Controversial 'arsenic life' paper retracted after 15 years - but authors fight back
The journal Science retracted a controversial paper claiming a microorganism can thrive on arsenic, citing new criteria that question the validity of reported experiments.
Doubts grow about the biosignature approach to alien-hunting
Phosphine detection on Venus remains controversial and raises questions about biosignature evidence for alien life. Exoplanet atmosphere studies face similar challenges.