200: Pluto is a planet, and so is its moon with Dr. Runyon
Aug 21, 2022•29 min•Ep. 200
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Episode description
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.
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