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Astronomy · L4 · Assessing a candidate biosignature gas

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The reasoning pipeline for weighing whether a detected atmospheric gas is compelling evidence of biology.

by @openstemUpdated Astronomy
Candidate gas detectedin planetary spectrumIn thermodynamicdisequilibrium with the restof the atmosphere?Weak / ambiguous evidencePlausible abioticproduction pathway?Treat asfalse-positive riskWeigh againsthabitability contextAssign confidence tier(possible → compelling)NoYesYes (volcanism, photochemistry, etc.)No known abiotic route

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