Abstract
THE largest microwave radio telescope on Earth, at the Arecibo Observatory of the National Astronomy and Ionosphere Center, will soon have the capability of communicating with an identical radio telescope, if such exists, anywhere in the Galaxy. But such communication assumes some previous agreement between the transmitting and receiving civilizations, or mutual discovery of the chosen radio frequency, bandpass, information rate and each other's location.
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DRAKE, F., SAGAN, C. Interstellar Radio Communication and the Frequency Selection Problem. Nature 245, 257–258 (1973). https://doi.org/10.1038/245257a0
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DOI: https://doi.org/10.1038/245257a0
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