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Science. 1960 Jun 3;131(3414):1667-8.

Search for Artificial Stellar Sources of Infrared Radiation.

Abstract

If extraterrestrial intelligent beings exist and have reached a high level of technical development, one by-product of their energy metabolism is likely to be the large-scale conversion of starlight into far-infrared radiation. It is proposed that a search for sources of infrared radiation should accompany the recently initiated search for interstellar radio communications.

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