Seasonal changes in the atmosphere of the exoplanet may indicate the presence of life

By now, scientists have discovered many potentially inhabited planets located outside the solar system, and even more exoplanets have yet to be discovered.
Is there life on these planets?
The search for life on exoplanets, to which no modern spacecraft is capable to fly, will begin with the search for the products of the life activity of organisms in their atmospheres. These products will be observed in the atmospheres of exoplanets using new generation telescopes that will measure the composition of the gas shells of the worlds located several light-years away from us.
However, these measurements may not give the desired result, since it is unlikely to unambiguously establish the presence or absence of life on the planet with the help of atmospheric composition alone. To complement these dimensions in the new work, researchers from the NASA Astrobiology Institute, led by Stephanie Olson, suggest a new method of tracing life, according to which the seasonal changes in the composition of atmospheric gases on exoplanets should be measured. On Earth in the Northern Hemisphere, in which most of the planet’s vegetation is concentrated, the amount of oxygen in the atmosphere increases in the summer and carbon dioxide decreases, and in winter – on the contrary. Scientists propose to use this property of the atmosphere, conditioned by the presence of life, to increase the probability of detecting life and reduce the likelihood of false detection of life on the surfaces of distant planets.

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