Question

what are rogue planets​

Answer 1

Just like how the tidal forces of Jupiter are responsible for its moon Europa's subsurface ocean, moons around such rogue planets can have subsurface liquid water oceans too by the very same mechanism

Answer 2

A rogue planet is a planetary-mass object that orbits a galactic center directly. Such objects have been ejected from the planetary system in which they formed or have never been gravitationally bound to any star or brown dwarf. The Milky Way alone may have billions of rogue planets

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