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Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics 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 Link to Patreon Supporters: http://www.minutephysics.com/supporters/ And facebook - http://facebook.com/minutephysics 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?
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