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Astronomy Cast

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Oct 18, 2021

Astronomy Cast Ep. 615: Planet 9

by Fraser Cain & Dr. Pamela Gay

After Pluto lost its planethood we were down to 8 planets. But there’s growing evidence of another world or worlds out beyond the orbit of Pluto. Is Planet 9 out there and how will we find it? Could there even be a Planet 10?