Galerie de photos de Ganymède, satellite galiléen de la planète Jupiter

$<h1>PIA01616: Highly Fractured Dark and Bright Terrain</h1><div class="PIA01616" lang="en" style="width:506px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>View of a boundary between bright and dark terrain at the southern border of Galileo Regio on Jupiter's moon, Ganymede. A narrow, 15 kilometer wide, band of fractured bright terrain runs from the upper left to lower right of this image. The dark terrain on either side of this band of bright terrain has been highly fractured in multiple directions by tectonic activity. The large bright circular feature in the upper right is probably an impact crater that has been topographically relaxed, perhaps indicating that the subsurface was warm in this region at some point in its history before the formation of the bright terrain. Such images help determine how the ancient dark terrain on Ganymede was converted into younger bright terrain.</p><p>North is to the top of the picture and the sun illuminates the surface from nearly overhead. The image, centered at 7 degrees latitude and 157 degrees longitude, covers an area approximately 81 by 58 kilometers. The resolution is 160 meters per picture element. The image was taken on May 7, 1997 at 15 hours, 21 minutes, 16 seconds Universal Time at a range of 16218 kilometers by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft.</p><p>The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC.</p><p>This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL <a href="http://solarsystem.nasa.gov/galileo/" class="external free" target="wpext">http://solarsystem.nasa.gov/galileo/</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01616" onclick="window.open(this.href); return false;" title="Voir l'image PIA01616: Highly Fractured Dark and Bright Terrain sur le site de la NASA">Voir l'image PIA01616: Highly Fractured Dark and Bright Terrain sur le site de la NASA.</a></div>$ PIA01616: Highly Fractured Dark and Bright Terrain	$<h1>PIA01617: Marius Regio, Ganymede</h1><div class="PIA01617" lang="en" style="width:797px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This image shows a highly fractured lane of grooved terrain, Lagash Sulcus, which runs through an area of heavily cratered dark terrain within Marius Regio on Jupiter's moon Ganymede. The boundary between these two units is marked by a deep trough. Outside the groove lane, little fracturing is evident, suggesting that deformation is largely concentrated within the bright grooved area. The bright, heart-shaped feature just below the image center may be a patch of bright terrain, or the feature may be related to ancient impact event.</p><p>North is to the top of the picture and the sun illuminates the surface from the upper right. The image, centered at 17 degrees south latitude and 156 degrees longitude, covers an area approximately 230 by 230 kilometers. The resolution is 288 meters per picture element. The images were taken on June 6, 1997 at 14 hours, 56 minutes, 11 seconds Universal Time at a range of 28655 kilometers by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft.</p><p>The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC.</p><p>This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL <a href="http://galileo.jpl.nasa.gov">http:// galileo.jpl.nasa.gov</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01617" onclick="window.open(this.href); return false;" title="Voir l'image PIA01617: Marius Regio, Ganymede sur le site de la NASA">Voir l'image PIA01617: Marius Regio, Ganymede sur le site de la NASA.</a></div>$ PIA01617: Marius Regio, Ganymede
PIA01618: Regional View of Ganymede	$<h1>PIA01619: Morning in Tiamat Sulcus</h1><div class="PIA01619" lang="en" style="width:782px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>View of the Tiamat Sulcus region on Jupiter's moon, Ganymede, imaged just after local sunrise. The illumination from such a low sun angle highlights the grooved topography of Tiamat. Furrows and fractures are apparent in the surrounding dark terrain also. North-south trending Tiamat Sulcus is divided in two by Kishar Sulcus, which trends east-west. The southern portion of Tiamat is wider than its northern portion, indicating that there has been a greater degree of extension south of Kishar Sulcus than north of it. The portion of Kishar Sulcus to the right of Tiamat Sulcus appears to have slid horizontally (with respect to the left portion of Kishar Sulcus) along a northwest-southeast trending strike-slip fault.</p><p>North is to the top of the picture and the sun illuminates the surface from the right. The image, centered at 1 degree south latitude and 204 degrees longitude, covers an area approximately 386 by 387 kilometers. The resolution is 494 meters per picture element. The image was taken on May 7, 1997 at 14 hours, 15 minutes, 7 seconds Universal Time at a range of 48,859 kilometers by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft.</p><p>The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC.</p><p>This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL <a href="http://solarsystem.nasa.gov/galileo/" target="_blank">http://solarsystem.nasa.gov/galileo/</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01619" onclick="window.open(this.href); return false;" title="Voir l'image PIA01619: Morning in Tiamat Sulcus sur le site de la NASA">Voir l'image PIA01619: Morning in Tiamat Sulcus sur le site de la NASA.</a></div>$ PIA01619: Morning in Tiamat Sulcus
$<h1>PIA01620: Perspective View of Bright Ridges in Uruk Sulcus</h1><div class="PIA01620" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This image is a computer-generated perspective view of ridges in the Uruk Sulcus region of Jupiter's moon, Ganymede. This area is part of the bright grooved terrain that covers over half of Ganymede's surface, where the icy surface has been fractured and broken into many parallel ridges and troughs. Bright icy material is exposed in the crests of the ridges, while dark material has collected in low areas. The topographic information, which was generated from imaging of the same area on two successive flybys of Ganymede by NASA's Galileo spacecraft, reveals elevation differences of a few hundreds of meters between the highest and lowest points in this area.</p><p>The perspective view is looking toward the south, and the topography has been vertically exaggerated. The image is centered at 12°degrees latitude and 168°degrees longitude, and the finest details that can discerned in this picture are about 86 meters across. The image was taken on September 6, 1996 at 18 hours, 46 minutes, 57 seconds Universal Time at a range of 4196 kilometers by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft.</p><p>The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC.</p><p>This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL <a href="http://solarsystem.nasa.gov/galileo/" target="_blank">http://solarsystem.nasa.gov/galileo/</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01620" onclick="window.open(this.href); return false;" title="Voir l'image PIA01620: Perspective View of Bright Ridges in Uruk Sulcus sur le site de la NASA">Voir l'image PIA01620: Perspective View of Bright Ridges in Uruk Sulcus sur le site de la NASA.</a></div>$ PIA01620: Perspective View of Bright Ridges in Uruk Sulcus	PIA01658: Dome crater Neith on Jupiter's satellite Ganymede
PIA01659: Buto Facula - A palimpsest on Ganymede	PIA01660: Pedestal craters Gula and Achelous on Ganymede
PIA01666: Ganymede's Trailing Hemisphere	PIA01972: Ganymede
PIA02233: Ganymede - high resolution	PIA02252: Ganymede
PIA02278: Ganymede	PIA02279: Ganymede
PIA02281: Ganymede - surface	$<h1>PIA02282: Ganymede - close up photos</h1><div class="PIA02282" lang="en" style="width:547px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Two close-up photos of Ganymede, largest of Jupiter's 13 moons, were obtained on July 8 by Voyager 2 from 86,000 miles (top) and 192,000 miles. They show different views of the largest block of dark, heavily cratered terrain seen on the giant moon. The bottom image shows objects three to four miles across; has a resolution of about 1.5 miles. The light, linear stripes recurring across the dark region resemble the outer rings of the large ring structure on Callisto. If these features are in fact related to an ancient ring structure formed by a large impact, their small curvature suggests that the original structure was even larger than one seen on Callisto. There is no apparent trace now of the center of this suggested structure, which must have been destroyed by the resurfacing evident over most of Ganymede in the grooved terrain. Another interpretation is that these features are not impact-related rings but are internally produced fractures crossing the dark terrain, similar to the grooved bands.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02282" onclick="window.open(this.href); return false;" title="Voir l'image PIA02282: Ganymede - close up photos sur le site de la NASA">Voir l'image PIA02282: Ganymede - close up photos sur le site de la NASA.</a></div>$ PIA02282: Ganymede - close up photos
PIA02286: Ganymede varied terrain	PIA02571: Ganymede dark terrain at high resolution
PIA02572: Region of Ganymede with mix of terrains	$<h1>PIA02573: Regional view of bright and dark terrain</h1><div class="PIA02573" lang="en" style="width:772px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This view of the Nicholson Regio/Arbela Sulcus region on Jupiter's moon Ganymede, taken by NASA's Galileo spacecraft, shows the stark contrast between the smooth bright terrain and the surrounding highly fractured dark terrain.</p><p>This observation was designed in part to distinguish between different models for how Arbela Sulcus and other groove lanes on Ganymede were formed. The volcanic model suggests that a relatively clean, water-rich lava filled a tectonic depression, then cooled to create a smooth surface. Tectonic models suggest that focused faulting and deformation of older dark terrain destroyed the pre-existing texture, which was brightened by exposure of underlying, clean ice. Analysis of these photos suggests a third and unexpected possibility: Arbela Sulcus may be similar to some bands on another of Jupiter's moons, Europa, formed by tectonic crustal spreading and renewal.</p><p>North is to the upper left of the picture and the Sun illuminates the surface from the west. The image, centered at ?14 degrees latitude and 347 degrees longitude, covers an area approximately 258 by 116 kilometers (160 by 72 miles). The resolution is 133 meters (436 feet) per picture element. The images were taken on May 20, 2000, at a range of 13,100 kilometers (8,140 miles).</p><p>This image and other images and data received from Galileo are posted on the Galileo mission home page at <a href="http://www.jpl.nasa.gov/galileo">http://www.jpl.nasa.gov/galileo</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a><p>The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Galileo mission for NASA's Office of Space Science, Washington, D.C.</p><p>This image was produced by DLR (German Aerospace Center), Berlin, and Brown University, Providence, R.I., <a href="http://solarsystem.dlr.de/">http://solarsystem.dlr.de/</a> and<a href="http://www.planetary.brown.edu/">http://www.planetary.brown.edu/</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02573" onclick="window.open(this.href); return false;" title="Voir l'image PIA02573: Regional view of bright and dark terrain sur le site de la NASA">Voir l'image PIA02573: Regional view of bright and dark terrain sur le site de la NASA.</a></div>$ PIA02573: Regional view of bright and dark terrain
$<h1>PIA02574: Ganymede feature resembling Europa</h1><div class="PIA02574" lang="en" style="width:704px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This frame compares a high-resolution view of Arbela Sulcus on Jupiter's moon Ganymede (top) with the gray band Thynia Linea on another Jovian moon, Europa (bottom), shown to the same scale. Both images are from NASA's Galileo spacecraft.</p><p>Arbela Sulcus is one of the smoothest lanes of bright terrain identified on Ganymede, but subtle striations are apparent here along its length. This section of Arbela contrasts markedly from highly fractured terrain to its west and dark terrain to its east.</p><p>On Europa, gray bands such as Thynia Linea have formed by tectonic crustal spreading and renewal. Such bands have sliced through and completely separated pre-existing features in the surrounding bright, ridged plains. The younger prominent double ridge Delphi Flexus cuts across Thynia Linea. The scarcity of craters on Europa attests to the relative youth of its surface compared to Ganymede's.</p><p>Unusual for Ganymede, it is possible that Arbela Sulcus has formed by complete separation of Ganymede's icy crust, like bands on Europa. Tests of this idea come from detailed comparisons of their internal shapes and the relationships to the surrounding structures.</p><p>In the Ganymede image, north is to the top of the picture and the Sun illuminates the surface from the west. The image, centered at -15degrees latitude and 347 degrees longitude, covers an area approximately 34 by 26 kilometers (21 by 16 miles). The resolution is 34 meters (112 feet) per picture element. The image was taken on May 20, 2000, at a range of 3,370 kilometers (2,094 miles).</p><p>In the Europa image, north is to the upper-right of the picture and the Sun illuminates the surface from the northwest. The image, centered at-66 degrees latitude and 161 degrees longitude, covers an area approximately 44 by 46 kilometers (27 by 29 miles). The resolution is 45 meters (147 feet) per picture element. The image was taken on September 26, 1998, at a range of 3,817 kilometers (2,371 miles).</p><p>This image and other images and data received from Galileo are posted on the Galileo mission home page at <a href="http://www.jpl.nasa.gov/galileo">http://www.jpl.nasa.gov/galileo</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a><p>The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Galileo mission for NASA's Office of Space Science, Washington, D.C.</p><p>This image was produced by DLR (German Aerospace Center), Berlin, and Brown University, Providence, R.I., <a href="http://solarsystem.dlr.de/">http://solarsystem.dlr.de/</a> and<a href="http://www.planetary.brown.edu/">http://www.planetary.brown.edu/</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02574" onclick="window.open(this.href); return false;" title="Voir l'image PIA02574: Ganymede feature resembling Europa sur le site de la NASA">Voir l'image PIA02574: Ganymede feature resembling Europa sur le site de la NASA.</a></div>$ PIA02574: Ganymede feature resembling Europa	$<h1>PIA02575: Comparison of Ganymede and Europa features</h1><div class="PIA02575" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This image, taken by NASA's Galileo spacecraft, shows a same-scale comparison between Arbela Sulcus on Jupiter's moon Ganymede (left) and an unnamed band on another Jovian moon, Europa (right). Arbela Sulcus is one of the smoothest lanes of bright terrain identified on Ganymede, and shows very subtle striations along its length. Arbela contrasts markedly from the surrounding heavily cratered dark terrain.</p><p>On Europa, dark bands have formed by tectonic crustal spreading and renewal. Bands have sliced through and completely separated pre-existing features in the surrounding bright ridged plains. The scarcity of craters on Europa illustrates the relative youth of its surface compared to Ganymede's.</p><p>Unusual for Ganymede, it is possible that Arbela Sulcus has formed by complete separation of Ganymede's icy crust, like bands on Europa. Prominent fractures on either side of Arbela appear to have been offset by about 65 kilometers (about 40 miles) along the length of the area of furrows and ridges, suggesting that strike-slip faulting was important in the formation of Arbela Sulcus.</p><p>In the Ganymede image, north is to the upper left of the picture and the Sun illuminates the surface from the west. The image, centered at -14degrees latitude and 347 degrees longitude, covers an area approximately 258 by 116 kilometers (160 by 72 miles.) The resolution is 133 meters(436 feet) per picture element. The images were taken on May 20, 2000, at a range of 13,100 kilometers (8,100 miles).</p><p>In the Europa image, north is to the left of the picture and the Sun illuminates the surface from the east. The image, centered at -7 degrees latitude and 236 degrees longitude, covers an area approximately 275 by 424 kilometers (171 by 263 miles.) The resolution is 220 meters (about 720 feet) per picture element (re-sampled here to 133 meters, or 436 feet). The images were taken on Nov. 6, 1997, at a range of 21,500 kilometers (13,360 miles).</p><p>The Jet Propulsion Laboratory, Pasadena, Calif., manages the Galileo mission for NASA's Office of Space Science, Washington, DC. JPL is a division of the California Institute of Technology in Pasadena.</p><p>Images and data received from Galileo are posted on the Galileo mission home page at <a href="http://solarsystem.nasa.gov/galileo/" class="external free" target="wpext">http://solarsystem.nasa.gov/galileo/</a>. Background information and educational context for the images can be found at <a href="http://solarsystem.nasa.gov/galileo/gallery/index.cfm" class="external free" target="wpext">http://solarsystem.nasa.gov/galileo/gallery/index.cfm</a>.</p><p>Images were produced by Brown University, Providence, R.I., <a href="http://www.planetary.brown.edu/" class="external free" target="wpext">http://www.planetary.brown.edu/</a>, DLR (German Aerospace Center) Berlin, <a href="http://www.dlr.de/pf/" class="external free" target="wpext">http://www.dlr.de/pf/</a>, and University of Arizona, Tempe, <a href="http://www.lpl.arizona.edu/" class="external free" target="wpext">http://www.lpl.arizona.edu/</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02575" onclick="window.open(this.href); return false;" title="Voir l'image PIA02575: Comparison of Ganymede and Europa features sur le site de la NASA">Voir l'image PIA02575: Comparison of Ganymede and Europa features sur le site de la NASA.</a></div>$ PIA02575: Comparison of Ganymede and Europa features
PIA02576: Perspective view of Arbela Sulcus, Ganymede	$<h1>PIA02577: Bright-Dark terrain boundary, Ganymede</h1><div class="PIA02577" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The ancient, dark terrain of Nicholson Regio (left) shows many large impact craters, and zones of fractures oriented generally parallel to the boundary between the dark and bright regions of Jupiter's moon Ganymede. In contrast, the bright terrain of Harpagia Sulcus (right) is less cratered and relatively smooth.</p><p>The nature of the boundary between ancient, dark terrain and younger, bright terrain, the two principal terrain types on Ganymede, was explored by NASA's Galileo spacecraft on May 20, 2000. Subtle parallel ridges and grooves show that Harpagia Sulcus's land has been smoothed out over the years by tectonic processes.</p><p>North is to the top of the picture. The Sun illuminates the surface from the left. The image, centered at ?14 degrees latitude and 319 degrees longitude, covers an area approximately 213 by 97 kilometers (132 by 60 miles.) The resolution is 121 meters (about 250 feet) per picture element. The images were taken on May 20, 2000, at a range of 11,800 kilometers (about 7,300 miles).</p><p>The Jet Propulsion Laboratory, Pasadena, Calif., manages the Galileo mission for NASA's Office of Space Science, Washington, D.C. JPL is a division of the California Institute of Technology in Pasadena.</p><p>This image and other images and data received from Galileo are posted on the Galileo mission home page at <a href="http://www.jpl.nasa.gov/galileo">http://www.jpl.nasa.gov/galileo</a>. Background information and educational context for the images can be found at <a href="http://www2.jpl.nasa.gov/galileo/sepo/" target="_blank">http://www.jpl.nasa.gov/galileo/sepo</a><p>This image was produced by DLR (German Aerospace Center), Berlin,<a href="http://solarsystem.dlr.de/">http://solarsystem.dlr.de/</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02577" onclick="window.open(this.href); return false;" title="Voir l'image PIA02577: Bright-Dark terrain boundary, Ganymede sur le site de la NASA">Voir l'image PIA02577: Bright-Dark terrain boundary, Ganymede sur le site de la NASA.</a></div>$ PIA02577: Bright-Dark terrain boundary, Ganymede
PIA02578: Bright-Dark terrain boundary in stereo	PIA02579: Bright-dark boundary and topographical model
PIA02580: Caldera-like depression on Ganymede	PIA02581: Not-so-smooth bright terrain of Harpagia Sulcus
PIA02582: Stair-step scarps in dark terrain on Ganymede	PIA02862: Ganymede and Jupiter

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