There are many ways of categorizing explanations for the apparent paradox. One is to focus on actions: what we think the extraterrestrials are doing, and what we are doing. Another is to concentrate on the intentions of each civilization; many explanations rest on assumptions about the behavior of alien societies, which, in turn, rest on analogies with our own. We could classify explanations by technological capabilities, ours and theirs; or we might do as some authors have done, mixing these approaches.
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