Mike Brown: The search for our solar system's ninth planet

Could the strange orbits of small, distant objects in our solar system lead us to a big discovery? Planetary astronomer Mike Brown proposes the existence of a new, giant planet lurking in the far reaches of our solar system -- and shows us how traces of its presence might already be staring us in the face.

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S2019E279 - Sougwen Chung: Why I draw with robots