Each color transitions smoothly into the next, creating the familiar gradient. In nature, most rainbows exist because of sunlight and rain. When sunlight hits the water droplets in the air ...

Periods of rain alternated with sunshine in Santa Cruz Monday to provide optimal conditions for rainbows, and multiple ...

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.

Hawaii's regular sunshine, short rain showers and clean air come together to create some of the planet's best conditions for viewing rainbows. They're such a frequent sight that a University of Hawaii ...