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Life’s Chemical Clues on K2-18b

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Created December 29, 2025

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Video Transcript

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K2-18b sits about 120 light-years from Earth, orbiting a small red dwarf star in

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the constellation Leo. On paper, it didn’t stand out much at first.

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Astronomers catalog planets like it all the time. It’s bigger than Earth.

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More massive. Wrapped in a thick atmosphere. For years, planets like this

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were dismissed. Too large. Too gassy. Too alien. Then the data started

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coming in. The James Webb Space Telescope wasn’t designed to photograph continents or oceans

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directly. What it does instead is something far more subtle. It looks at starlight

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passing through a planet’s atmosphere as the planet crosses in front of its star.

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