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