Astronomers have been looking for radio waves sent by a distant civilization for more than 60 years. Rytis Bernotas/iStock via Getty ImagesIf an alien were to look at Earth, many human technologies – from cell towers to fluorescent light bulbs – could be a beacon signifying the presence of life. We are two astronomers who work on the search for extraterrestrial intelligence – or SETI. In our research, we try to characterize and detect signs of technology originating from beyond Earth. These are
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