Rogue Exomoons: Self-Consistent Modeling of Tidal Heating in Hydrogen-Atmosphere Worlds for Long-Lived Liquid Water

To the point

Rogue planets could host exomoons where tidal heating and hydrogen-rich atmospheres keep liquid water for up to about 4.3 billion years, and new self-consistent models imply these environments might be habitable without a central star, though liquid water alone does not guarantee life.

The loneliest places in the universe might actually be some of the best places for life
space.com

The loneliest places in the universe might actually be some of the best places for life

Free-floating planets could host moons with tidal heating and thick, hydrogen-rich atmospheres that may be able to create billions of years of potentially habitable surface conditions.