In 2020, scientists detected phosphine in Venus's atmosphere, suggesting potential life; however, controversy remains over its true presence and implications for extraterrestrial biosignatures.
The detection of phosphine on Venus initially appeared as evidence of life, but decades later, scientists continue to debate its existence and possibility of biogenic origins.
Peter Vickers emphasizes the challenge of the 'problem of unconceived alternatives,' highlighting the difficulty scientists face in ruling out all nonbiological explanations.
As hopes rise for biosignature detection in exoplanets, skepticism remains; scientists question whether gases can ever provide conclusive evidence of alien life.
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