โครงการลดมลภาวะทางแสงที่บดบังแสงดาวยามค่ำ่คืน

One of the life’s great wonders is a starry night. But as artificial lights turn city streets and neighborhoods as bright as day, it’s getting harder to see those stars. That has astronomers, politicians and star gazers looking for ways to reduce light pollution. From Boulder, Colorado, Shelley Schlender reports