From Ozma to Breakthrough Listen: The Evolution of SETI's Search for Extraterrestrial Signals

To the point

SETI is the ongoing search for signals from extraterrestrial civilizations using radio and optical methods, from Frank Drake's Ozma and his Drake equation to modern programs like Project Phoenix, the Allen Telescope Array, Breakthrough Listen, and SETI@home, with no confirmed transmissions found so far.

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britannica.com

Extraterrestrial intelligence - Radio Searches | Britannica

Extraterrestrial intelligence - Radio Searches: Projects to look for such signals are known as the search for extraterrestrial intelligence (SETI). The first modern SETI experiment was American astronomer Frank Drake’s Project Ozma, which took place in 1960. Drake used a radio telescope (essentially a large antenna) in an attempt to uncover signals from nearby Sun-like stars. In 1961 Drake proposed what is now known as the Drake equation, which estimates the number of signaling worlds in the Milky Way Galaxy. This number is the product of terms that define the frequency of habitable planets, the fraction of habitable planets upon which intelligent life will arise,