A Dyson sphere is a hypothetical giant structure that surrounds a star to capture its solar output. Two separate groups of astronomers claim they have detected dozens of possible Dyson spheres within our Milky Way galaxy. NBC’s Gadi Schwartz spoke with Dr. Michio Kaku, theoretical physicist, futurist, and bestselling author of QUANTUM SUPREMACY: How The Quantum Computer Revolution Will Change Everything about what it would take to make a Dyson sphere and how advanced a civilization would need to be to do it. WATCH NOW!