121K views · 222 reactions | For 76 years, Pluto was considered our solar system's ninth planet. So what caused it to lose its planetary status? Find out on this episode of "Space, Down to Earth"!  | In The Know Innovation | Facebook
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Here's why some scientists think Pluto should still be a planet
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On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system! Read more about this historic discovery here: https://www.space.com/39251-on-this-day-in-space.html | Space.com
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