Star Clouds over Arizona
The clouds in the foreground are much different than the clouds in the background.
In the foreground are a photogenic deck of Earth-based water clouds. The long exposure
used to create the above photograph makes the light from the left, reflected from
Phoenix, Arizona, USA, appear like a sunset. Far in the distance, however, are star
clouds from the disk of our Milky Way Galaxy. Billions of stars like our Sun live
there, circling our Galactic center every 200 million years. Contrast between the water
clouds and the star clouds has been digitally enhanced. Between the two, visible on
the upper right, is the planet Jupiter.