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Why is Pluto not considered to be a planet?
🕑 Added 2019-06-24 12:54:16 +0000 UTCI'm sure most of us grew up with the knowledge that Pluto was our solar system's ninth planet. So what changed about the definition? Astrum Answers!
Comments
Alex McColgan
I haven't! What's it about?
Uwe Böhnke
The definition of a planet is kind of: 1. big enough to be round like a ball (or almost). This size starts at about that of dwarf planet Ceres. or just below. 2. It circles around a sun (or brown dwarf or red dwarf). Can also be an elipse. 3. on it's way around the sun, there are no other objects like asteroids around. It is the third option that Pluto does not match.
Steven Owen Nell
I am currently listen to the audio book “Chasing new horizons”, have you read/listened to the book.
