This increased distance causes even more blue light to scatter, allowing the red and yellow hues to pass directly to your eyes. The color of the sky depends on the composition of the atmosphere.

It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something ...

The animal's eyes change from a golden colour to a deep blue as summer fades to winter ... making reindeer vision perfectly adapted to its unforgiving habitat. From ocean to sky, blue is seemingly ...