A satellite map of light pollution in the United States shows the country split down the middle, with nearly everything to the east full of light and broad swaths of the west still dark. The Interstate 35 corridor forms the boundary between the two; immediately west is the Hill Country. “We call it ‘the edge of night,’ because you have dark skies that are close to very populated cities,” says IDA board member Ken Kattner, a Houston lawyer and amateur astronomer who is leading an effort to curb light pollution in the area. “If we don’t do something now, we’re going to lose that forever.” Read more from Texas Monthly