A rainbow, cloud bow, morning glories, halo, sun dog (parhelion), or any kind of optical arc in the sky involve some form of water or ice interacting with sunlight. There are a lot of […] ...

But the science behind a blue sky isn't that easy. ... It Takes The Entire Rainbow Of Colors To Make The Sky Blue. Here's Why. Jan Wesner Childs. Updated February 1, 2025 at 11:06 AM.