When enough water droplets form and cluster together, a puffy cloud forms. But how do the water droplets get there?

How can astronomers pierce through the interstellar fog of the Milky Way—not to study distant objects, but to understand the ...

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.