Small water ice particles fly from fissures in the south polar region of Saturn's moon Enceladus. The moon's famous jets can be faintly seen erupting from the fractures that cross its south polar region. A more dramatic view of the jets can be seen here: http://photojournal.jpl.nasa.gov/catalog/PIA11688
This image from NASA's Cassini spacecraft looks toward the night side of Saturn, which is in the lower left. Enceladus is in the top right. Sunlight scatters through the planet's atmosphere and forms the bright diagonal line running from the left to bottom right of the image.