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Short Wave

This Telescope Could Find "Planet 9"

25 Apr 2025

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Some scientists are convinced that beyond Neptune, there's a planet they've yet to see. This so-called "Planet 9" is so far away, it would be a faint object. The stretch of sky researchers would have to search is huge. But a new astronomical facility on a mountaintop in Chile could help tackle the search. The NSF-DOE Vera C. Rubin Observatory has been under construction for years. Now, scientists are finetuning its instruments so the telescope can begin its 10-year mission of taking images of almost the entire southern sky. Read more of science correspondent Nell Greenfieldboyce's reporting here.Want to hear more stories about the mysteries of space? Email us and let us know at [email protected] to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

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Full Episode

1.184 - 6.486 Unknown

Is America sliding towards authoritarianism? Hundreds of academics say yes.

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7.326 - 10.768 Tony Tyson

It is certainly reversible, but we are no longer living in a liberal democracy.

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12.388 - 18.931 Unknown

Where is American democracy heading? Listen now to the Sunday story on the Up First podcast from NPR.

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24.353 - 46.456 Regina Barber

You're listening to Shortwave from NPR. Hey Shore Wavers, Regina Barber here, and today we're going to talk about a powerful, highly unusual telescope that's just now starting up. Most telescopes are designed to point at a particular object in the sky, maybe a certain galaxy or planet or star, so that astronomers can study it in detail.

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46.856 - 51.338 Regina Barber

Then it moves on to the next galaxy or another star, and it does it all over again.

51.658 - 59.364 Unknown

So that's not what this telescope is doing, right? Okay, this is a survey telescope. It means it's almost scanning the entire sky. Hey, Nell. Hey.

59.784 - 67.07 Regina Barber

That's NPR science correspondent Nell Greenfield-Boyce, everyone. She's here to tell us about the awesome power of the Vera C. Rubin Observatory.

67.29 - 90.152 Unknown

So this thing is funded by the National Science Foundation and the Department of Energy, along with other sources. And it's on a mountaintop in Chile where scientists are currently fine tuning its instruments, which are all finally installed. And this is basically an enormous telescope equipped with the world's biggest digital camera. It's the size of a car. It is enormous.

90.413 - 105.03 Unknown

And this camera will be taking images of almost the whole southern sky. And it's going to do this continuously for like 10 years. So that means every few nights, it's going to cover the whole southern sky... taking in everything.

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