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According to scientists, per million stars in our galaxy there is no more than one civilization developed so that we could “hear” her. Given that in the Galaxy about 200-400 billions of stars, which means that in our star system can there are several hundred thousand civilizations. Group American scientists using a radio telescope in Greenbank held an experiment to search for signals of artificial origin and not got no result – however they appreciated the potential the number of extraterrestrial civilizations, according to them, is only one in a million the stars of our galaxy may be home to aliens, says paper accepted in the Astrophysical Journal. Group under Andrew Siemion of the University California to Berkeley from February to April 2011 using 100-meter radio telescope “listened” to 86 stars, next to which according to the Kepler telescope, there were planets similar to Earth. Observations were carried out at frequencies of 1.1 – 1.9 gigahertz, which on Earth Used for cell phones and television. From received data scientists tried to isolate high-intensity signals in a fairly narrow frequency band – not wider than 5 gigahertz, which can only be obtained artificially. “We did not find (signals) aliens, but we were able to use a set of statistics, to first set limits on the number of existing extraterrestrial civilizations that are capable of transmitting in this band frequencies, “said Semyon, whose words are given in the message University. According to scientists, per million stars in our The galaxy has no more than one civilization developed so much so that we can “hear” it. Given that in the Galaxy about 200-400 billion stars, which means that in our stellar the system can exist several hundred thousand civilizations. Scientists note that the level they achieved in the experiment sensitivity would only allow aliens to hear if they consciously directed the signal towards our the planet. However, in the future, with the advent of the giant SKA radio telescope, astronomers will be able to intercept random leaks.
Galaxies
