This enhanced-color image of the northern hemisphere of Saturn taken by Voyager 1 on November 5, 1980 at a range of 5.5 million miles shows a variety of features in Saturn's clouds. Time-lapse images of cloud features like those shown in this image not only provide information on how these storms evolve with time, but provide a way to measure atmospheric wind speeds. NASA
Color contrast of the mosaic view of Saturn presented here is greatly exaggerated. In such views, imaging scientists have noticed color variations across the diffuse rings that imply active processes which sort the particles in the ring according to their sizes. Looking at the E ring in this color-exaggerated view, the distribution of color across and along the ring appears to be different between the right side and the left. Scientists are not sure yet how to explain these differences. NASA/JPL/Space Science Institute
Waves of clouds along the east flanks of the Andes Mountains cast off an orange glow from the low angle of the sun in the west. The dark area to the left is the earth's terminator. This view was photographed by Astronaut Frank Borman and James A. Lovell during the Gemini 7 mission in 1965. NASA
This artist's concept depicts the New Horizons spacecraft during a planned encounter with Pluto and its moon, Charon. The craft's miniature cameras, radio science experiment, ultraviolet and infrared spectrometers and space plasma experiments would characterize the global geology and geomorphology of Pluto and Charon, map their surface compositions and temperatures, and examine Pluto's atmosphere in detail. Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/JHUAPL/SwRI
This artist rendering shows a proposed ice-penetrating cryobot and a submersible hydrobot that could be used to explore the ice-covered ocean on Jupiter's large satellite, Europa. Scientists propose first testing these instrument-ladened robots by sending them to Lake Vostok, a subglacial lake in Antarctica. The cryobot would melt its way through the ice cover and then deploy a hydrobot, a self-propelled underwater vehicle that would analyze the chemical composition of the ice and water in a search for signs of life. NASA/JPL-Caltech
The Aero Spacelines B-377PG Pregnant Guppy was flown to Dryden for tests and evaluation by pilots Joe Vensel and Stan Butchart in October 1962. The outsized cargo aircraft incorporated the wings, engines, lower fuselage and tail from a Boeing 377 Stratocruiser with a huge upper fuselage more than 20 feet in diameter. The modified aircraft was built to transport outsized cargo for NASA's Apollo program, primarily to carry portions of the Saturn 5 rockets from the manufacturer to Cape Canaveral. NASA
This eight-image mosaic was acquired during the late afternoon as part of the predeploy "insurance panorama" and shows the newly deployed rover sitting on the Martian surface in 1996. The insurance panorama was designed as "insurance" against camera failure upon deployment. Had the camera failed, the losslessly-compresse d, multispectral insurance panorama would have been the main source of image data from the IMP. NASA
NASA's Stardust spacecraft made a close flyby of comet Wild 2 (pronounced "Vilt-2"). Among the equipment the spacecraft carried on board was a navigation camera. Comet Wild 2 is about 3.1 miles in diameter. This artist's concept depicts a view of Wild 2 that shows the faint jets emanating from the comet. NASA/JPL-Caltech
The Apollo 8 prime crew is seen inside Apollo Boilerplate 1102A during water egress training in the Gulf of Mexico in 1968. Left to right, are William A. Anders, lunar module pilot; James A. Lovell Jr., command module pilot; and Frank Borman, NASA
This poster shows a flattened projection of the Huygens probe's view from 6 miles above Saturn's moon Titan. The images that make up this view were taken on Jan. 14, 2005, with the descent imager/spectral radiometer onboard the European Agency's Huygens probe. The Huygens probe was delivered to Saturn's moon Titan by the Cassini spacecraft, which is managed by NASA's Jet Propulsion Laboratory in Pasadena, Calif. ESA/NASA/JPL/University of Arizona
Egypt's President Abdel-Fattah el-Sissi called it a 'terrorist attack' on soldiers defending the country's borders that will 'not go unanswered.'
BySarah El Deeb, Associated Press
Al Youm Al Saabi Newspaper/Reuters
Gunmen armed with rocket-propelled grenades attacked a border guard post Saturday in Egypt's western desert in a brazen assault that killed 21 troops deployed in the province along the border with neighboring Libya.