Video: Have astronomers discovered an alien mega-structure?

Video: Have astronomers discovered an alien megastructure?

Video: Have astronomers discovered an alien megastructure?
Video: Have astronomers discovered an alien megastructure?

Astronomers have spotted an object in space that blocks a surprising amount of sunlight, leading to speculation it could be a massive structure built by aliens. CBS News science contributor Michio Kaku spoke to CBSN about the enormous discovery.

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