At first glance, it seemed to be merely a photograph of a quarter moon in the night sky. What made the picture remarkable was that it actually showed a quarter earth, reflecting sunlight in the dark lunar sky. It was the first photograph of earth ever taken from deep space, and it was shot by Lunar Orbiter 1 from a point only 27 miles above the surface of the moon. Clearly visible in the foreground was part of the lunar surface marked by its familiar craters. But most of the visible portion of...
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