Why is the sky sometimes gray?
Sky's Gray Blanket
Why is the sky sometimes gray?
You look up, and instead of blue, the sky is gray — flat, soft, like someone pulled a blanket over the world. What happened to all that color?
On a clear day, sunlight travels straight through the air to your eyes. Air molecules are tiny — way tinier than the wavelengths of light — so they scatter blue light in every direction. That's why the sky looks blue: you're seeing blue light bouncing around everywhere.
