Any unusual signals coming from stars of the solar type.
Canadian astrophysicists have found 234 cases of what they called “unusual periodic spectral modulations in a small proportion of solar-type stars”. The most probable reasons for this behavior of the stars, the authors referred to the existence in their vicinity of highly developed civilizations.
Scientists believe that the representatives of the civilization deliberately change the signal light in order that it noticed reasonable inhabitants of other planets and thus found out about their existence. To their conclusions the authors came analyzing spectral data, mainly changing the light intensity depending on wavelength, about 2.5 million celestial bodies.
The statistical analysis of the results of observations showed that the signals from 234 stars can be generated by highly developed civilizations. In the graphs presented by scientists, such signals have the same period, of 1.65 PS (one picosecond is equal to trillionth fraction of a second). The properties of such signals, according to the authors, cannot be explained by any instrumental errors or known natural features luminaries.
It is noteworthy that any unusual signals coming from stars of the solar type, belonging to the spectral class F2-K1. To get this kind of radiation, scientists believe that aliens could with, for example, lasers. Characteristics of signal, which could modulate an intelligent alien civilization, scientists have described more in 2012.
To look for unusual bodies, the authors used the survey of SDSS (Sloan Digital Sky Survey). The only, but unlikely, in the opinion of the authors of the study, the hypothesis that explains the observed radiation, is a kind of chemical composition in a small proportion of stars in the galactic halo. Scientists note that their findings need to be confirmed in future work.
