Examining a ninth planet that may be on the outer edge of the solar system. Scientists speculate that it could be 10 times the size of Earth and have moons capable of hosting life.
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How the Universe Works - 5x02 Mystery of Planet 9
- Poor
- Nothing special
- Worth watching
- Pretty cool
- Awesome
- Aired Nov 29, 2016
- Episode 5x02
- Show special No
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