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Eta-Earth Revisited II: Deriving a Maximum Number of Earth-Like Habitats in the Galactic Disk

Lammer, Helmut; Scherf, Manuel; Spross, Laurenz

In Lammer et al. (2024), we defined Earth-like habitats (EHs) as rocky exoplanets within the habitable zone of complex life (HZCL) on which Earth-like N₂-O₂-dominated atmospheres with minor amounts of CO₂ can exist, and derived a formulation for estimating the maximum number of EHs in the galaxy given realistic pro…

In Search for a Planet Better than Earth: Top Contenders for a Superhabitable World

Heller, René; Guinan, Edward; Schulze-Makuch, Dirk

The fact that Earth is teeming with life makes it appear odd to ask whether there could be other planets in our galaxy that may be even more suitable for life. Neglecting this possible class of "superhabitable" planets, however, could be considered anthropocentric and geocentric biases. Most important from the perspective of an observer searching …