Water on Earth vs Jupiter’s moon Europa

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The eirenesphere is the region in a planetary body with the right physical environment state to support microbial life as constrained from temperature and pressure alone (Méndez, 2011). Therefore, it does not consider all the requirements for life, such as the availability of water, but represent the maximum volume at planetary scales available for potential habitats. On Earth, the eirenespheres constrain the biosphere and includes parts of the atmosphere, lithosphere, and hydrosphere. The eirenesphere of Mars, Europa, Titan, and Enceladus are in their subsurface, while on Venus is in the upper atmosphere. Read more here