Mass star-spotting experiment to investigate light pollution in Sweden

Street lamps, illuminated signs and buildings – lights at night improve safety and make cities more attractive, but have also been shown to have negative effects for humans and animals. The more light there is, the fewer stars you can see in the night sky. In this year’s mass experiment, more than 11,000 pupils, families and other members of the public will help scientists measure light pollution by counting stars in the sky.

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