Comment by tsimionescu

Dyson spheres (or the more plausible sounding Dyson swarms) are not an actual physically possible thing, they're just a nice sounding sci-fi trope, like teleporters or replicators.

Freeman Dyson invented the concept as a joke against SETI, especially designing it to sound quasi-plausible.

In reality, there is no way to create a stable structure of this size, it would be like trying to balance a building on the top of a pinhead - except the pinhead is a chaotic, unpredictable star. And the amount of energy required to displace multiple planets worth of mass, manufacture some amount of it into complex satellites, and then displace this amount again to a "stable" Solar orbit simply doesn't exist in the Solar system, on any plausible time scale (it would take many thousands if not millions of years worth of solar power to do so).