The Arecibo Radio Telescope, 305m in diameter, in Puerto Rico, has received a signal of possible alien intelligent origin three times: the “SHGb02+ 14a”; it is a signal in the vicinity of the famous hydrogen frequency of 1420 MHz, with a Doppler component, therefore emitted from the surface of a rotating body that cannot be (due to the period) either the Earth or an artificial satellite; the point of origin is not associated with visible stars and is located between Pisces and Aries, about 1000 light years from Earth.
