NASA's Voyager 2 acquired this black and white image of Triton, Neptune's largest satellite, during the night of Aug. 24-25, 1989. Triton's limb cuts obliquely across the middle of the image. The field of view is about 1,000 km (600 miles) across.
This false-color view taken by NASA's Cassini spacecraft is one of a panel of three images of Saturn's moon Iapetus showing the boundary of the global 'color dichotomy' on the hemisphere of this moon facing away from Saturn.
NASA's Cassini spacecraft examines the rough dark-light dichotomy of the terrain on Saturn's moon Iapetus. Lit terrain seen here is on the Saturn-facing side of Iapetus.
On Jan. 24, 1986, NASA's Voyager 2 returned the highest-resolution picture of Titania, Uranus' largest satellite. Abundant impact craters of many sizes pockmark the ancient surface; most prominent features are fault valleys that stretch across Titania.
Rhea's trailing hemisphere shows off its wispy terrain on the left of this image taken by NASA's Cassini spacecraft which includes Saturn's rings in the distance.
The moon Tethys is upstaged by two smaller moons, Pandora and Prometheus, in this image from NASA's Cassini spacecraft. Go to the Photojournal to view the animation.
The bright arc within Saturn's G ring is shown truncated by the shadow of the planet at the bottom of this image captured by NASA's Cassini spacecraft.
The Cassini spacecraft looks toward Rhea's cratered, icy landscape with the dark line of Saturn's ringplane and the planet's murky atmosphere as a background. Rhea is Saturn's second-largest moon, at 1,528 kilometers (949 miles) across.
Saturn's most prominent feature, its dazzling ring system, takes center stage in this stunning natural color mosaic which reveals the color and diversity present in this wonder of the solar system.
These images taken by NASA's Voyager 2 show changes in the clouds around Neptune's Great Dark Spot (GDS) over a four and one-half-day period. From top to bottom the images show successive rotations of the planet an interval of about 18 hours.
Saturn's shadow interrupts the planet's rings, leaving just thin slivers of the rings visible in this image, which shows a pair of the planet's small moons. Helene is in the center top of the image, Epimetheus is in the lower right.
Orbiting near the plane of Saturn's rings, NASA's Cassini spacecraft looks across the span of the rings to spy the small moon Epimetheus. The brightest spoke is visible on the left of the image.
This image, which at first appears to show a serene scene, in fact
reveals dramatic disturbances created in Saturn's A ring by its moon
Daphnis as seen by NASA's Cassini spacecraft.
NASA's Cassini spacecraft captured Saturn's moon Prometheus, orbiting near the streamer-channels it has created in the thin F ring, casts a shadow on the A ring in this image taken a little more than a week after the planet'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.
These two images, taken four years before Saturns August 2009 equinox by NASA's Cassini spacecraft, indicate the streaks in these images are likely evidence of impacts into the planets rings.
Alternating light and dark bands, extending a great distance across Saturns D and C rings taken by NASA's Cassini spacecraft one month before the planets August 2009 equinox.