phosphine

Phosphine is primarily discussed within the realms of astrochemistry and planetary science, where it is viewed as a potential biosignature. Its presence in an atmosphere, such as that of Venus, suggests the possibility of anaerobic biological processes, though it can also be produced by extreme geological activity.

As a chemical compound, it is characterized by its extreme toxicity and instability. In industrial or laboratory settings, it is handled with rigorous safety protocols due to its high flammability and the distinctive, pungent odor of decaying fish or garlic that accompanies it.