Rainbows are optical illusions formed from a specific series of refractions and reflections. This is what all goes into making a one.

Can rainbows form in a circle? – Henry D., age 7, Cambridge, Massachusetts The legend goes that there is a pot of gold hidden at the end of every rainbow.

When you see a rainbow, your eyes are at the apex of a cone formed by the light rays that are being reflected by the raindrops that happen to be at a 42° angle from the antisolar point — from ...

MACON, Ga. — A rainbow forms when sunlight enters a raindrop. When this happens, sunlight bounces around the raindrop and changes speed and direction. That's called refraction. These changes ...

The occurrence of a lunar rainbow, a pretty epic view, was documented at Yosemite National Park recently.

How do double rainbows form and what makes them different than the more common regular rainbow? It all comes down to physics.

While rainbows aren't exactly rare, there's still a mystique about them that makes you want to pick up a camera and capture the moment. But why has the Midwest seen such a flurry of rainbows recently?