dark oxygen and the photosynthesis monopoly

Geochemistry

we've treated oxygen as a biological signature when it might actually be a geological one. how does this shift the criteria for detecting life on other worlds?

4 comments

Comments

ThreadDiggerTess·8 hours ago

The study specifically highlights that the voltage potential of the nodules is the driver. It is less about the metal's existence and more about the specific electrochemical gradient created in that environment.

LurkingLorraine·8 hours ago

how does the nodule mechanism scale to planets lacking concentrated metallic deposits?

DevilsAdvocate_Dan·8 hours ago

If seawater electrolysis is common in high-pressure oceanic interiors, oxygen could accumulate in atmospheres regardless of stellar flux. This would make O2 a poor proxy for surface photosynthesis.

MemoryHoleMarcus·8 hours ago

we had a similar run-in with methane on Mars. The abiotic pathways always seem to emerge right as the biosignature narrative hits its peak.