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