RTG fit and test

Smooth terrain around the western rim of Ikapati Crater on Ceres is visible in this image from NASA's Dawn spacecraft. The area contains material ejected from Ikapati during its formation.

A broad and ghostly spoke drifts past under the Cassini spacecraft's gaze. The spoke-forming region of the B ring displays faint longitudinal variations in brightness, from left to right, a feature...

This image from the Cassini spacecraft shows a ghostly white streak, called a spoke, in Saturn's B ring. This is the first sighting of a spoke in nearly a year, and the first spoke seen by Cassini ...

Saturn's shepherd moon Prometheus hovers between the A and F rings as if suspended on an invisible thread, while bright clouds drift in Saturn's atmosphere approximately 130,000 kilometers (81,000 ...

This true color mosaic of Jupiter was constructed from images taken by the narrow angle camera onboard NASA's Cassini spacecraft on December 29, 2000, during its closest approach to the giant plane...

This NASA Hubble Space Telescope image of the ringed planet Saturn shows a rare storm that appears as a white arrowhead-shaped feature near the planet's equator. The storm is generated by an upwe...

NASA's Cassini spacecraft captures a composite near-true-color view of the huge storm churning through the atmosphere in Saturn's northern hemisphere.

This image of Helene (N00152211.jpg) was taken by the Cassini spacecraft on March 03, 2010 during its quasi-targeted flyby of Helene. It was received on Earth March 03, 2010. The camera was point...

This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2012. For more information on raw images check out our Freque...

This image of asteroid Vesta from NASA's Dawn spacecraft shows many curved ridges that are typical of Vesta's southern hemisphere. This image is located in Vesta's Sextilia quadrangle, in Vesta's s...

This image shows the surprise that startled Cassini scientists on the composite infrared spectrometer team when they got their first look at the infrared (heat) radiation from the south pole of Sat...

This wide and sweeping view of the sunlit rings of Saturn takes in the impressive variety in their structure -- from the clumpy and perennially intriguing F ring to the many waves, ringlets and gap...

This 2013 animation shows multiple-planet systems discovered by Kepler. 

This image from NASA's Dawn spacecraft shows heavily cratered terrain in asteroid Vesta's equatorial region. The craters have a wide range of sizes and many different forms, which include fresh, de...

Moons and Gaps October 19, 2004 Full-Res: PIA06501 This image captures several important targets of the Cassini mission: icy moons, ri...

This image shows the first flash of sunlight reflected off a hydrocarbon lake on Saturn's moon Titan.

The image was taken in visible light with the Cassini spacecraft narrow angle camera on July 3, 2004, from a distance of 1.6 million kilometers (990,000 miles) from Enceladus and at a Sun-Enceladus...

A movie sequence of Saturn's G ring over a full orbital revolution captures its single bright arc on the ring's inner edge.

The surface of Ceres is covered with craters of many shapes and sizes, as seen in this new mosaic of the dwarf planet comprised of images taken by NASA's Dawn mission on Feb. 19, 2015 from a distan...

Iapetus is a moon of extreme contrasts. The light and dark features give the moon a distinctive "yin and yang" appearance.

The bright whorls and small-scale specks of convective clouds drift through a region just north of Saturn's bright equatorial band. Observers have seen major storms develop in this region in the pa...

This true color image of Jupiter, taken by NASA's Cassini spacecraft, is composed of three images taken in the blue, green and red regions of the spectrum. All images were taken from a distance of ...

This image taken by NASA's Dawn spacecraft presents two small craters on Ceres, located in the vicinity of Toharu Crater. Juling appears at the top and Kupalo at bottom. Both craters are relatively...

+ QuickTime (no audio, 4.7 MB) The Cassini spacecraft's narrow-angle camera captured Saturn's moon Rhea as it gradually slipped into the planet's shadow – an event known as “ingress” – on Aug. 19,...

The crescent Earth rises above the lunar horizon in this spectacular photograph taken from the Apollo 17 spacecraft in lunar orbit during final lunar landing mission in the Apollo program.