Artist's concept

This image from NASA's Dawn spacecraft of asteroid Vesta shows the characteristic undulating surface of Vesta's southern hemisphere and many small craters, some of which make up secondary crater ch...

The moon Enceladus passes behind the larger moon Tethys, as seen in this pair of Cassini spacecraft images. The image on the left was taken a little more than a minute before the image on the righ...

NASA's Dawn spacecraft captured this scene, showing southern mid-latitudes on Ceres, on Oct. 18, 2015, from an altitude of 915 miles (1,470 kilometers). It has a resolution of 450 feet (140 meters)...

The rim of Hamori Crater on Ceres is seen in the upper right portion of this image, which was taken by NASA's Dawn spacecraft. Hamori is located in the southern hemisphere of Ceres and measures 37 ...

Saturn's moons Prometheus and Pandora are captured here in a single image taken from less than a degree above the dark side of Saturn's rings. Pandora is on the right, and Prometheus is on the lef...

Rhea brushes the stormy face of Saturn, an airless ice orb against the feathery bands of a gas giant. Saturn's unilluminated rings are seen at upper right. Rhea is the second largest of Saturn's m...

This Cassini spacecraft view of Titan shows banding in the atmosphere of the moon's northern hemisphere. Like the planet Venus, Titan's atmosphere rotates faster than its surface, a characteristic...

The Cassini spacecraft peers through the hazy atmosphere of Titan for a close view of light and dark terrain on Saturn's largest moon. This view is centered on terrain at 28 degrees south latitude...

Few large craters are to be found in the wrinkled terrain of Enceladus, where the surface has been reworked by geologic processes presumably resulting from the moon's inner warmth. Cassini spied t...

This enhanced-color image was created by combining three images taken through ultraviolet, violet and green filters on July 12, 1981. Several changes were apparent in Saturn's atmosphere since Voya...

Clouds and vortices churn in this beautiful, close-up view of Saturn. This image is part of a series of important Cassini observations designed to provide information about winds and convection on ...

This artist's impression of Saturn's moon Titan shows the change in observed atmospheric effects before, during and after equinox in 2009. The Titan globes also provide an impression of the detache...

                  Haze Silhouettes Against Titan's Glow December 16, 2004   Full-Res: PIA06997   A high-altitude haze laye...

Gazing Upon Mimas September 9, 2004 Full-Res: PIA06473 On its first orbit of the ringed planet, the Cassini spacecraft gazed into ...

This mosaic of image swaths from Cassini's Titan Radar Mapper, taken with the synthetic-aperture radar (SAR), features a large dark region several hundred kilometers across that differs in several ...

Receding Rhea August 10, 2004 Full-Res: PIA05431 This view of Saturn's icy moon Rhea shows hints of its heavily cratered surface, ...

The bright, perturbed core of Saturn's F ring displays several kink-like features. The core is flanked by dimmer, smoother ringlets. This view looks toward the unilluminated side of the rings from...

+ Also see Titan's Lingering Clouds -- Annotated Lots of clouds are visible in this infrared image of Saturn's moon Titan. These clouds form and move much like those on Earth, but in a much slower...

This image from NASA's Dawn spacecraft shows the edge of Ezinu Crater on Ceres. Dawn took this image on June 10, 2016, from its low-altitude mapping orbit, at a distance of about 240 miles (385 kil...

The Cassini spacecraft monitors Titan's developing south polar vortex, which is a mass of swirling gas around the pole in the atmosphere of the moon. The vortex can be seen at the bottom of this v...

The Cassini spacecraft spots a couple of large, wedge-shaped spokes in Saturn's B ring. These spokes are similar in appearance to those seen by the Voyager spacecraft (see Saturn's rings - high r...

NASA, the National Science Foundation (NSF) and the Smithsonian Institution (SI) recently renewed their agreement to search for, collect and curate Antarctic meteorites in a partnership known as AN...

This image mosaic of Eros' southern hemisphere, taken by NEAR Shoemaker on November 30, 2000, offers a long-distance look at the cratered terrain south of where the spacecraft will touch down on Fe...

During its historic close encounter with Phoebe, the Cassini spacecraft captured a series of high resolution images of the small moon, six of which have been put together to create this mosaic.

This Cassini image shows predominantly the impact-scarred leading hemisphere of Saturn's icy moon Rhea (1,528 kilometers, or 949 miles across). The image was taken in visible light with the Cassin...