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Well, after a physicist, and he was a radio astronomer, Nicole I. Kaddash, in 1964, he wrote a paper under class of other types of transmissions and their energies with searching for extraterrestrial intelligence. This was by using SETI. He was based in analysis on a universal scale for looking at civilizations overall, energy consumption, which he placed in three categories, and those categories are type one, stopping. This said we have civilization capable of harnessing all the energy of the planetarium civilization. We're not even there yet. Type two, harnessing the output power of its planet star, likely using the price of the sphere. This is like a mechanical object they have encompassing their energy from the star to the energy from it. This is referred to as a stellar civilization. And the next one is type three, and these are capable of harnessing the power of an entire galaxy. And they're referred to as a galactic civilization.