To date, our serious searches for extraterrestrial life have been done almost entirely:

Question

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Our serious searches for extraterrestrial life have been done almost entirely with radio telescopes. These searches include projects such as SETI (Search for Extraterrestrial Intelligence) which scan the cosmos for any traceable signals or patterns that may suggest intelligent life beyond Earth. Our serious searches for extraterrestrial life have been done mostly with radio telescopes, such as the Search for Extraterrestrial Intelligence (SETI) program, which scans the sky for radio signals that might come from an intelligent civilization. While other methods, such as using optical telescopes to look for signs of nuclear tests, or using infrared telescopes to search for evidence of greenhouse gases, have been proposed, the use of radio telescopes has been the most widely employed method to date.

To Date, Our Serious Searches for Extraterrestrial Life Have Been