Canadian astrophysicists found 234 cases of what they called "unusual periodic spectral modulations in a small fraction of solar-type stars." The authors call the existence of highly developed civilizations near them as the most probable reason for such behavior of the luminaries. The research preprint is published on the arXiv.org website.
Scientists believe that representatives of civilization deliberately change the light signal so that it is noticed by intelligent inhabitants of other planets and thus learned about their existence. The authors came to their conclusions by analyzing spectral data, mainly the change in light intensity depending on wavelength, about 2.5 million celestial bodies.
The performed statistical analysis of the observation results showed that signals from 234 stars can be generated by highly developed civilizations. On the graphs presented by scientists, such signals have the same periods - 1.65 picoseconds (one picosecond is equal to a trillionth of a second). The properties of such signals, according to the authors, cannot be explained by any instrumental errors or known natural features of the luminaries.
Dependence of the Fourier modulus on the number of components of the discrete expansion (from below - increased)
Image: arxiv.org
It is noteworthy that all unusual signals came from stars of the circumsolar type, belonging to the spectral classes F2-K1. Scientists believe that aliens could receive this kind of radiation using, for example, lasers. Scientists described the characteristics of a signal that could be modulated by highly developed alien civilizations back in 2012.
To search for unusual luminaries, the authors used the SDSS (Sloan Digital Sky Survey) survey. The only, but unlikely, according to the authors of the study, a hypothesis explaining the observed radiation is the peculiar chemical composition in a small fraction of stars in the galactic halo. Scientists note that their findings need to be confirmed in future work.
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