Alien greetings? Canada finds recurring radio waves 1.5 billion light-years away – Sina.com

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  1. Alien greetings? Canada finds recurring radio waves 1.5 billion light-years away
  2. Alien greetings? Canada discovers repetitive radio waves over 1.5 billion light-years – Science cnBeta
  3. Alien greetings? Canada finds recurring radio waves 1.5 billion light-years away – News News News
  4. People discover 1.5 billion light years from repetitive radio waves or foreign space ships
  5. Alien greetings? Scientists discover repetitive radio waves beyond 1.5 billion light years
  6. Check out the full story on Google News

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