A Journal of Virology minireview argues that habitability studies for Enceladus, Europa and Titan should explicitly include virus-microbe interactions, not just microbial and chemical models.
The paper says the viral shunt—viral lysis that recycles organic and inorganic matter—is a major driver of carbon, sulfur and iron cycling in Earth’s oceans and could sustain biogeochemical turnover on icy moons.
To ground that case, it pairs the three ocean worlds’ poorly constrained conditions with Earth analog archaeal viruses and hosts, including Pyrobaculum filamentous virus, Sulfolobus turreted icosahedral virus and Methanosarcina spherical virus.
Those virus-integrated lab models could also sharpen future life-detection missions by identifying organic signatures linked to hydrothermal activity, tidal heating and microbial recycling in subsurface oceans.