The scientists were surprised by their discovery on Venus since only biological mechanisms create this gas. It is most likely being produced by some form of alien microbe.
The microbes on the planet must endure extreme acidity since the clouds are around 90% sulphuric acid. It would be impossible for Earth microbes to survive those levels of acidity.
Phosphine has a phosphorus atom with three hydrogen atoms attached. It was found in trace concentrations of 20 parts-per-billion. That is highly toxic to people.
The discovery of phosphine is a definite sign of life forms that are radically different than those on Earth. In our planet, phosphine is produced by bacteria that thrive in oxygen-starved environments.
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