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