If there’s anyone out there on some exoplanet, they very likely can see Earth. We are detectable by over 2000 star systems, according to astronomers. Here’s more from Astronomy Now:
Lisa Kaltenegger, professor of astronomy and director of Cornell University’s Carl Sagan Institute, and Jackie Faherty, an astrophysicist at the American Museum of Natural History, scoured stellar motion and position data collected by the European Space Agency’s Gaia spacecraft to identify stars that are, have been or will be roughly aligned with the plane of our solar system, allowing transits to be seen…. They found 1,715 star systems within 326 light years that could have spotted Earth over the past 5,000 years using the transit method and another 319 that will move into the proper orientation over the next 5,000 years.
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