Check out this beautiful photo of nacreous clouds, also known as rainbow clouds, from southern Indiana. Here's how the ...

The ring will remain visible as long as cirrus clouds create a veil across the ... Halos are often confused with lunar coronas, but the latter are rainbow-colored discs that form when moonlight ...

Imagine soaring above a layer of clouds and suddenly ... than those required for a complete rainbow. The result of this is a series of concentric, colorful rings that look like a prismatic halo ...