Abstract
The article reports that according to a research there is expansion in the earth's artificially lit area. Topics include replacement of sodium- vapor technology by LED lamps; information on nasa satellite instrument called the Visible Infrared Imaging Radiometer Suite (VIIRS) which can measure long wavelengths of light such as those produced by traditional yellow-and-orange sodium-vapor street lamps; and views of Fabio Falchi, from Light Pollution Science and Technology Institute, on VIIRS.
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