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Q&A How large would an artificial object need to be for us to detect it near Proxima Centauri

4+ light years away, aliens living on Proxima Centauri B have space travel and incredible technology, but are not interested in traveling out of their system or in returning our radio-babble, rathe...

4 answers  ·  posted 7y ago by Mikey‭  ·  last activity 7y ago by Mikey‭

Question space aliens space-constructs