If I am right, there are about as many living planets in the universe as there are planets capable of generating and sustaining life. . . . Even a conservative estimate puts this number in the trillions. Unless this estimate is totally off the mark, we may take it that trillions of foci of past, present, or future life exist. Trillions of biospheres coast through space on trillions of planets, channeling matter and energy into the creative fluxes of evolution. In whatever direction we turn our eyes when we look into the sky, there is life out there, somewhere.
p. 292
Christian de Duve Vital Dust: Life as a Cosmic Imperative
Basic Books, 1995

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