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Well, astrophysicist, and he was a radio astronomer, Nicole Ayyam-Kadash in 1964. He wrote a paper on the class of other types of transmissions and their energies when searching for extraterrestrial intelligence. This was by using SETI. He based it analysis on a universal skill for looking at civilizations overall, energy consumption, which he placed in three categories, and those categories are type one, strobing. This is the civilization capable of harnessing all the energy of... ...there's a group of planetary civilizations. We're not even there yet. Type two, harnessing the output power of its planet star. I'm likely using the price of the sphere. This is like a... ...and the logic they have companies in their own... ...and they're starting to track all the energy from it. This is referred to as a stellar civilization. And the next one, a type three. And these are capable of harnessing the power of an entire galaxy. And they're with you referred to as a galactic civilization.