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In 1977, a signal was picked up at a radio telescope that was very strong only observed once and its location couldn't be identified.

Fast forward to 2020.
https://phys.org/news/2020-11-amateur-astronomer-alberto-cab...
In this new effort, Caballero reasoned that if the source was some other life form, it would likely be living on an exoplanet—and if that were the case, it would stand to reason that such a life form might be living on a planet similar to Earth—one circling its own sun-like star. Pursuing this logic, Caballero began searching the publicly available Gaia database for just such a star. The Gaia database has been assembled by a team working at the Gaia observatory run by the European Space Agency. Launched back in 2013, the project has worked steadily on assembling the best map of the night sky ever created. To date, the team has mapped approximately 1.3 billion stars.
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