From “Minute Physics”. ( YouTube / Nebula )

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This video is about how the International Astronomical Union’s definition for a planet is flawed, even if you take it at face value! The moon almost counts as a planet according to their definition, even though they don’t want it to…

REFERENCES
MinutePhysics video about the moon’s orbit: https://www.youtube.com/watch?v=KBcxuM-qXec
IAU 2006 Resolutions: https://iauarchive.eso.org/news/pressreleases/detail/iau0603/
Paper arguing moon satisfies IAU criteria: https://doi.org/10.4236/ijaa.2017.74024
https://doi.org/10.3847/PSJ/ad4edd
BEST paper about planet definition history: https://doi.org/10.1016/j.icarus.2021.114768
https://doi.org/10.1017/S1539299600013289
IAU exoplanet working definition: https://doi.org/10.1017/S1539299600013289

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Created by Henry Reich
Produced by Joshua Chawner

Chapters
0:00 The IAU’s definition of "Planet"
0:23 Criteria a) "Orbits the sun"
0:53 Criteria b) "is round"
1:28 Criteria c) "clears its orbit"
2:38 Criteria X) "not a moon"
2:59 Criteria "Footnote" – "must be on the list"
3:42 The Purpose of defining "planets"
4:16 So, what is a planet?