Gas Found in Venus Atmosphere May Be Sign of Life

The scientists write about their findings at Nature Astronomy:

An ideal biosignature gas would be unambiguous. Living organisms should be its sole source, and it should have intrinsically strong, precisely characterized spectral transitions unblended with contaminant lines—criteria that are not usually all achievable. It was recently proposed that any phosphine (PH3) detected in a rocky planet’s atmosphere is a promising sign of life.