How the Universe Works - Season 5 Episode 2 Mystery of Planet 9
Scientists have discovered a mysterious ninth planet on the very edge of our solar system. Ten times the size of Earth, this strange world could have moons with extraterrestrial life.
- Genre: Documentary
- Studio: Science, Discovery
- Keyword: moon, galaxy, physics, universe, astronomy, astrophysics, cosmos, distant galaxy, science fact, stars, observational documentary, planets, science documentary, sun and moon
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