RTG fit and test

This perspective, from just beneath Saturn's ringplane, gives the rings a pointed appearance and captures a few clumps at the edge of the narrow F ring. Tethys (1,071 kilometers, 665 miles across) ...

The cone-shaped central peak of a Cerean crater casts a long shadow in this view from NASA's Dawn spacecraft taken on May 28, 2016 from its low-altitude mapping orbit above Ceres at a distance of a...

NASA's Cassini spacecraft has spotted a glowing patch of ultraviolet light near Saturn's north pole that marks the presence of an electrical circuit that connects Saturn with its moon Enceladus. 

This image of asteroid Vesta from NASA's Dawn spacecraft shows a large crater with an irregularly shaped, reasonable sharp, fresh rim.

This view from NASA’s Dawn mission shows the floor of Ceres’ Juling Crater. The crater floor shows evidence of the flow of ice and rock, similar to rock glaciers in Earth’s polar regions.

This image of Ceres' limb was obtained by NASA's Dawn spacecraft on May 30, 2018 from an altitude of about 280 miles (450 kilometers).

A bright narrow ring dominates this view of the Cassini Division separating Saturn's A and B rings. The brightest ringlet in this image has been spotted by Cassini before, and is known to be eccen...

Technicians Susan Ung and Andy Anderson cut and stitch the gold-colored thermal blankets for NASA's Cassini spacecraft.

This area imaged by the Cassini radar system during the spacecraft's third close flyby of Titan on Feb. 15, 2005, is just to the east of the Circus Maximus impact feature (see http://photojournal.j...

This picture of Ganymede, Jupiter's largest satellite, was taken by Voyager 1 on March 5, 1979.

Cassini radar sees sand dunes on Saturn's giant moon Titan (upper photo) that are sculpted like Namibian sand dunes on Earth (lower photo). The bright features in the upper radar photo are not clou...

Evoking the haunting beauty of Earth's Moon, a crescent Enceladus appears in the skies around Saturn. Lit terrain seen here is on the Saturn-facing hemisphere of Enceladus. North on Enceladus is u...

This image was taken on March 10, 2013, and received on Earth March 10, 2013 by NASA's Cassini spacecraft. The camera was pointing toward Rhea at approximately 174,181 miles (280,317 kilometers) aw...

NASA's Dawn spacecraft took this image of Ceres' south polar region on May 17, 2017. Ceres appears as a crescent as Dawn is on the night side of the dwarf planet.

Cassini gazed toward high southern latitudes near Saturn's south pole to observe ghostly curtains of dancing light -- Saturn's southern auroras, or southern lights. 

This narrow angle image taken by Cassini's camera system of Earth's moon is one of the best of a sequence of narrow angle frames taken as the spacecraft passed by the Moon on the way to its closest...

Saturn appears to Cassini's cameras as a thin, sunlit crescent in this unearthly view.

The low angle of sunlight along the slim crescent of Saturn's moon Enceladus (313 miles or 504 kilometers across) highlights the many fractures and furrows on its icy surface.

This image, taken by NASA's Dawn spacecraft, shows dwarf planet Ceres from an altitude of 2,700 miles (4,400 kilometers). The image, with a resolution of 1,400 feet (410 meters) per pixel, was take...

This image, taken by NASA's Dawn spacecraft, shows the surface of dwarf planet Ceres from an altitude of 915 miles (1,470 kilometers). The image, with a resolution of 450 feet (140 meters) per pixe...

Opportunity turned its rover eyes skyward to observe clouds drifting overhead that look like cirrus clouds on Earth – featherlike formations composed mostly of ice crystals. 

This anaglyph image from NASA's Dawn spacecraft shows the topography of the mountain-central complex in asteroid Vesta's south polar region. You need 3-D glasses to view this image.

Beside the swirling face of Saturn floats a small, icy attendant. Mimas (397 kilometers, or 247 miles across) hovers near its giant parent, beyond the gleaming, sunlit rings. This view looks towa...

Saturn's moon Atlas, shown at the center of this image, orbits within the Roche Division separating the A ring from the tenuous F ring. To learn more about the small moon Atlas (30 kilometers, 19 ...

Cassini looks toward northern latitudes on Saturn and out across the ringplane. This infrared view probes clouds beneath the hazes that obscure the planet's depths in natural color views. This ima...