Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds.

Since, in the long run, every planetary... | Carl Sagan

Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. - Carl Sagan


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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.. If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds. Carl Sagan

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