Lights out : city lights are erasing the stars, wasting energy, and hurting wildlife. Find out what's being done to darken the night.(PHYSICAL LIGHT POLLUTION)

Science World | April 2, 2007| | Copyright

A century ago, stargazers could look up and see a black sky speckled with 2,500 or so twinkling stars. They could easily make out the broad cluster of stars called the Milky Way galaxy, home to our solar system. Today, only 1 in 10 Americans can see this vision of the universe. And on a typical evening, most city dwellers glimpse just a few dozen stars. An eerie, orange sky blots out the rest.

The switch from dark nights to glowing skies began during the early 1900s, when Thomas Alva Edison invented a long-lasting light bulb that was bright enough to replace dim gas ...

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