There is a good measure of,
It' s a huge building that encloses almost the entire star,
na looked at the transparent wooden rimless smart glasses,
Civilizations that reach this level should be able to travel easily between stars,
for the use of civilization itself,
Even entire civilizations can live in a Dyson sphere,
One possible way to harness stellar energy is the Dyson sphere,
That' s a Dyson sphere,
Dyson spheres are theoretically possible,
The Dyson sphere is simply,
Then it can be said that it is already a stellar civilization,
second-level civilization,
This also means,
Dyson spheres are like huge structures made up of countless solar sails,
even developed a way to travel faster than the speed of light,
For example, the warp engine technology,
In theory,
can utilize the full energy of the star system in which it is controlled,
If a cosmic civilization can successfully control the Dyson sphere,
The second level is the stellar civilization,
including the energy of other planets, and even stars,
A Dyson sphere will completely enclose
And for the second-level stellar civilization,
For example, you can arbitrarily travel between the Milky Way galaxy with a diameter of about 100,000 light-years,
However, the technological level needs to be sufficiently developed,
is able to exploit the energy in its star system,
Say slowly:
Harvest almost all the energy of stars with high-tech level,