- Alien greetings? Canada has found 1.5 billion light years of repeated radio waves
- Alien greetings? Canada finds repeated radio waves at 1.5 billion light-years away – News News News
- Humans discover 1.5 billion light-years of repeated radio waves or alien ships
- Alien greetings? Canada discovers repeated radio waves beyond 1.5 billion light-years – Science cnBeta
- Alien message? Mysterious transmission of radio waves outside 1.5 billion light years
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