HOW TO CONTACT EXTRATERRESTRIAL INTELLIGENCE
Ronald N. Bracewell
Space, Telecommunications and
Stanford, CA 94305
Copyright: Stuart Kingsley
Microwave and optical (both infrared and visible) radiation are the basis for the principal plans in use or under discussion for advanced extraterrestrial societies, but we should be on the alert for alternative modalities that might contribute. Among the latter are other forms of radiation, matter transfer, and a variety of exotic suggestions.