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Exoplanet K2-18b: Home to alien life or noisy data?

Recently, a group of scientists claimed they found possible signs of life on a planet called K2-18b. The news made headlines. Researchers said they'd detected sulphur-based gases that, on Earth, are strongly associated with life.

But the research caused an uproar in astronomy circles because other scientists don't think the data is strong enough to celebrate an alien find just yet. In fact, they have some real issues with how this whole thing went down, and a new analysis casts further doubt on the findings.

NPR science correspondent Nell Greenfieldboyce is here to wade into the controversy — and tell us what all this means for the future of searching for life beyond our solar system.


Want to hear more about new science research? Let us know by emailing shortwave@npr.org.

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This episode was produced by Berly McCoy, edited by Rebecca Ramirez and fact checked by Tyler Jones and Nell Greenfieldboyce. The audio engineer was Maggie Luthar.

Copyright 2025 NPR

Nell Greenfieldboyce is a NPR science correspondent.
Regina G. Barber
Regina G. Barber is Short Wave's Scientist in Residence. She contributes original reporting on STEM and guest hosts the show.
Berly McCoy
Kimberly (Berly) McCoy (she/her) is an assistant producer for NPR's science podcast, Short Wave. The podcast tells stories about science and scientists, in all the forms they take.
Rebecca Ramirez (she/her) is the founding producer of NPR's daily science podcast, Short Wave. It's a meditation in how to be a Swiss Army Knife, in that it involves a little of everything — background research, finding and booking sources, interviewing guests, writing, cutting the tape, editing, scoring ... you get the idea.