Every year, the night sky grows brighter, and the stars look dimmer. A new study that analyzes data from more than 50,000 amateur stargazers finds that artificial lighting is making the night sky about 10% brighter each year.
WASHINGTON - Every year, the night sky grows brighter, and the stars look dimmer.
“We are losing, year by year, the possibility to see the stars,” said Fabio Falchi, a physicist at the University of Santiago de Compostela, who was not involved in the study. The 10% annual change “is a lot bigger than I expected - something you'll notice clearly within a lifetime,” said Christopher Kyba, a study co-author and physicist at the German Research Centre for Geosciences in Potsdam.
The study data from amateur stargazers in the nonprofit Globe at Night project was collected in a similar fashion. Volunteers look for the constellation Orion - remember the three stars of his belt - and match what they see in the night sky to a series of charts showing an increasing number of surrounding stars.
More than half of the new outdoor lights installed in the United States in the past decade have been LED lights, according to the researchers.
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