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	Callisto - http://www.marsjupiter.com/callisto This program presents forums from multiple bulletin boards and USENET news groups in your own user-defined forums. They can be viewed from within this program or with Callisto's Web server. Topics can be tracked, sorted and saved. Keywords: Callisto; Internet; Web browsers and tools; Web browsers; Callisto Downloads: 16
	Concentric Rings Surrounding Valhalla - NASA The concentric rings surrounding Valhalla are perhaps the most distinctive geological feature on Callisto. This Voyager 1 close-up shows a segment of the ridged terrain. The presence of superimpact craters shows that the rings formed early in Callisto's history; however, the density of craters is less here than on other parts of the satellite, where the surface is older. Keywords: What -- Callisto; What -- Voyager 1
	Callisto Mosaic - NASA Callisto was revealed by the Voyager cameras to be a heavily cratered and hence geologically inactive world. This mosaic of Voyager 1 images, obtained on March 6 from a distance of about 400,000 kilometers, shows surface detail as small as 10 kilometers across. The prominent old impact feature Valhalla has a central bright spot about 600 kilometers across, probably representing the original impact basin... Keywords: What -- Callisto; What -- Voyager 1
	Callisto - NASA This black and white image of Callisto was taken by Voyager 2 about 3:20 A.M PDT Saturday, July 7, from a range of about 1.1 million kilometers (675,000 miles). The picture has been enhanced to reveal detail in the scene. Voyager l's high resolution coverage was of the hemisphere just over the right-hand (eastern) horizon, and the large ring structure discovered by Voyager 1 is just over the eastern limb... Keywords: What -- Callisto; What -- Voyager 1
	Callisto Hemispherical Globes - NASA The images used for the base of this globe were chosen from the best image quality and moderate resolution coverage supplied by Galileo SSI and Voyager 1 and 2 (Batson, 1987; Becker and others, 1998; Becker and others, 1999; Becker and others, 2001). The digital map was produced using Integrated Software for Imagers and Spectrometers (ISIS) (Eliason, 1997; Gaddis and others, 1997; Torson and Becker, 1997)... Keywords: What -- Galileo; What -- Voyager 1; What -- Callisto
	Callisto Hemispherical Globes - NASA/Jet Propulsion Laboratory (NASA-JPL) The images used for the base of this globe were chosen from the best image quality and moderate resolution coverage supplied by Galileo SSI and Voyager 1 and 2 (Batson, 1987; Becker and others, 1998; Becker and others, 1999; Becker and others, 2001). The digital map was produced using Integrated Software for Imagers and Spectrometers (ISIS) (Eliason, 1997; Gaddis and others, 1997; Torson and Becker, 1997)... Keywords: What -- Galileo; What -- Voyager 1; What -- Callisto Downloads: 1
	A79-7079 - NASA/Ames Research Center Photographer: JPL P-21745 BW Range: 1.1 million miles (675,000 miles) This image of Callisto taken by Voyager 2 was enhanced to reveal detail in the scene. Voyager 1's high resolution coverage was of the hemisphere just over the right-hand (eastern) horizon, and the large ring structure discovered by Voyager 1 is just over the eastern limb. This image shows yet another ring structure in the upper part of the picture... Keywords: What -- Callisto; What -- Voyager 1; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	Ganymede's Varied Terrain - NASA Voyager 2 took this picture of Ganymede as the spacecraft was nearing its encounter with the ice giant. It was taken from a range of 312,000 kilometers (195,000 miles), and it shows features down to about 5 to 6 kilometers across. Clear examples of several of the different types of terras in common on Ganymede s surface are visible (right).. The boundary of the largest region of dark ancient terrain on Ganymede can be seen to the east (right), revealing some of the light linear features which ma... Keywords: What -- Voyager 1; What -- Ganymede; What -- Callisto; What -- Earth Downloads: 1
	Les catacombes romaines. Cimetière de Saint-Calixte - Nortet 31 Keywords: Cimitero di Callisto (Rome, Italy); Inscriptions -- Rome, Italy Downloads: 104
	Hubble Photo Gallery of Jupiter's Galilean Satellites - Credit: K. Noll (STScI [ http://www.stsci.edu/ ]), J. Spencer (Lowell Observatory), and NASA [ http://www.nasa.gov/ ] Description: This is a Hubble Space Telescope "family portrait" of the four largest moons of Jupiter, first observed by the Italian scientist Galileo Galilei nearly four centuries ago. Located approximately one-half billion miles away, the moons are so small that, in visible light, they appear as fuzzy disks in the largest ground-based telescopes. Hubble can resolve surface details seen previously only by the Voyager spacecraft in the early 1980s... Keywords: Jupiter; Io; Europa; Ganymede; Callisto; What -- Hubble Space Telescope (HST); What -- Jupiter; What -- Galileo; What -- Visible Light; What -- Voyager; What -- Moon; What -- Europa; What -- Ganymede; What -- Callisto
	Jupiter's Moon Callisto Voyager 1 image of Jupiter's moon Callisto from a distance of 350,000 km. Callisto is about 4,800 km in diameter (about the size of Mercury). Features as small as 7 km across can be seen in this image. The large "bulls-eye" at the top of the image is believed to be an impact basin formed early in Callisto's history. The bright center of the basin is about 600 km across and the outer ring is about 2600 km across... Keywords: Solar System Exploration; Jet Propulsion Laboratory; Planets; What -- Voyager 1; What -- Moon; What -- Callisto; What -- Mercury
	Europa During Voyager 2 Closest Approach - NASA This color image of the Jovian moon Europa was acquired by Voyager 2 during its close encounter on Monday morning, July 9. Europa, the size of our moon, is thought to have a crust of ice perhaps 100 kilometers thick which overlies the silicate crust. The complex array of streaks indicate that the crust has been fractured and filled by materials from the interior. The lack of relief, any visible mountains or craters, on its bright limb is consistent with a thick ice crust... Keywords: What -- Moon; What -- Europa; What -- Voyager 2; What -- Ganymede; What -- Callisto; What -- Io
	Craters near the south pole of Callisto - NASA This image of the south polar region of the Jovian satellite Callisto was taken in twilight by the Galileo spacecraft on its eighth orbit around Jupiter. Craters ranging in size from 60 kilometers (36 miles) down to the limit of resolution are visible in this image. Scientists count the number of craters on a planetary surface to estimate its relative (and sometimes absolute) age. Note that many of the craters are not as sharp in appearance as the two large craters near the bottom of the image... Keywords: What -- Polar; What -- Callisto; What -- Galileo; What -- Jupiter; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington
	Europa's Evening Terminator - NASA This image of the Jovian moon Europa was taken by Voyager 2 the spacecraft passed within 225,000 kilometers. The area shown is about 600 by 800 kilometers, July 9, 1979, as (140,625 miles). and the smallest features visible are about 4 kllometers in size. This image was taken along the evening terminator, which best shows the surface topography of complex narrow ridges, seen as curved bright streaks, 5 to 10 kilometers wide, andAlso visible are dark bands, typically 100 kilometers in length... Keywords: What -- Moon; What -- Europa; What -- Voyager 2; What -- Io; What -- Callisto; What -- Ganymede
	Europa Linear Features from 246,000 kilometers - NASA The first close look ever obtained of Jupiter's satellite, Europa, was taken today, July 9, by Voyager 2 as the spacecraft approached the planet. The linear crack-like features had been seen from a much greater distance last March by Voyager 1. This picture was made at a range of 246,000 kilometers (152,000 miles) and provides a resolution of about four kilometers (2.5 miles). The complicated linear features appear even more like cracks or huge fractures in these images... Keywords: What -- Europa; What -- Voyager 1; What -- Ganymede; What -- Callisto; What -- Io
	Callisto Close-up with Jagged Hills - NASA/JPL/Arizona State University, Academic Research Lab [ http://academic-research.com ] The highest-resolution views ever obtained of any of Jupiter's moons, taken by NASA's Galileo spacecraft in May 2001, reveal numerous bright, sharp knobs covering a portion of Jupiter's moon Callisto. The knobby terrain seen throughout the top inset is unlike any seen before on Jupiter's moons. The spires are very icy but also contain some darker dust. As the ice erodes, the dark material apparently slides down and collects in low-lying areas... Keywords: What -- Galileo; What -- Moon; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL); Where -- California; Where -- Washington
	The Asgard Hemisphere of Callisto - NASA False color view of a portion of the leading hemisphere of Jupiter's moon Callisto as seen through the infrared filters of the Solid State Imaging (CCD) system aboard NASA's Galileo spacecraft. North is to the top of the picture and the sun illuminates the surface from the east. More recent impacts have excavated bright, relatively clean ice from beneath Callisto's battered surface. Callisto's dark mottled appearance may be due to contamination by non-ice components contributed by impactors or c... Keywords: What -- Moon; What -- Callisto; What -- Galileo; What -- Sun; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington
	Interior of Callisto - NASA Cutaway view of the possible internal structure of Callisto. The surface of the satellite is a mosaic of images obtained in 1979 by NASA's Voyager spacecraft. The interior characteristics are inferred from gravity field and magnetic field measurements by NASA's Galileo spacecraft. Callisto's radius is 2403 km, larger than our Moon's radius. Callisto's interior is shown as a relatively uniform mixture of comparable amounts of ice and rock... Keywords: What -- Callisto; What -- Voyager; What -- Galileo; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington
	A79-7017 - NASA/Ames Research Center Photographer : JPL Range : 7 million kilometers (5 million miles) Callisto is the outermost Galilean satellite of Jupiter and the darkest of the four, but still twice as bright as Earth's Moon. Mottled appearance from bright and dark patches; bright ones look like rayed or brite craters on our Moon. This face of Callisto is always turned toward Jupiter. Photo taken through violet filter. Keywords: What -- Callisto; What -- Jupiter; What -- Moon; Where -- Jet Propulsion Laboratory (JPL) Downloads: 2
	A79-7020 - NASA/Ames Research Center Photographer : JPL Range : 7 million kilometers (5 million miles) Callisto is Jupiter's outermost Galilean satellites and darkest of the four(but almost twice as bright as Earth's Moon). Mottled appearance from bright and dark patches. Bright spots seem like rayed or bright halved craters seen on our Moon. This face is always turned toward Jupiter. Photo taken through violet filter. Ganymede is slightly larger than Mercury but much less dense (twice the density of water)... Keywords: What -- Callisto; What -- Moon; What -- Jupiter; What -- Ganymede; What -- Mercury; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	A79-7027 - NASA/Ames Research Center Photographer: JPL This photo of Callisto, outermost of Jupiter's four Galilean satellites, was taken a few minutes after midnight (PST) Feb. 25 by Voyager 1. The distance to Callisto was 8,023,000 kilometers (4.98 million miles). The hemisphere in this picture shows a fairly uniform surface dotted with brighter spots that are up to several hundred kilometers across. Scientists believe the spots may be impact craters but higher-resolution photos will be necessary before the features can be interp... Keywords: What -- Voyager 1; What -- Callisto; What -- Mercury; What -- Moon; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	A79-7075 - NASA/Ames Research Center Photographer: JPL P-21740 BW Range: 2,318,000 kilometers (1,438,000 miles) This picture of Callisto taken by Voyager 2 shows the moon covered with bright spots which are metoerite impact craters--a fact originally discovered from the high resolution pictures taken by Voyager 1. Scientists believe that heavily cratered terrains like these on Callisto are indicative of ancient planetary surfaces. Voyager 2 mapped the side of Callisto not seen by Voyager 1... Keywords: What -- Callisto; What -- Voyager 1; What -- Moon; Where -- Jet Propulsion Laboratory (JPL) Downloads: 4
	A79-7080 - NASA/Ames Research Center Photographer: JPL P-21746 BW Range: 390,000 kilometers (245,000 miles) This photomosaic of Callisto is composed of nine frames. The impact crater distribution is very uniform across the disk. Notable are the very bright rayed craters that probably are very young. Near the limb is a giant probable impact structure. Several large structures were discovered by Voyager 1. This one is smaller than the largest one found by Voyager 1 but is more clearly shown... Keywords: What -- Callisto; What -- Crater; What -- Voyager 1; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	A79-7093 - NASA/Ames Research Center Photographer : JPL Range : 225,000 kilometers (140,625 miles) This image of the Jovian moon Europa was taken by Voyager 2 along the evening terminator, which best shows the surface topography of complex narrow ridges, seen as curved bright streaks, 5 to 10 kilometers wide, and typically 100 kilometers in length. The area shown is about 600 by 800 kilometers, and the smallest features visible are about 4 kilometers in size... Keywords: What -- Moon; What -- Europa; What -- Voyager 2; What -- Io; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	A79-7107 - NASA/Ames Research Center Photographer : JPL Range : top- 86,000 miles bottom- 192,000 mi. These two close-ups of Ganymede, the largest of Jupiter's 13 moons, show different views of the largest block of dark, heavily cratered terrain. The bottom image shows objects 3 or 4 miles across, with resolution of about 1.5 miles. The light, linear stripes recurring across the dark region resemble the outer rings of the large ring structure around Callisto... Keywords: What -- Callisto; What -- TRACE; What -- Ganymede; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	AC79-7002 - NASA/Ames Research Center Photographer : JPL Callisto , The outermost Galilean Satellite , or Moon , of Jupiter, as taken by Voyager I . Range : About 7 Million km (5 Million miles) . Callisto, the darkest of the Galilean Satellites, still nearly twice as bright as the Earth's Moon, is seen here from the face that always faces Jupiter. All of the Galilean Satellites always show the same face to Jupiter, as the Earth's moon does to Earth... Keywords: What -- Callisto; What -- Moon; What -- Voyager; What -- Jupiter; What -- Earth; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	AC79-7075 - NASA/Ames Research Center Photographer: JPL P-21740 C Range: 2,318,000 kilometers (1,438,000 miles) This picture of Callisto taken by Voyager 2 shows the moon covered with bright spots which are metoerite impact craters--a fact originally discovered from the high resolution pictures taken by Voyager 1. Scientists believe that heavily cratered terrains like these on Callisto are indicative of ancient planetary surfaces. Voyager 2 mapped the side of Callisto not seen by Voyager 1... Keywords: What -- Callisto; What -- Voyager 1; What -- Moon; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	AC79-7078 - NASA/Ames Research Center Photographer: JPL P-21744 C Range: 4.2 million kilometers (2.6 million miles) In this image of Europa acquired by Voyager 2, global scale dark streaks are becoming visible. Europa, the size of the earth's moon, is apparently covered by water ice as indicated by ground based spectrometers and its brightness. The central longitude of this view is 235 _ west. Bright rayed impact craters which are abundant on ancient Ganymede and Callisto would easily be visible at this range... Keywords: What -- Europa; What -- Voyager 2; What -- Ganymede; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	AC79-7095 - NASA/Ames Research Center Photographer : JPL Range : 312, 000 kilometers (195,000 miles) This photo of Ganymede (Ice Giant) was taken from Voyager 2 and shows features down to about 5 to 6 kilometers across. Different types of terrain common on Ganymede's surface are visible. The boundary of the largest region of dark ancient terrain on Ganymede can be seen to the east (right), revealing some of the light linear features which may be all that remains of a large ancient impact structure similar to the large ring structure... Keywords: What -- Ganymede; What -- Voyager 1; What -- Callisto; What -- Earth; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	AC79-7104 - NASA/Ames Research Center Photographer : JPL Range : 1,094,666 km (677,000 mi.) This false color picture of Callisto was taken by Voyager 2 and is centered on 11 degrees N and 171 degrees W. This rendition uses an ultraviolet image for the blue component. Because the surface displays regional contrast in UV, variations in surface materials are apparent. Notice in particular the dark blue haloes which surround bright craters in the eastern hemisphere... Keywords: What -- Callisto; What -- Voyager 2; What -- Mercury; What -- Mars; Where -- Jet Propulsion Laboratory (JPL) Downloads: 3
	Callisto Close-up with Jagged Hills - NASA/Jet Propulsion Laboratory (NASA-JPL) The highest-resolution views ever obtained of any of Jupiter's moons, taken by NASA's Galileo spacecraft in May 2001, reveal numerous bright, sharp knobs covering a portion of Jupiter's moon Callisto. The knobby terrain seen throughout the top inset is unlike any seen before on Jupiter's moons. The spires are very icy but also contain some darker dust. As the ice erodes, the dark material apparently slides down and collects in low-lying areas... Keywords: What -- Galileo; What -- Moon; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL); Where -- California; Where -- Washington Downloads: 1
	Callisto basin - NASA This picture of a multi=ring basin on Callisto was taken the morning of March 6, 1979, from a distance of about 200,000 km. The complicated circular structure seen at left center is similar to the large circular impact basins that dominate the surface of the Earth's moon and also the planet Mercury. The inner parts of these basins are generally surrounded by radially lineated ejecta and several concentric mountainous ring structures that are thought to form during the impact event... Keywords: What -- Callisto; What -- Moon; What -- Mercury; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL) Downloads: 1
	Ganymede - surface - NASA RIGHT: This picture shows part of the surface of Ganymede as viewed from a range-of 120,000 km by Voyager 2 on July 9th. In the foreground is typical grooved terrain as seen by Voyager 1. It consists of mutually intersecting bands of closely-spaced, parallel ridges and grooves. In the background is newly-cratered dark terrain across which can be traced several widely spaced parallel linear features... Keywords: What -- Ganymede; What -- Voyager 1; What -- TRACE; What -- Callisto; What -- Voyager 2 Downloads: 1
	Callisto's Icy Surface - NASA This color photo of Jupiter's satellite Callisto was made from three black-and-white images taken March 5 from a distance of 746,000 miles (1.2 million kilometers). It shows the entire hemisphere of Callisto that was photographed at high resolution by Voyager 1 during the close encounter with the satellite on March 6. Visible near the upper left limb is the large basin-like structure discovered by Voyager 1... Keywords: What -- Callisto; What -- Voyager 1; What -- Polar; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL) Downloads: 1
	Callisto False Color - NASA This false color picture of Callisto was taken by Voyager 2 on July 7, 1979 at a range of 1,094,666 kilometers (677,000 miles) and is centered on 11 degrees N and 171 degrees W. This rendition uses an ultraviolet image for the blue component. Because the surface displays regional contrast in UV, variations in surface materials are apparent. Notice in particular the dark blue haloes which surround bright craters in the eastern hemisphere... Keywords: What -- Callisto; What -- Voyager 2; What -- Moon; What -- Mercury; What -- Mars Downloads: 1
	Callisto's Valhalla impact structure - NASA A portion of the central zone of the large impact structure Valhalla on Jupiter's moon Callisto was imaged by the Galileo spacecraft on November 4, 1996. The area shown here is centered at 16 degrees north, 55 degrees west and is about seven miles (11 kilometers) across. This is the highest resolution picture ever taken of Callisto and shows features as small as 200 feet (60 meters) across. The formation of Valhalla occurred early in Callisto's history; however, the central zone shown here is pr... Keywords: What -- Moon; What -- Callisto; What -- Galileo; What -- Jupiter; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington Downloads: 1
	Callisto Scarp Mosaic - NASA This mosaic of two images shows an area within the Valhalla region on Jupiter's moon, Callisto. North is to the top of the mosaic and the Sun illuminates the surface from the left. The smallest details that can be discerned in this picture are knobs and small impact craters about 155 meters (170 yards) across. The resolution is 46 meters (50 yards) per picture element, and the mosaic covers an area approximately 33 kilometers (20 miles) across... Keywords: What -- Moon; What -- Callisto; What -- Sun; What -- Galileo; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington Downloads: 1
	Mass wasting in craters near the south pole of Callisto - NASA Craters ranging in diameter from the limit of resolution, approximately 1.35 kilometers (0.82 miles), up to the remnants of a heavily degraded two-ringed basin (center of the image), approximately 90 kilometers (55 miles) in diameter, can be seen in this image of a region near Callisto's south pole. Craters in this image exhibit a wide variety of degradational (erosional) states, including what appear to be landslide or slump deposits, best seen in the southwestern part of the bright 21 kilomete... Keywords: What -- Crater; What -- Galileo; What -- Jupiter; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington Downloads: 1
	Callisto From 8,023,000 kilometers - NASA This photo of Callisto, outermost of Jupiter's four Galilean satellites, was taken a few minutes after midnight (PST) Feb. 26 by Voyager 1. The distance to Callisto was 8,023,000 kilometers (4.98 million miles). The hemisphere in this picture shows a fairly uniform surface dotted with brighter spots that are up to several hundred kilometers across. Scientists believe the spots may be impact craters but higher-resolution photos will be necessary before the features can be interpreted... Keywords: What -- Callisto; What -- Voyager 1; What -- Mercury; What -- Moon; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL) Downloads: 1
	Callisto From 7,000,000 kilometers - NASA This Voyager 1 picture of Callisto, the outermost Galilean satellite, was taken February 28 from a distance of about 5 million miles (7 million kilometers). Callisto is the darkest of the Galilean satellites but is still nearly twice as bright as the Earth's Moon. The surface shows a mottled appearance consisting of bright and dark patches. The bright spots remind scientists of rayed or bright haloed craters, similar to those seen on the Earth's Moon... Keywords: What -- Voyager 1; What -- Callisto; What -- Moon; What -- Jupiter; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL) Downloads: 1
	Roma sotterranea : or, Some account of the Roman catacombs, especially of the cemetery of San Callisto ; comp. from the works of Commendatore de Rossi with the consent of the author - Rossi, Giovanni Battista de, 1822-1894 Includes bibliographical references and index Keywords: Cimitero di Callisto (Rome, Italy); Catacombs -- Italy Rome; Christian art and symbolism; Rome -- Antiquities Downloads: 734
	Rome souterraine : résumé des découvertes de M. de Rossi dans les catacombes romaines et en particulier dans le cimetière de Calliste - Rossi, Giovanni Battista de, 1822-1894 Includes bibliographical references and index Keywords: Cimitero di Callisto (Rome, Italy); Catacombs -- Italy Rome; Christian art and symbolism; Rome -- Antiquities Downloads: 225
	A79-7085 - NASA/Ames Research Center Photographer: JPL P-21756 BW only Range: 120,000 km (right) 169,000 km (left) Right: In the foreground of this picture taken by Voyager 2, the part of the surface of Ganymede shown is the typical grooved terrain as seen by Voyager 1. It consists of mutually intersecting bands of closely-spaced, parallel ridges and grooves. In the background is newly-cratered dark terrain across which can be traced several widely spaced parellel linear features... Keywords: What -- Voyager 1; What -- Ganymede; What -- TRACE; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL) Downloads: 7
	AC79-0164-2 - NASA/Ames Research Center Date: Feb 5, 1979 Photo by Voyager 1 (JPL) Jupiter, its Great Red Spot and three of its four largest satellites are visible in this photo taken Feb 5, 1979 by Voyager 1. The spacecraft was 28.4 million kilomters (17.5 million miles) from the planet at the time. The inner-most large satellite, Io, can be seen against Jupiter's disk. Io is distinguished by its bright, brown-yellow surface. To the right of Jupiter is the satellite Europa, also very bright but with fainter surface markings... Keywords: What -- Voyager 1; What -- Io; What -- Jupiter; What -- Callisto; What -- Moon; Where -- Jet Propulsion Laboratory (JPL) Downloads: 6
	NASA Imagery Sampler A montage of recent NASA imagery including the STS121 Shuttle launch, photos from the Spirit Rover on Mars, repairs to the International Space Station, Hubble Telescope photos of planetary nebulae, repairs to the Hubble Telescope using space walks and a robotic arm, pictures from the Mars Reconnaissance Orbiter, the Messenger mission to Mercury, and NASA's planned nuclear powered space engine to be used in exploring the moons of Jupiter. Keywords: nasa; mars; shuttle; space; jupiter; mercury; space station; callisto; ganymede; europa; planetary nebulae; hubble Downloads: 6,990 Average rating: (0 review)
	Ganymede - close up photos - NASA Two close-up photos of Ganymede, largest of Jupiter's 13 moons, were obtained on July 8 by Voyager 2 from 86,000 miles (top) and 192,000 miles. They show different views of the largest block of dark, heavily cratered terrain seen on the giant moon. The bottom image shows objects three to four miles across; has a resolution of about 1.5 miles. The light, linear stripes recurring across the dark region resemble the outer rings of the large ring structure on Callisto... Keywords: What -- Ganymede; What -- Voyager 2; What -- Moon; What -- Callisto; What -- TRACE Downloads: 2
	Asgard - NASA This four-frame mosaic shows the ancient impact structure Asgard on Jupiter's moon Callisto. This image is centered at 300N, 1420W. The Asgard structure is approximately 1700 kilometers across and consists of a bright central zone surrounded by discontinuous rings. The rings are tectonic features with scarps near the central zone and troughs at the outer margin. Several large impacts have smashed into Callisto after the formation of Asgard... Keywords: Solar System Exploration; Jet Propulsion Laboratory; Planets; What -- Moon; What -- Callisto; What -- Crater; What -- Galileo; What -- Jupiter
	Har Crater on Callisto - NASA/Jet Propulsion Laboratory (NASA-JPL) This image shows a heavily cratered region near Callisto's equator. It was taken by the Galileo spacecraft Solid State Imaging (CCD) system on its ninth orbit around Jupiter. North is to the top of the image. The 50 kilometer (30 mile) double ring crater in the center of the image is named Har. Har displays an unusual rounded mound on its floor. The origin of the mound is unclear but probably involves uplift of ice-rich materials from below, either as a "rebound" immediately following the impact... Keywords: What -- Galileo; What -- Jupiter; What -- Crater; What -- Sun; What -- Callisto; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington; Where -- California
	Asgard Scarp Mosaic - NASA/Jet Propulsion Laboratory (NASA-JPL) Low-resolution color data were combined with a higher resolution mosaic to produce this infrared composite image of a pair of ancient multi-ringed impact basins on Jupiter's moon, Callisto. The region imaged is on the leading hemisphere of Callisto near 26 degrees north, 142 degrees west, and is almost 1,400 kilometers (860 miles) across. North is toward the top of the picture and the Sun illuminates the surface from the east... Keywords: What -- Moon; What -- Callisto; What -- Sun; What -- Crater; What -- Galileo; What -- Jupiter; Where -- Jet Propulsion Laboratory (JPL); Where -- Washington
	Oberon at Voyager Closest Approach - NASA This Voyager 2 picture of Oberon is the best the spacecraft acquired of Uranus' outermost moon. The picture was taken shortly after 3:30 a.m. PST on Jan. 24, 1986, from a distance of 660,000 kilometers (410,000 miles). The color was reconstructed from images taken through the narrow-angle camera's violet, clear and green filters. The picture shows features as small as 12 km (7 mi) on the moon's surface... Keywords: What -- Voyager 2; What -- Oberon; What -- Uranus; What -- Moon; What -- Callisto; What -- Crater; What -- Voyager; Where -- Jet Propulsion Laboratory (JPL)