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After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

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  1. The image taken by astronauts billions of miles away from Earth inspired Carl Sagan's book "Pale Blue Dot," which encourages us to appreciate the fleeting beauty of humanity.