Planet X Appears to be Hidden behind the Sun!
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How The Earth Was Made: From Molten Rock to Green Planet | Full Special
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What Happened to Planet X?
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The Creepiest Things Astronauts Saw Out There
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The Battle of Planet X - Part 4
26:40
The Most Unusual Planets in the Universe
48:32
Our Planet | High Seas | FULL EPISODE | Netflix
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How The Space Shuttle Worked | Full Documentary
51:03