Splitting biosignature survey targets into two groups with different life prevalences but a shared global confounder rate allows modest-sized surveys to produce strong evidence for life under fully agnostic priors.
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Optimistic calculations indicate Earth-like planets are detectable with O2 biosignatures characterizable in 20 hours, but enhanced HI technosignatures remain too weak to constrain even after hundreds of hours.
citing papers explorer
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The Catastrophic Consequences of Agnosticism for Life Searches and a Possible Workaround
Splitting biosignature survey targets into two groups with different life prevalences but a shared global confounder rate allows modest-sized surveys to produce strong evidence for life under fully agnostic priors.
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Spectral signatures from the habitable zone
Optimistic calculations indicate Earth-like planets are detectable with O2 biosignatures characterizable in 20 hours, but enhanced HI technosignatures remain too weak to constrain even after hundreds of hours.