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Preferred frequency for interstellar communications


MANY scientists believe that intelligent life is common in our Galaxy1–6 and that electromagnetic waves are the most practical means of communication7,8. Even equipment of a terrestrial standard can produce communication within a distance of 100 light yr. Several searches for interstellar signals have been proposed; however, difficulty arises in the selection of technical parameters such as frequency and coding. Among these, the selection of frequency is the most important. We propose here that the 4,829.659-MHz line frequency of the 111→110 rotational transition of formaldehyde is a plausible frequency.

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MORIMOTO, M., HIRABAYASHI, H. & JUGAKU, J. Preferred frequency for interstellar communications. Nature 276, 694–695 (1978).

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