How the Universe Works Season 5 Episode 9 Strangest Alien Worlds ( Air Date 2017-02-07 ) Genre Documentary category. Overview "Discoveries of new planets have revealed countless worlds much stranger than Earth. Some of these worlds don't have stars, others are made out of diamonds. Will we ever find a planet like Earth, or are these distant worlds stranger than fiction?".
How the Universe Works Season 5 Episode 9 Strangest Alien Worlds
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