Global light pollution is drowning out Orion and other constellations in many parts of the world—and it’s getting worse every year.
people see it as a cosmic hearth. For the Khoisan people of southern Africa, it’s an archer confronting zebras and a lion. Meanwhile the Carib people of South America see a one-legged hunter named Epietembo. But future generations might wonder what all the fuss was about. According to a new study analyzing citizen scientist reports, global light pollution is drowning out Orion and other constellations in many parts of the world—and it’s getting worse every year.
The most pervasive form of light pollution is skyglow, the background glimmer of photons emitted by streetlights, billboards, storefronts, and countless other human sources. Although handheld detectors can measure skyglow above any one location, scientists have so far struggled to quantify its full extent.
To come up with a more accurate figure, Christopher Kyba, a physicist at the GFZ German Research Centre for Geosciences, turned to a trick older than the oldest book: stargazing. He teamed up with Globe at Night, a citizen science project run by the National Optical-Infrared Astronomy Research Laboratory. For more than a decade, Globe at Night has asked participants around the world to describe the stars and constellations they can see with their naked eyes.
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