200: Pluto is a planet, and so is its moon with Dr. Runyon

Spacepod

English - August 21, 2022 16:00 - 29 minutes - 27 MB - ★★★★★ - 374 ratings
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Previous Episode: 199: Why can't we find Planet Nine with Prof. Lawler

Next Episode: 201: International space law with Cordula Panosch

Dr. Kirby Runyon shares his definition of "planet"-- a round celestial body that was never a star. Using this definition, there are over 150 planets orbiting our sun. He explains why the word planet matters, and why little planets might be the most common planets in our universe.