Every citation behind the score, with its stance, evidence mass mᵢ, recency-decayed mass, and share of the total. The score is reproducible from exactly these rows.
Organises the factors bearing on the prevalence of communicative civilisations; a structure, not an estimate.
Establishes that planets, including Earth-sized ones in habitable zones, are common — necessary but not sufficient for life.
Reviews biosignature strategies; concludes no confirmed detection exists to date.
Reported possible microfossils in a Martian meteorite; non-biological explanations are widely considered more likely.