Oxygen not a reliable sign of life after all

RedNova News – Saturnian Oxygen, Without Life
It seems that significant amounts of oxygen ions have been detected in the Saturnian atmosphere, suggesting that the widely held belief that oxygen’s presence must indicate biology is wrong.
Following from what my brother said in my recent entry on Methane and Mars, it does seem that these molecules can have plausible abiotic origins and thus aren’t as reliable detectors of life as once we thought.