"We are not so much looking for communication in this case, like we are for things within our Galaxy, but for signs that advanced civilizations are manipulating their environments on a very large scale."
"Civilizations capable of such feats are ranked on The Kardashev Scale, which measures energy capture capabilities. Type 1 civilizations can access all the energy of their planet, while Type 2 civilizations can harness the energy of their star."
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