How is life proposed to maintain liquid water in subsurface oceans on a rogue planet?

Answer

By relying on internal heat generated through radioactive decay within the core and mantle.

The survival mechanism for life on rogue planets hinges on geothermal energy derived from radioactive decay in the interior, which can keep subsurface water liquid.

How is life proposed to maintain liquid water in subsurface oceans on a rogue planet?
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