Are we alone in the universe' The answer is almost certainly no. Given the vastness of the cosmos and the fact that its physical laws allowed life to emerge at least one place'on Earth'the existence of life elsewhere is effectively guaranteed. But so far, despite generations of looking, we haven't found it. In that time, however, we've arguably learned enough to declare that, while we may not be alone, the interstellar gulf between us and our nearest neighbors effectively puts us in an isolation ward. This doesn't mean we should stop looking'only that we should manage our expectations and prepare for a long and lonely voyage through space and time before meeting them, either virtually or physically. The possibility of alien life has been discussed since antiquity. But rigorous searches for it have only been within reach for less than a century, following an approach first proposed in 1959 by physicists Giuseppe Cocconi and Philip Morrison, who showed the feasibility of interstellar...
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