"In our opposed forms of loneliness and self-recognition and recognition of the other, we touched each other often as we spoke; and on shore in explorations of the past, we strolled with our arms linked."

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Since, in the long run, every planetary society 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.

— Carl Sagan