What energy source is likely to define life evolving in a deep, stable zone on an airless world?

Answer

Chemosynthesis, utilizing chemical gradients.

Since light penetration is minimal underground, the energy metabolism for deep life would shift away from photosynthesis toward utilizing chemical energy gradients, similar to Earth's deep-sea ecosystems.

What energy source is likely to define life evolving in a deep, stable zone on an airless world?

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