When the plate crystals in cirrus clouds are aligned optimally (i.e., with their faces parallel to the ground), the resulting display is a brilliant spectrum of colors reminiscent of a rainbow.

Before its ruling concerning same-sex marriages, the Fukuoka District Court ordered visitors to remove or cover up anything showing rainbow colors, the symbol for the LGBT rights movement.

Arizona resident Emily Eileen didn't just add a splash of color to her DIY ... In another room, a similar rainbow wall with wider painted stripes leads up to the whimsical cloud mural that Emily ...

A rover got a new view of some peculiar extraterrestrial clouds, flecked in rainbow colors and moving across the Martian sky. Curiosity, a set of NASA's robotic "eyes" on the Red Planet ...