Blue skies and fluffy clouds as far as Sky View 21 can see! That's what our drone captured for your Moment of Zen this month.

Now that we know white light contains all the colors of the rainbow, it’s much easier to explain why the sky appears blue! Related Content Ask Ellen: How does light travel from the sun to … ...

"Fallstreak holes," also known as "hole punch clouds," which were seen Jan. 7 in satellite images from Indiantown through Miami, can punch clear through to show blue sky, or be more opaque, but ...

Night sky photographer Ruslan Merzlyakov captured bright blue-white noctilucent clouds dancing over Nykøbing Mors in Denmark just before dawn on July 1.

Night sky photographer Ruslan Merzlyakov captured bright blue-white noctilucent clouds dancing over Nykøbing Mors in Denmark just before dawn on July 1.