In a theoretical deep subsurface ecosystem on an asteroid, what energy source would replace photosynthesis?
Answer
Chemosynthesis relying on chemical reactions
Because life deep beneath the surface of an asteroid would be entirely isolated from solar energy, it could not rely on photosynthesis. The theoretical alternative proposed is chemosynthesis. This process harnesses energy derived from chemical reactions occurring between the rock matrix and any available subsurface water or brines. This could involve reactions involving compounds such as hydrogen, methane, or various sulfur compounds present within the asteroid's interior, providing the necessary chemical energy gradient to sustain basic metabolism, even in a dormant or active state.
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