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In recent months we’ve been looking at science writer Matt Williams’s coverage of the many reasons (links below) people have advanced as to why we do not see extraterrestrials except at the movies. Last Saturday, we considered the Aurora Hypothesis: Given the difficulties and risks of space travel, extraterrestrials with advanced technology may have visited Earth only one in a million years, researchers say.

Another hypothesis that Williams has examined is the Dark Forest Hypothesis. He begins by noting that space exploration necessarily conjures up the notion of risk: “Words like Rim, Edge, Fringe, and Verge, Beyond, Perimeter, and Periphery all conjure up feelings of intrigue and anxiety – no doubt, in different measures for different people”:

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