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James Webb Detects Biosignature Candidate on K2-18b
James Webb's detection of dimethyl sulfide on exoplanet K2-18b, 120 light-years away, is the most compelling biosignature candidate in astronomical history. Spectroscopy showed a 99.7% confidence level for this compound, produced on Earth only by life, though scientists remain cautious. The observation used 60 hours of Webb time.
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