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