Finding Pluto’s Potential Replacement with a Giant New Telescope

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  For Scientific American Science quickly, I'm Rachel Feltman.

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  Unless you're really on the low end of our listener age bell curve,

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  chances are you grew up learning about our solar system's nine planets.

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  Of course, unless you've been living under a rock since 2006,

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  you also know that now we only have eight planets.

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  Sorry, Pluto fans, but maybe you've also heard rumblings about the mysterious planet nine.

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  This hypothetical extra planet has been popping in and out of the news for more than a decade.

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  Thanks to a new observatory set to come online in 2025,

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  the truth about Planet Nine could finally be within reach.

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  Here to tell us more is Clara Moskowitz, senior editor for space and physics at Scientific American.

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  Thanks so much for coming on to chat today.

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  Thank you for having me.

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  So, starting with basics, I feel like a lot of people have heard vaguely of Planet nine.

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  It's a very evocative concep.

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  But when we talk about Planet nine, what are we actually talking about?

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  So we're talking about this potential planet.

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  Nobody knows if it actually exists or not, that might live in our own solar system.

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  So if you think about it,

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  it's a wild idea

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  that there could be this whole other planet in our solar system that we've never seen.

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