The closest she had come was the inside of a Dyson sphere.

It is a type of Dyson sphere built around a black hole.

Next thing they'd want to start building a Dyson sphere.

Note that life is not necessarily pleasant in a Dyson sphere.

And we can see the stars, unlike the inhabitants of a Dyson sphere.

The theory is that they have been enclosed inside Dyson spheres.

And it would seem to me that the Dyson Sphere has had enough time.

The surface area inside a Dyson sphere is about a billion times that of the Earth.

The ring is a compromise between a normal planet and a Dyson sphere.

It is inspired by the Dyson sphere, but much harder to detect from another star system.