PALE BLUE DOT

In 1990, Carl Sagan persuaded NASA to use the Voyager 1 spacecraft to take a photograph of the planet Earth from a distance of 4 billion miles. The result was simply arresting: a portrait of our home as a tiny, fragile speck of blue adrift in an unimaginably vast sea of space. In a commencement address for the public release of the photograph, astronomer Sagan offered these profound words:

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