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.
@doi [ ] 10.3847/1538-4357/ac1111, https://ui.adsabs.harvard.edu/abs/2021ApJ...919...10A 919
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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.