If 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 dete
. But a civilization would need to produce far more heat, light, and satellites than Earth does to be detectable across the vastness of space using technology humans currently possess.No astronomer has ever found a confirmed technosignature, so it’s hard to say what will be the first sign of alien civilizations. While many astronomers have thought a lot about
, ultimately, nobody knows what extraterrestrial technology might look like and what signals are out there in the Universe.approach which searches for anything in space that current scientific knowledge cannot naturally explain. Some, like us, continue to search for both intentional and unintentional technosignatures. The bottom line is that there are many avenues for detecting distant life.
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