Alien greetings? Canada finds recurring radio waves of 1.5 billion light-years

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  1. Alien greetings? Canada finds recurring radio waves 1.5 billion light years away from the Xinmin Society Xinmin Net
  2. Alien greetings? Canada finds recurring radio waves of 1.5 billion light-years
  3. Alien greetings? Canada discovers repetitive radio waves over 1.5 billion light-years – Science cnBeta
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