Humanity never chose to announce Earth to the galaxy—but our Mars missions may have done it anyway. A Penn State analysis of 20 years of NASA communications found that a civilisation watching an Earth–Mars alignment would have had a 77% chance of being swept by one of our deep-space radio beams.
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NASA Deep Space Network logs show that a distant observer on the Earth–Mars line would have occupied one of humanity's Martian uplink beams 77 percent of the time from 2005 through 2024.
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