Saturn's small moon Daphnis is caught in the act of raising waves on the edges of the Keeler gap, which is the thin dark band in the left half of the image. Waves like these allow scientists to locate small moons in gaps and measure their masses.
The Cassini spacecraft captures here one of its closest views of Saturn's ring-embedded moon Daphnis. Seen at the upper left of this image, Daphnis appears in the Keeler Gap near the edge waves it has created in the A ring.
This image taken by NASA's Cassini spacecraft shows that rather than being an unchanging disk of peaceful particles, the material that makes up Saturn's rings is constantly pushed and pulled into spectacular shapes. At left is the moon Daphnis.
Saturn's moon Daphnis casts a short shadow on the A ring in this image taken by NASA's Cassini spacecraftabout six months after the planet's August 2009 equinox. Daphnis appears as a tiny bright dot in the Keeler Gap of the A ring near the center top.
Tiny Daphnis appears as a bright dot in the Keeler Gap next to shadows cast by the moon and the edge waves it has created in the A ring in this image taken by NASA's Cassini spacecraft before Saturn's August 2009 equinox.
Long shadows stretch away from the towering edge waves created by the gravity of the moon Daphnis in this image taken by NASA's Cassini spacecraft a little more than a week before Saturn's August 2009 equinox.