Photos: Saturn's greatest hits

NASA is asking people to choose the best photograph taken by the Cassini spacecraft as it approaches its second anniversary at the planet Saturn.

NASA lets viewers vote for the best of the 15 photos listed. However, one of our favorites (photo 16) wasn't even nominated. The winner will be announced in February.

In this image, the bluish dot between Saturn's rings is Earth (also inset).

Photo by NASA/JPL/Space Science Institute