Nitrous oxide could act as a biosignature in the atmospheres of exoplanets and be detectable by the James Webb Space Telescope.
where ocean conditions would have allowed for much greater biological release of N2O," said Schwieterman. He is referring to periods during the Proterozoic Eon, which lasted from 2.5 billion years ago to 540 million years ago. The Proterozoic Eon ranges from the the time when Earth's atmosphere became
to the first appearance of complex life."Conditions in those periods might mirror where an exoplanet is today," Schwieterman added.have an advantage because M-dwarfs don't release the copious radiation that the Sun does which can break down nitrous oxide molecules. There are physical processes that can also produce nitrous oxide, such as lightning sparking chemical reactions with molecules in the atmosphere. However, lightning also creates nitrogen dioxide, so the presence of both nitrous oxide and nitrogen dioxide in similar abundances in an exoplanet's atmosphere would be a dead giveaway that a planet is stormy, rather than inhabited.
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