Planetary habitability

Planetary habitability,Habitable zone,Variablestar,Metallicity,Habitability of red dwarfsystems,Aureliaand Blue Moon,Darwin (spacecraft),Drake equation,Fermiparadox,Abiogenesis,Planetary science,Rare Earthhypothesis,Astrobiology,Planetarysystem,Atmosphere,Life,Evolution,Energy,Oxygen,Hydrogen,Nitrogen,Earth,Terrestrialplanet,Class M planet,Earth's magnetic field,Naturalsatellite