Jean-Pierre Lebreton

Various observations of Pluto over the course of several decades.

This image from NASA's Dawn spacecraft is dominated by Caparronia impact crater, approximately 55 km in diameter with a mostly fresh, irregularly shaped rim. It also has a curved, linear mound runn...

The Cassini spacecraft snapped this high-resolution image of Saturn's small moon Epimetheus during the spacecraft's non-targeted flyby on April 7, 2010. The view was obtained at a distance of appr...

These five images of single stars, taken at different times with the narrow-angle camera on NASA's Cassini spacecraft, show the effects of haze collecting on the camera's optics, then successful re...

The Cassini spacecraft successfully completed its only flyby of Saturn's moon Dione on Oct. 11. In the process, Cassini captured Dione eclipsing Saturn's moon Rhea. In the picture above, the dist...

This false color image of two density waves in Saturn's A ring was made from the stellar occultation observed by Cassini's ultraviolet imaging spectrograph when the spacecraft was 6.3 million kilom...

Summer is slowly coming to Saturn's northern hemisphere.

This color-coded map from NASA's Dawn mission shows the highs and lows of topography on the surface of dwarf planet Ceres. It is labeled with names of features approved by the International Astrono...

NASA's Dawn mission has found that craters on Ceres show a diversity of shapes that provide important clues about the structure of Ceres' subsurface; shown here is Fejokoo, a polygonal crater.

This global map of Saturn's moon Tethys was created using images taken during Cassini spacecraft flybys, with Voyager images filling in the gaps in Cassini's coverage. The map is an equidistant (s...

NASA's Dawn spacecraft after installation of high gain antenna.

This Cassini spacecraft image holds an unseen treasure orbiting within the bright arc of Saturn's G ring: the tiny moonlet Aegaeon. The moonlet itself is too small to be seen within the arc pictur...

+ View Image without Labels The Cassini spacecraft captures eight new propeller-like features within Saturn's A ring in what may be the propeller "hot zone" of Saturn's rings. Propeller features ...

The Cassini spacecraft surveys the battered surface of icy Tethys. The great impact basin straddling the terminator is itself overprinted by many smaller impact sites. The view in this image is to...

The moons Dione and Tethys face each other across the gulf of Saturn's rings. Here, the Cassini spacecraft looks on the Saturn-facing hemisphere of Tethys below and the anti-Saturn side of Dione ab...

From just below the plane of Saturn's rings, the Cassini spacecraft looks at the rings edge-on and sees the planet's second largest moon beyond. Although Rhea may appear to be in the foreground of...

These two images of Saturn show the entire south polar region, not just the little area around the core of the hurricane-like vortex.

These two global images of Iapetus show the extreme brightness dichotomy on the surface of this peculiar Saturnian moon.

One of the most exciting features of Tethys (and of the whole Saturnian system as well) is Ithaca Chasma, a huge trench which extends from near the north pole down almost all the way to the south ...

Having passed closer to Tethys than the Voyager 2 spacecraft, Cassini has returned the best-ever natural color view of this icy Saturnian moon. As seen here, the battered surface of Tethys (1,060 ...

The Cassini spacecraft looks across the surface of Saturn's moon Dione and details the "wispy" terrain first chronicled by Voyager.

From its unique perspective high above the planet, the Cassini spacecraft looks down upon Saturn's murky northern hemisphere. The bluish hues seen in some Cassini views of Saturn's north are notabl...

This Voyager 2 image of the Uranian rings delta, gamma, eta, beta and alpha (from top) was taken Jan. 23, 1986. 

The Cassini spacecraft gazes toward a distant star as Saturn's rings slip past in the foreground. At upper left is the outer A ring, with its dark Keeler Gap. At lower right, a train of bright clum...

Saturn's moon Dione, in the foreground of this Cassini spacecraft image, appears darker than the moon Tethys. Tethys appears brighter because it has a higher albedo than Dione, meaning Tethys refl...