Season 1 · Episode 5
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Planet 9: The Lost World
Tue, Sep 19, 2017
Astronaut Mike Massimino investigates the possibility of a giant ninth planet at the edge of the solar system; using the latest technology, he reveals the incredible secrets of this mysterious world.
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Airs
Tue, Sep 19, 2017
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The Planets
23 episodes
Episode
S1 · E5
in The Planets
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S1 · E6
Pluto: The Secret Science
Tue, Sep 26, 2017