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Above we considered the very real possibility that we're the only high-tech civilization in our Universe. Let's spend the rest of this chapter exploring this scenario, and the huge moral responsibility it entails. This means that after 13.8 billion years, life in our Universe has reached a fork in the road, facing a choice between flourishing throughout the cosmos or going extinct. If we don't keep improving our technology, the question isn't whether humanity will go extinct, but how. What will get us first--an asteroid, a supervolcano, the burning heat of the aging Sun, or some other calamity