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.
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.
