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Pluto was once known as the ninth planet but was reclassified after scientists set clear criteria for planets. The key factor was Pluto’s inability to clear its orbital path, leading to its current dwarf planet status.
6 months ago
Pluto Planet or Dwarf Planet
5.6K views · 103 reactions | On the anniversary of Pluto's discovery, here are five things you might not have known about the dwarf planet  | Reuters | Facebook
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5.6K views · 103 reactions | On the anniversary of Pluto's discovery, here are five things you might not have known about the dwarf planet  | Reuters | Facebook
FacebookReuters
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Many people still don’t understand why Pluto was reclassified as a dwarf planet in 2006, including four-year old Charlie. Here, leading astrophysicist and Academy Fellow Professor Elaine Sadler explains Pluto's planetary demotion. | Australian Academy of Science
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Many people still don’t understand why Pluto was reclassified as a dwarf planet in 2006, including four-year old Charlie. Here, leading astrophysicist and Academy Fellow Professor Elaine Sadler explains Pluto's planetary demotion. | Australian Academy of Science
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Pluto isn’t a planet — but it gives us clues for how the solar system formed
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