None of the discovered exoplanets can support an Earth-like biosphere


According to a new study published today in the form of a diverse and fertile biosphere in plants, animals and microorganisms, none of the Earthlike class of Exploonets as we know them have the right conditions to sustain life. Week. A week after the Royal Astronomical Society’s monthly announcements, reported on Monday.

In this study, researchers from the University of Naples examined the framework conditions for the production of photosynthesis on ten exoplanets in the Earth segment, which, according to Airpress, are in the habitable zone around stars they are orbiting.

What is the living area

The so-called habitable zone is the optimal distance to the star, so water can be liquid – a prerequisite for survival as we know it on earth. However, researchers concluded that the existence of an Earth-like planet in this habitable zone is not a sufficient requirement for a biosphere.

Photosynthesis requires a certain amount of sunlight for the life-giving process that enables plants and microorganisms to convert light into organic matter and oxygen into a reaction product. Not all stars can reach this level.

Researchers have calculated how much photosynthetic active radiation (RFA) these planets receive from their stars. RFAs are radiations in the wavelength range from 400 to 700 nanometers that can be used by organisms capable of photosynthesis. They came to the conclusion that there are planets in the orbits of stars that are too cold to supply most of the FRG. For example, a star twice as cold as the sun can provide enough RFA to generate some photosynthetic reactions, but not enough to form a biosphere as complex as Earth.

Kepler-442b, super-earth

One of the exoplanets enrolled in the study, Kepler-442b, orbits the Sun 1200 light-years from the Sun in the Lira galaxy, which is close enough to Germany to support a biosphere. From the research team.

Although the study was only conducted on a very small number of planets, astronomers know enough about the nature of the stars in the Milky Way to understand how rare planets are in the photosynthetic biosphere. Most of the stars in the galaxy are red dwarfs, low-brightness stars with temperatures up to a third that of the Sun – stars that are too “cold” to support photosynthesis in orbiting planets.

“Since red dwarfs are the most widespread stars in our galaxy, the result shows that such conditions that are conducive to the development of complex life forms are much rarer than we expected,” said Professor Giovanni Covon, the coordinator of the study.

For example, 20 of the 30 stars in the immediate vicinity of the Sun are red dwarfs.

But stars that are hotter than the sun aren’t exactly either. Bright stars burn quickly, and even if they produce enough RFA to aid the photosynthetic process on a planet containing carbon and water, complex life forms can still exist before they form on orbiting planets.

“Unfortunately, the range of parameters that enable complex life forms to emerge and develop on a planet does not seem to be very wide,” added Cowan.

Thousands of foreign planes have been spotted in the Milky Way

Astronomers have so far discovered thousands of extrasolar planets in the Milky Way, but little is known about them. From what has been discovered so far, it has not been easy to find planets of Earth size and type in the habitable areas of other stars where water can be kept in a liquid state.

Upcoming missions like the Hubble Space Telescope (JWSD), an alternative to Hubble due to be launched later this year, could reveal more about worlds so distant in the orbit of other stars and the possibility of complex life forms on their surface.


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