Look up and you see the colour that defines our world. At least, our world today. It’s a blue that blankets us from birth to death. It’s even visible from space. In February 1990, the Voyager 1 space probe, six billion kilometres away in the outskirts of our solar system, turned its camera back towards home and captured a fleeting blue speck barely a few pixels wide. “That’s here,” Carl Sagan wrote of the spec in 1994. “That’s home. That’s us. On it everyone you love, everyone yo...
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