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How to recognize transmissions from alien life?
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[QUOTE="Klystron, post: 6367924, member: 614295"] Pardon the contradiction but scientists, engineers and tech knowledgeable people certainly knew we were broadcasting/leaking electromagnetic signals off planet. Literature including science fiction and popular electronic publications abounds with 'First Contact' stories. I worked with several scientists and engineering managers from NASA's SETI programs. We often discussed 'signal to noise' [URL='https://en.wikipedia.org/wiki/Signal-to-noise_ratio']SNR[/URL] difficulties detecting intelligent signals from background noise including natural radio sources. Speculating that alien civilizations can learn about Earth cultures by analysing old television broadcasts can be fun to imagine, but outsiders are more likely to detect heavy pulsed radar transmitters, particularly outside the Earth's magnetosphere. One publication described searching for 'traffic control transmissions' alongside actual communication attempts; assuming advanced civilizations even use EM transmitters. [/QUOTE]
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How to recognize transmissions from alien life?
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