Detecting life’s influence on planetary atmospheres

An artist’s impression of a habitable exoplanet. Seasonal changes and the presence of disequilibrium gases in such a planet’s atmosphere could indicate the existence of life there.

Biosignatures that vary in time and atmospheric gases that shouldn’t exist without life to replenish them could be two possible ways to detect life on exoplanets. Finding any life that might exist on other planets is extremely challenging. Even in our own Solar System, where we can send probes and orbiters to

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