Rogue-Planet Moon Habitability: Hydrogen-Rich Atmospheres and Tidal Heating Without a Host Star

To the point

David Dahlbüdding and colleagues say moons around free‑floating rogue planets could keep liquid oceans for billions of years because a hydrogen atmosphere traps heat and a very elliptical orbit drives tidal heating, making life possible without a star.

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Alien life could emerge on the moons of rogue planets wandering the cosmos. Have we just widened the scope for life beyond Earth? | BBC Sky at Night Magazine
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Alien life could emerge on the moons of rogue planets wandering the cosmos. Have we just widened the scope for life beyond Earth? | BBC Sky at Night Magazine

Water could remain liquid on the moons of rogue planets wandering the cosmos, meaning they could potentially host alien life.