The sun sets over Paranal Observatory in this beautiful space wallpaper, painting an array of subtle hues across the sky reminiscent of a Monet landscape. The sparse clouds glow warmly under the ...

Several rainbow clouds have been spotted in the sky above New Hampshire in recent days.The sightings left many pondering the story behind the clouds.The scientific term for the beautiful cloud ...

It was beautiful.' Atmospheric optics expert ... stretching and contracting in the semi-dark sky. Nacreous clouds, or mother-of-pearl clouds, form in the very cold regions of the lower ...