This scatters the blue and green light along the way ... you can see the blue sky fade away to a black background as it climbs above the atmosphere.

Complicated physics makes these molecules scatter more blue light than red ... far removed from humanity’s wasted sky-directed light, that background can be as dim as 22 mag/arcsec 2.

when we see a blue sky on a sunny day, what are we seeing? Are we seeing blue nitrogen or blue oxygen? The simple answer is no. Instead the blue light we see is scattered sunlight. The Sun ...

Why is the sky blue? It's a common question asked by children, and the simple answer is that blue light is scattered by our atmosphere more than red light, hence the blue sky. That's basically tru ...