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The night sky is light colored and stars are black. Lights appear at night and stars are seen in the dark. City lights illuminate the night sky and make stars invisible. City lights at night illuminate stars in the sky.
Glass is very useful because it has many unusual qualities. Light signals have changed the use of glass in industry. Glass fibers have reduced the cost of telephone communication. The use of glass fibers to carry telephone messages is an interesting new development.
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The night sky is light colored and stars are black. Lights appear at night and stars are seen in the dark. City lights illuminate the night sky and make stars invisible. City lights at night illuminate stars in the sky.
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artificial lights illuminate the night sky. the moon lights up the night sky. too many stars are visible in the night sky. streetlights are turned off.
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When they have a fairly good telescope. When they are in a large city. When the night sky is clear of clouds, moonlight and artificial lights. When the night sky is without haze and fo
Glass is very useful because it has many unusual qualities. Light signals have changed the use of glass in industry. Glass fibers have reduced the cost of telephone communication. The use of glass fibers to carry telephone messages is an interesting new development.
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A haze of light is formed from artificial lights such as streetlights and building lights. Lights from different sources in the city stream into space and illuminate the night sky. The night sky is illuminated by the lights from big glowing cities in the night. Stargazing becomes difficult because there is a layer of haze in the air.
the night sky there is too dark. the once dark areas are also polluted by lights. these areas are not polluted by chemicals. these areas are less developed.
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150 stars. hundreds of stars. one thousand stars. more than 14,000 stars.
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the night sky is brightly lit up and stars are black. lights appear at night and stars are seen in the dark. city lights at night illuminate stars in the sky. city lights illuminate the night sky, making stars invisible.
Animals may go off course due to the attraction of artificial lights. Animals might be attracted by artificial lights to go into cities. Artificial lights at night may make migrating birds lose their way. Attracted by artificial lights, birds fly into lighted buildings.
Animals may go off course. It helps migrating birds find their homes. Animals are afraid to go out after sunset. It helps birds fall asleep.
A haze of light is formed from artificial lights such as streetlights and building lights. Lights from different sources in the city stream into space and illuminate the night sky. The night sky is illuminated by the lights from big glowing cities in the night. Stargazing becomes difficult because there is a layer of haze in the air.
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