It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something ...
The desert city in southern Arizona is a sanctuary for stargazers—and now it's even easier for visitors to explore.
This Chilean desert became a scapegoat for reckless humans who have no regard for how they affect the natural resources.
Liquid gold sunlight splashed over the desert not long after dawn. Above me, the baby-blue canopy of sky was brushed with the ...