Over the past few years, the white clouds that usually shroud Neptune’s surface have disappeared, and it may be because of changes in the sun’s activity over its 11-year cycle ...

Dudás posted his cloud and sheep seek-and-find on social media on Monday, Feb. 27, and many users claim they’ve been able to find all three clouds. On Facebook, Dudás cloud-sheep puzzle has ...

Rare clouds that give off bright, multi-colored light like an aurora were recently spotted at multiple locations in the Arctic. But what causes them?

The luminous halo was created by light reflecting off tiny ice crystals from cirrus clouds — thin and patchy clouds that form between 20,000 and 40,000 feet (6,100 and 12,200 meters) above Earth ...

The white, cloud-like substance turned out to be foam, likely formed due to industrial pollutants. While some viewers were amused, others expressed concern over the environmental implications.

In each case, a single snow or salt crystal is clear or translucent, but the light scattered off all the individual small surfaces appears white when viewed in bulk.