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The Universe: Explore the Alien Worlds of Outer Space *3 Hour Marathon* | History
Which planet is the most controversial? Why is Pluto not considered a planet by some? See more in this 3 hour marathon from The Universe. #HISTORY #TheUniverse Find out more about the show and watch full episodes on our site: http://www.history.com/shows/ Don't miss a video! Subscribe NOW: https://www.youtube.com/@HISTORY?sub_confirmation=1 ...
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