At this critical length the cloud neither expands nor contracts.

Directly ahead of him, only twenty miles away, a vast cloud of dust was expanding toward the stars.

The white cloud expanded, covering every Klingon ship for a moment before vanishing.

A cloud of dust expanded all around it.

The new cloud expanded toward the first, blocking Hamed's view of the river, which met the water at the south end of the park.

Great puffy clouds were slowly expanding up and up, over my head, maybe two feet into the air.

The cloud now expanded very slowly, but still it grew.

But that black cloud on the western rim expanded swiftly.

The cloud had now expanded to cover most of the field, hiding the burning wreckage.

Over thousands of years, the clouds of gas expand away and the nebulae become larger.