WTF Fun Fact – National Radio Silence Day

In late August, 1924, Mars entered an opposition closer to Earth than at any time in recent history. In the US, a “National Radio Silence Day” was created for a 36-hour period with all radios quiet for 5 minutes every hour in order to listen for radio signals from space. None were heard. – WTF Fun Facts

Source: Search for extraterrestrial intelligence – Wikipedia

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