"Viewed from the distance of the moon, the astonishing thing about the earth, catching the breath, is that is is alive. [Neil Armstrong's] photographs show the dry, pounded surface of the moon in the foreground, dry as an old bone. Aloft, floating free beneath the moist, gleaming, membrane of bright blue sky, is the rising earth, the only exuberant thing in this part of the cosmos….. It has the organised, self-contained look of a live creature, full of information, marvellously skilled in handling the sun."
Lewis Thomas (quoted by Simon Winchester in "A Crack in the Edge of the World")