Solar Halos

A solar halo looks like a giant mandala of light in the sky.

Wikipedia says: A halo (from Greek ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by ice crystals creating colored or white arcs and spots in the sky. Many are near the sun or moon but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air.

Here are more cool images collected from various sources:

Images courtesy of Way Cool Pictures, Black Holes and Astrostuff, web biz 2u, Geoff Cloake, Science Photo Library, and elsewhere around the web.