1.   A nearly full moon left the sky dark blue at midnight and turned the Detroit River into a shimmering silver ribbon at the edge of the city.

2.   Fire vehicles rushed about, the skies dark with thick plumes of white smoke and helicopters occasionally whirring overhead, carrying huge buckets of water.

3.   Sand dunes dip away into a Louisiana sky dark with summer thunderstorms.

4.   Isidoro Cardenas sat on a hill watching billowing smoke turn the sky dark.