ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY
Summer stars and light pollution. View of the night sky over a city, showing how light pollution obscures the stars. This view is of summer stars in the Northern Hemisphere, and was taken with a 10-second exposure. In the city sky, the lights hide many stars, and very few are visible through the reflected glow. More stars are visible when viewed from less inhabited areas such as the countryside or from mountains. For a sequence showing the effects of varying levels of light pollution over the year and in different locations, see images C025/1412 to C025/1423.
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