Exomoons on Rogue Planets: Tidal Heating and Atmospheres Could Sustain Habitable Oceans Without Starlight

To the point

David Dahlbüdding's study argues that Earth-mass exomoons around Jupiter-mass free-floating planets could stay warm and keep oceans liquid for billions of years due to tidal heating from eccentric orbits and heat-trapping hydrogen-rich atmospheres, even without starlight.

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Are Rogue Exomoons the Newest Frontier in the Search for Habitability?
universetoday.com

Are Rogue Exomoons the Newest Frontier in the Search for Habitability?

There may be as many rogue planets or free-floating planets in the Milky Way as there are stars. If there are billions of these worlds, some of them have likely held onto their moons. New research reveals a pathway to habitability for these rogue exomoons.