Last week's Thursday Challenge: Sky (Unsubmitted)

The sky is mixture of gases and other materials that surround the Earth in a thin, mostly transparent shell. It is held in place by the Earth's gravity. The main components are nitrogen (78.09%), oxygen (20.95%), argon (0.93%), and carbon dioxide (0.03%). The atmosphere also contains small amounts, or traces, of water (in local concentrations ranging from 0% to 4%), solid particles, neon, helium, methane, krypton, hydrogen, xenon and ozone.

It's a little blurry because my camera had a hard time getting the autofocus right and the sky wouldn't stop MOVING!