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.
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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.