* Scattering: The blue color of our sky is caused by a phenomenon called Rayleigh scattering. Sunlight is composed of all colors of the rainbow, but blue light gets scattered more than other colors by the tiny molecules of gas in our atmosphere. This scattered blue light is what we see as the blue sky.
* No scattering, no color: Without an atmosphere, there's nothing to scatter the sunlight. We would see the sun as a bright white disk in a black sky.
* Stars visible during the day: We would also be able to see stars during the day, as there would be no atmospheric haze to obscure them.
So, the next time you look up at the blue sky, remember that it's the air around us that makes it blue!
