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