Only two other parks in the world, one in Pennsylvania, the other in Utah, have been recognized by the International Dark­Sky Association, a US­based organization that seeks to preserve the darkest corners of the Earth. To earn dark sky park status, officials will submit digital photographs of the night sky taken through a fisheye lens(超广角镜头). Their application must also be supported by readings from light meters at different points in the park.

　　In 1989, the British Astronomical Society set up a group called the Campaign for Dark Skies to highlight the growing issue of light pollution. With increasing urbanization come better­lit streets, roads and buildings, which send light needlessly up into the sky, hiding all but the brightest stars. According to some estimates, the amount of light sent into space costs around $110 million a year.

　　“If you go out in an urban street and look up at night, you might see 50, maybe 100 stars at best. But come to our park and when you look up, there are so many stars you can't count them. You can see shooting stars, satellites and the Milky Way, with its billions of stars. You don't even need a high­powered telescope: a pair of binoculars is brilliant，” said Keith Muir, an official at Galloway Forest Park.

　　Steven Owens, a British astronomer, also said, “We've become a very urban population, and in doing so we've cut ourselves off from experiences people have had for hundreds and thousands of years.”

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