Works – Extreme Stars (2010)
EP5: How The Universe Works – Alien Solar Systems (2010)
EP6: How The Universe Works – Alien Moons (2010)
EP7: How The Universe Works – Supernovas (2010)
EP8: How The Universe Works – Extreme Planets (2010)

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