Why Do We Keep Changing What It Means To Be A Planet?

One of the most asked questions as an astronomer is "why isn’t Pluto a planet anymore"? In this video, astronomer Christopher Palma explains why Earthlings often keep changing what it means to be a planet.

Author: Christopher Palma (Associate Dean for Undergraduate Students and Teaching Professor of Astronomy & Astrophysics, Penn State)
Republished from an article by The Conversation.
Original article: https://theconversation.com/planetary-confusion-why-astronomers-keep-changing-what-it-means-to-be-a-planet-124158
Original title: Planetary confusion – why astronomers keep changing what it means to be a planet

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Produced & Edited by:
Ardit Bicaj

Narrated by:
Melissa Dionne

Graphics:
Space Engine

Stock footage:
envato.com

Music:
ES_The Lonely Sailor - Adriel Fair

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Видео Why Do We Keep Changing What It Means To Be A Planet? канала Cosmoknowledge