"Why is the sky blue?" is a classic query posed most often by curious young children, and unlike the many other grand mysteries of our universe, we know the answer to this one, thanks to a ...

In the spring and summer, you’re more likely going to see a light blue sky. Sometimes, it’s kind of a milky appearance, and some days, it can be so light it almost looks white.

Colors with extremely short wavelengths, like violet and blue, scatter out much easier due to their short wavelengths. This “scattering” effect is what creates our color in the sky!

When the Sun is high in the sky, this is why the entire sky is blue. It appears a brighter blue the farther away from the Sun you look, because there's more atmosphere to see (and therefore more ...

Back to Article List The sky isn’t just blue — airglow makes it green, yellow, and red too The sky looks blue on a sunny day. But at night, we can see the faint glow of its true color.

I was in Windows On The World the day before 9/11. It took me two years and folding a thousand origami cranes before I could write this essay; it's taken another 18 years for it to be published.

The color blue is all around us, but where does it come from? In Blue, written by Nana Ekua Brew-Hammond and illustrated by Daniel Minter, the answer is as deep as the sea and wide as the sky.

Spectacular blue spiral light from SpaceX rocket captured on video A spectacular spiraling blue light was captured in the sky from fuel off the SpaceX Falcon 9 rocket on Monday.