This image of the coma of comet 67P/Churyumov-Gerasimenko, seen with ESA'S OSIRIS onboard the Rosetta spacecraft, shows the hazy circular structure to the right and center of the coma is an artifact due to overexposure of the nucleus.
NASA's Opportunity rover, working on Mars since January 2004, passed 25 miles of total driving on the July 27, 2014. The gold line on this map shows Opportunity's route from the landing site inside Eagle Crater, in upper left.
Seen by NASA's Cassini spacecraft, Tethys, like many moons in the solar system, keeps one face pointed towards the planet around which it orbits. Tethys' anti-Saturn face is seen here, fully illuminated, basking in sunlight.
Images of comet 67P/Churyumov-Gerasimenko taken on July 14, 2014, by the OSIRIS imaging system aboard ESA's Rosetta spacecraft have allowed scientists to create this three-dimensional shape model of the nucleus.
Using data from NASA's Kepler and Spitzer Space Telescopes, scientists have made the most precise measurement ever of the size of a world outside our solar system, as illustrated in this artist's conception.
This observation from ESA's Rosetta spacecraft shows that comet 67P/Churyumov-Gerasimenko has a two-part shape. The image on the left is from OSIRIS; the image on the right is enhanced with interpolated data.
As seen by NASA's Cassini spacecraft, the surface of Dione is covered in craters, reminding us of the impacts that have shaped all of the worlds of our solar system; the surface also bears linear features that suggest geological activity in the past.
This frame from an animation shows five versions of observations that NASA's Curiosity made about one hour apart while Mercury was passing in front of the sun on June 3, 2014. Two sunspots, each about the diameter of Earth, also appear.
Possible 'Moonwich' of Ice and Oceans on Ganymede (Artist's Concept)
This artist's concept of Jupiter's moon Ganymede, the largest moon in the solar system, illustrates the 'club sandwich' model of its interior oceans. Scientists suspect Ganymede has a massive ocean under an icy crust.
Moon or Planet? The 'Exomoon Hunt' Continues (Artist's Concept)
Researchers have detected the first 'exomoon' candidate -- a moon orbiting a planet that lies outside our solar system. Using a technique called 'microlensing,' they observed what could be either a moon and a planet -- or a planet and a star.