SETI astronomers search for radio signals, mostly from a specific band of the radio spectrum: the frequencies between 1.42 and 1.66 GHz. The millimeter and submillimeter radio bands remain almost completely unexplored for SETI.
An international team of researchers has produced the first sharp radio maps of the universe at low frequencies. Thanks to a new calibration technique, they bypassed the disturbances of the Earth's ionosphere.
