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