The skies over Europe recently took on a dramatic orange hue, leaving many residents staring in awe and sometimes confusion ...

Sahara dust colors the evening sky, glittering crystals shimmer in detail – This week, our gallery photographers once again show diversity.

Paleoclimate and archaeological evidence tells us that, 11,000-5,000 years ago, the Earth's slow orbital 'wobble' transformed today's Sahara desert ... of wind-blown dust preserved in deep-sea ...