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“Our  galaxy may be teeming with technologically active life or populated by a single very long-lived civilization. In either case, we should be incredibly lucky to get a detection one day,” wrote physicist Claudio Grimaldi in an email to The Daily Galaxy about the possibility of there being a fundamental flaw in why we have not received a signal from an advanced alien civilization. 

How would we decode such a signal? What if alien species communicate chemically? Will they use the language of math and science, or signaling at 1420 megahertz, which is naturally emitted by hydrogen, the most common element in the universe? What if a message or the technology of its signal is beyond our comprehension?. What if it’s a message from a long extinct civilization?

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