2020 has been a shit year for most of us here on Earth. But it may turn out to be a landmark year for science, and the search for life outside of Earth.

The search for extra-terrestrial life has mostly focused on Mars and the icy moons of the outer solar system.

For decades, the focus of the search for extraterrestrial life has focused on Mars, the outter solar system (such as the moon Titan and Europa), and searching for non-natural radio signals from other stars. But a recent review of data from the Pioneer 13 space probe has revealed that the probe detected one of the tell-tale indications of life in the atmosphere of Venus way back in 1978. The review of Pioneer 13's data was prompted by the recent discovery (by scientists using a land-based telescope) of a chemical called phosphine in the atmosphere of Venus. The findings were published in the journal Nature Astronomy a month ago, on September 14.

Phosphine is a class of gas that can be produced from atmospheric chemistry under high pressure, or as a by-product of anaerobic biology. Phosphine has also been detected in the atmosphere of gas giants such as Jupiter, where the incredibly high pressure and energy of Jupiter's interior atmosphere produces the compound, which then floats up to the upper atmosphere, where it reacts with other chemicals and oxidized (or dissolves). The atmosphere of Venus, however, lacks the higher pressure of Jupiter that would be continually-creating phosphine. As such, the chemical cannot be produced in Venus' atmosphere, in the quantities detected, by the same mechanisms that produce it on Jupiter. Another explanation is required, and the only other known way to produce this type of phosphine is through anaerobic biological processes.

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