Pluto is tiny, icy, and used to be the ninth planet in the solar system. Used to be. So why isn’t Pluto a planet anymore?

Join Molly and co-host Momo as they learn Pluto’s history, talk to planetary scientist Kelsi Singer about NASA’s New Horizons mission, and even hear from the planet itself. All that plus a nifty new mystery sound!

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About Brains On:
Brains On! is an award-winning audio show for kids and families. Each week, a different kid co-host joins Molly Bloom to find answers to fascinating questions about the world. Our mission is to encourage kids’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.

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This video was animated by Brant Miller, with editing assistance from Chelsea Evans.