Regarding alien life and search for it, I have really big problem with concept of Dyson Sphere/Swarm. The moment when human race will be able to build such megastructures, it is very likely that long time before that fusion generators will be about as common as a smart phone and probably with a same size.
Furthermore matter is just condensed energy, so why bother with some wonky immobile megastructure when you can just decay your everyday trash into pure energy.
Furthermore matter is just condensed energy, so why bother with some wonky immobile megastructure when you can just decay your everyday trash into pure energy.