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Science and Technology: Electronics, Chemistry, and Space Exploration
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In what year did David Todd convince the US Armed Services to listen for Martian radio communications?
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A
1924
💡 Explanation:
In 1924, during a close approach of Mars, astronomer David Todd convinced the US military to maintain radio silence to listen for potential signals from Mars - one of the earliest SETI attempts. The 1970s dates are too late for this historical event.