Why alien 'megastructures' may hold key to making contact with extraterrestrials - discu.eu

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Why alien 'megastructures' may hold key to making contact with extraterrestrials https://www.nbcnews.com/mach/science/why-alien-megastructures-may-hold-key-making-contact-extraterrestrials-ncna994996 4 comments 20/4/2019 space