Multiple choice general knowledge science & technology

In what year did David Todd convince the US Armed Services to listen for Martian radio communications?

  1. 1924

  2. 1972

  3. 1890

  4. 1971
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A Correct answer
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.

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