Slushy hailstones of ammonia and water were part of a bizarre theory to explain the planet's poorly mixed atmosphere. These mushballs seem to be real, say UC Berkeley scientists.

In China’s Tarim Basin, spring brings fierce dust storms fueled by dry landscapes and shifting winds. NASA satellites ...

Our morning marine layer is creating overcast skies and coastal drizzle to begin Thursday. Sunshine will be slow to appear this afternoon. Cooler-than-average highs continue in the upper 50s to ...