by REBECCA BOYLE
Chicago glows through a blanket of clouds. PHOTO/Jim Richardson/National Geographic
An eternal electric day is creeping across the globe, but our brains and bodies cannot cope in a world without darkness
Sound dominated my senses as we left the village of San Pedro de Atacama and walked into the desert night. The crunch of shoes on gravel underlay our voices, which were hushed to avoid waking any households or street dogs. Our small group of astronomy writers was escaping from light and, without any flashlights or streetlamps, we struggled to see, so our other senses were heightened. Land that looked red by day was now monochromatic, the rods in our retinas serving as our only visual input.
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To most people who have travelled outside the developed world – whether to camp or to meditate or to hunt – such bright and plentiful stars are a glorious sight. But this beauty instilled in me a creeping sense of guilt. At home, 1,500 miles north, I wouldn’t recognise such spangled heavens. From where I live in the American Midwest, the stars might as well not exist. After journeying millions of years, their light is swallowed by city glare and my porch lantern. Those that make it through will still fail: not even bright Betelgeuse can outshine my iPhone. Yet I am an astronomy writer, a person who thinks about stars and planets all the time. What does my neglect of the night sky say about the rest of humanity?
‘We are all descended from astronomers,’ the astrophysicist Neil deGrasse Tyson intones in the rebooted version of the TV show Cosmos. This is as poetic as it is true. Everyone owns the night sky; it was the one natural realm all our ancestors could see and know intimately. No river, no grand mountain or canyon, not even the oceans can claim that. But since Edison’s light bulbs colonised our cities, the vast majority of humans has ceased to see those skies. More than 60 per cent of the world, and fully 99 per cent of the US and Europe, lives under a yellowy sky polluted with light. For many of us, the only place to see the milky backbone of our own galaxy is on the ceiling of a planetarium. Although humans are diurnal, factories and Twitter and hospitals and CNN are not, so we must conquer the darkness. As a result, almost everything industrialised people build is lit up at night. Malls, hospitals, car dealerships. Streets, bridges, air and sea ports. Buildings on a skyline. These artificial lights identify our cities all the way from the moon. If aliens ever do drop by, this might be their first sign that someone is home.
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