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Other answers covered most of it but I would like to bring a couple of points up: As the distance between the radio emitter and the radio receiver increases, the signal will be received from a smaller patch of sky, requiring better telescope resolution (see: radio telescope effective area and solid angle), and also requiring more time to more time to scan ...


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Besides radio, SETI is also searching for signs of artificial technology in data from infrared (space) telescopes. The idea is that civilizations make good use of energy, and solar energy is the most abundant and easy to access. Fusion power for free. Fissile elements are mostly inaccessibly hidden deep inside planets. If a civilization absorbs a substantial ...


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What signals do SETI receive? SETI uses radio telescopes to look at large portions of the sky across a range of wavelengths. They believe that we are most likely to find alien civilisation buy looking for microwaves. How would we know if they were from aliens? There are radio signals from many different sources bouncing around the universe, many of which we ...



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