|In 1895, Guglielmo Marconi
first used electromagnetic waves on our planet, about 120
years ago. 1901 saw the first transatlantic radio
communication. From 1905 wireless radio traffic was
generally used, thus for 110 years.
In an orbit of 55 light years, all these electromagnetic signals emitted by alien civilizations should have been detected to this day. And if they had answered, their signal would have reached us today. However, this has not yet happened.
The operating time of SETI is now 55 years.
|The english Book is under Construction||176 Sites
84 coloured Illustrations
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