Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Surprisingly, city lights make this task quite possible. The above picture is actually a composite of over 200 images made by satellites orbiting planet Earth. Operational Linescan System. The DMSP satellites continue to help in the understanding and prediction of weather phenomena as well as provide key information about population patterns , city light levels , and even forest fires .
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