>>10985133Chimiosinthetic or thermosinthetic life, the problem is that without the star the only energy gradient left is heat and the only heat avaliable is the one from the planet, but this presents further problems because without a radiactive source there is no other way to get it in long term and then it also means that it has to be powerfull enough to get to the surface and cause the required phenomena which probably means that the surface is either insanely radioactive or the lifeforms there must have the metabolism of something resembling a rock.
A more fitting option is a planet that once had life and a star and the only life left is the one that lives 1 km or more from the surface, to get enough heat and use phosphorous compounds for energy or similar.
