PBS web series ‘Space Time’ recent episode features the concept of ‘Dyson Spheres’ as popularized by Freeman Dyson in his 1960 paper “Search for Artificial Stellar Sources of Infrared Radiation”

The Kepler telescope recently noticed a strange partial eclipse that some have speculated could be a Dyson Sphere. Are Dyson Sphere’s possible? Are they practical? What other alternatives to futuristic energy capture do we have to choose from? Why not a kugelblitz – a swarm of black hole powered engines?