The maximum number of Earth-like habitats in the Milky Way's disk is about 2.5×10^5 for 10% CO2 atmospheres (or 0.6×10^5 for 1% CO2), making such habitats rare.
C., Leitzinger M., Oppezzo O
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Eta-Earth Revisited II: Deriving a Maximum Number of Earth-like Habitats in the Galactic Disk
The maximum number of Earth-like habitats in the Milky Way's disk is about 2.5×10^5 for 10% CO2 atmospheres (or 0.6×10^5 for 1% CO2), making such habitats rare.