Discussion
Which of the following information are the maps showing sky brightness additionally furnishing ?
Answer: C
The maps additionally furnish the growth of light pollution in developed urban areas and densely populated areas (C).
The last paragraph says the maps of calculated sky brightness "provide a vivid record of growth of light pollution in both developed urban areas and densely populated areas". That is what the maps add to the satellite images.
The scattering of light by air molecules (B) is part of the physical model used to calculate the maps, not information they furnish. The effect on the night sky (A) is what the satellite images do not give directly. Light beamed upward (D) is what the satellite images themselves measure.
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