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Sunday, April 30, 2017

Scientists have figured out near which stars should live aliens

A group of American astrophysicists have figured out which groups should relate to the emergence and development of life on the planet surrounding them was the most likely. According to the researchers, these are the so-called main sequence star belonging to spectral class G or K.

photo: pixabay.com

To the spectral class G applies, including the Sun. The temperature of poverchnosti lights from this category is from 5 thousand to 6 thousand Kelvin, the Stars of spectral class K is somewhat colder — the surface is heated to between 3.5 and 5 thousand Kelvin, but they are, as a rule, somewhat larger. The color of the stars, which, according to researchers, are most likely to have habitable planets in its orbit, should be yellow or yellowish orange. As for red dwarf is relatively cool, but the most common in the Universe stars planets around them, according to astrophysicists, can hardly be inhabited.

Among the characteristics that affect the probability of the formation and development of life around stars, the researchers took into account x-ray and magnetic radiation from it, the frequency of superspecies on the surface of the disc and the size of the so-called zone of potential habitability around him. So far, the work of researchers is not published in scientific journals, but their conclusions are presented on the website of preprinted arXiv.org.

Although the only planet in the Universe, in the existence of life on which we may be sure, was and remains the Land, many specialists are of the opinion that living organisms could arise somewhere else in the Universe. In this regard, different theories that would give a person guidelines for a more effective search for extraterrestrial life. Chief among these targets is today considered the habitable zone of stars — the distance from the star where water can exist in liquid form, not freezing and not evaporating. It is assumed that if a planet is to its star closer this zone, it will be too hot for the emergence of life, if then too cold. For this reason, the optimal distance from a star Western experts call the “Goldilocks zone” — in honor of the fairy tale, in Russia, better known in the version called “Masha and bears”.

However, some experts are with the more daring theories — for example that outside of the habitable zone could support life, if it will differ from the earthly fundamental way and exist on the basis of other chemical elements. For example, recently a group of researchers from Cornell University suggested that on Titan, a moon of Saturn, there may be forms of life, in which the water role played by organic molecules polyimide.

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