Molecular clouds are the birthplaces of stars.

Scientists believe that there are billions of icy objects in the Oort clouds.

I saw a beautiful display of iridescent clouds in the sky.

The architect used revision clouds to highlight the changes made in the design.

She always has her heads in the clouds.

The brown clouds covered the entire sky.

There are dark clouds on the title of the book.

Scientists have recently discovered the existence of Kordylewski clouds in space.

Nacreous clouds are a rare type of cloud formation that occur in the winter polar stratosphere.

Roll clouds are a type of cloud formation that appears as a long, horizontal tube or roll.