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.

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. – Space