Comment by mcrider

Huh, I'd be curious to see that source. I know he somewhat recanted the idea of a Dyson sphere, as it is completely impractical even with unimagined technology (re: tensile strength of the materials, and preventing such a megastructure from falling into the sun whenever a rock hits it). But he later proposed the idea of a Dyson swarm, an extremely large array of solar-sucking satellites orbiting the sun as an idea that's theoretically possible even with today's technology.