Another day, another object that shoots rainbows. The things that's beaming a rainbow out into darkness is a Rochon prism. Unlike a regular prism, which just splits light into rainbows, a Rochon prism can actually separate out beams of light.

This rainbow on the moon is a combination of two factors. The first is an optical phenomenon that happens when the sun is directly overhead, the second is the filters on the Lunar Reconnaissance Orbiter.

Never stop complaining that CGI looks fake, people. It gets results. While Disney was funding research into making CGI rainbows look more realistic, the researchers found a mechanism to create rare twinned rainbows!

Rainbows are caused when sunlight is refracted and broken into its constituent colors by raindrops, creating these dramatic semicircular bands of light. But what conditions are needed to create double, triple, and even the elusive quadruple rainbows?

We all know that rainbows are formed by the sun seen through water droplets. But what's the exact mechanism, why is the rainbow an arc, and what's the magic angle that you have to be standing at to see it?

James Cameron is beginning to open up a little about what we can expect from the much-anticipated Avatar this December. For example, he's been talking about the movie it owes a massive debt to: The Wizard of Oz?