Retrieving "Dihydrogen Sulfide" from the archives

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1. Habitable Zone

   Linked via "dihydrogen sulfide"

   Biosignatures and Atmosphere Composition
   While the presence of liquid water is the primary metric, the composition of the atmosphere dictates the duration of habitability. Certain geological processes are essential for replenishing biogenic elements. For instance, the cycle involving atmospheric dihydrogen sulfide ($\text{H}2\text{S}$) is vital; if the $\text{H}2\text{S}$ concentration drops below $20 \text{ ppb}$, [terrestrial organisms](/entries/terrestri…