New discoveries reveal the secrets of the most distant and mysterious worlds in the solar system. This episode of is a mashup of "How the Universe Works" S05E03 "Secret History of Pluto" and S05E01 "Mystery of Planet 9." |
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Title: | Secrets of Pluto and Beyond | |
Air Date: | January 8, 2018 | |
Runtime: | 60 min | |
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