In 1990, after years of lobbying by Carl Sagan, Voyager 1 turned its camera back toward home from about 6 billion kilometres away and photographed Earth as a pale blue speck smaller than a single pixel — an image NASA had repeatedly resisted because it offered little scientific value, but that became one of the most famous photographs ever taken.

On 14 February 1990, the Voyager 1 spacecraft turned its cameras back toward the inner solar system and photographed the planets it had left behind. Among the 60 frames was one that caught Earth: a point of light less than a single pixel across, sitting in a band of scattered sunlight. The image became known [...] The post In 1990, after years of lobbying by Carl Sagan, Voyager 1 turned its camera back toward home from about 6 billion kilometres away and photographed Earth as a pale blue speck s