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