An experiment carried out at 01:30 every morning for 10 nights has revealed the main sources of artificial light polluting the night sky.
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An experiment carried out at 01:30 every morning for 10 nights has revealed the main sources of artificial light polluting the night sky.
The city of Tucson, in Arizona, US, dimmed its 14,000 streetlights over that period.
"We used a satellite to measure what fraction of the total light emissions are due to the streetlights," explained physicist Dr Christopher Kyba.
Artificial light has been shown to affect our sleep and our health.
"And late at night, when people are sleeping - that is exactly when we can save a lot of energy," Dr Kyba, who is based at the German Research Centre for Geosciences in Potsdam, told BBC News.
His light-from-space experiment, published in the journal Lighting Research & Technology, showed that most of the artificial light wasted - by being sent upwards into space, rather illuminating a sign, street or building on Earth - does not actually come from streetlights, but from other sources.
From BBC news story: https://www.bbc.co.uk/news/science-environment-54721921
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