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Nearly two-thirds of the world's population live under night skies polluted by light.
In most heavily urbanized regions, it no longer really gets dark because of street lamps, security lights, searchlights, office lights and neon signs.
In a natural night sky, someone looking at the heavens with the unaided eye should be able to see nearly 3,500 stars and planets and the glow from the Milky Way, our home galaxy.
But in large cities, the number of visible stars has fallen to a few dozen.
This stunning drop has made it impossible to grow up being exposed to the natural beauty and inspiration of the night sky.
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What about motion that is too slow to be seen by the human eye? That
problem has been solved by the use of the time-lapse camera. In this one,
the shutter is geared to take only one shot per second, or one per
minutes, or even per hour depending upon the kind of movement that is
being photographed. When the time-lapse film is projected at the normal
speed of twenty-four pictures per second, it is possible to see a bean
sprout growing up out of the ground. Time-lapse films are useful in the
study of many types of motion too slow to be observed by the unaided,
human eye.
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