When they look at sky brightness—what they call the sky background—they use a unit of brightness per area of the sky: how much light is spread out over a given parcel of celestial real estate.
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Zac Efron and a host of celebrities reveal the efforts of individuals and organisations around the world that have made it their mission to help clean up our planet ...
The extent to which actual cleaning happened is debatable ... kids to work while Babyface or perhaps SWV or Usher jams in the background? It seems like such a cool, simple aspect of life that ...
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