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…

Source: https://www.youtube.com/watch?v=j5UHULLK1sY&feature=youtu.be&fbclid=IwAR16KzEuuvoHoZjdhOih-UjHXAS-za5MvJNUPHrgACYBsVsyOpoD6CIOUFQ