The fantastic website Astronomy Picture of the Day features a new astronomy-related picture every single day of the year, with short, informative descriptions written by astronomers.
I love these pictures. From the awe-inspiring galaxy-scapes of the Hubble Deep Field camera to remarkable images taken much closer to home like this picture of Saturn, every day APOD highlights something wondrous and beautiful in the universe. The pictures often make me feel very small, and raise in my mind profound questions that have no answer. And on top of that, they are just very pretty to look at.
This picture is a view of the dark side of Saturn (the sun is eclipsed) taken by the Cassini solar system probe. Saturn's breathtaking rings are thrown into sharp relief. If you click on the image you can visit the APOD site and read the description there; you will also see a larger version of the picture in which our own planet is visible as a tiny dot of light in the background.