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

<h1>PIA03216: Ridges and Troughs in Sippar Sulcus, Ganymede</h1><div class="PIA03216" lang="en" style="width:404px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Embayment of ridges and troughs in a portion of the Sippar Sulcus area of Jupiter's moon Ganymede in this image from NASA's Galileo spacecraft is interpreted as evidence that the low-lying area was filled in by flooding with low-viscosity material, such as water or water-ice slush lavas. Bays of the material appeared to have formed in troughs (indicated by arrows) between the ridges.</p><p>The smallest features visible are about 180 meters (590 feet) across. Analysis of such high-resolution images in combination with estimates of the features' relative elevations is helping scientists interpret the roles of volcanism and tectonics in creating the bright terrain on Ganymede.</p><p>This image was prepared by the Lunar and Planetary Institute, Houston, and included in a report by Dr. Paul Schenk et al. in the March 1, 2001, edition of the journal Nature.</p><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>Images and data received from Galileo are posted on the Galileo mission home page at <a href="http://www2.jpl.nasa.gov/galileo/">http://www2.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/">http://www2.jpl.nasa.gov/galileo/sepo/</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03216" onclick="window.open(this.href); return false;" title="Voir l'image PIA03216: Ridges and Troughs in Sippar Sulcus, Ganymede sur le site de la NASA">Voir l'image PIA03216: Ridges and Troughs in Sippar Sulcus, Ganymede sur le site de la NASA.</a></div>
PIA03216: Ridges and Troughs in Sippar Sulcus, Ganymede
<h1>PIA03217: Caldera in Sippar Sulcus, Ganymede</h1><div class="PIA03217" lang="en" style="width:542px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>An irregularly shaped caldera, or pit, within the bright swath called Sippar Sulcus on Jupiter's moon Ganymede dominates this image taken by NASA's Galileo spacecraft. The high-standing interior of the caldera is interpreted as evidence of the flow of a viscous material.</p><p>Elevation modeling indicates the height of the westernmost caldera floor material (arrow) is comparable to adjacent grooved material but decreases towards the east (right), where it is similar to nearby, lower-lying smooth terrain. The smooth terrain, generally lacking grooves or stripes, extends across the upper half of the image and crosscuts a similar but grooved band at the lower right. Analysis of such high-resolution images in combination with estimates of the features' relative elevations is helping scientists interpret the roles of volcanism and tectonics in creating the bright terrain on Ganymede.</p><p>This image was prepared by the Lunar and Planetary Institute, Houston, and included in a report by Dr. Paul Schenk et al. in the March 1, 2001, edition of the journal Nature.</p><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>Images and data received from Galileo are posted on the Galileo mission home page at <a href="http://www2.jpl.nasa.gov/galileo/">http://www2.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/">http://www2.jpl.nasa.gov/galileo/sepo/</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03217" onclick="window.open(this.href); return false;" title="Voir l'image PIA03217: Caldera in Sippar Sulcus, Ganymede sur le site de la NASA">Voir l'image PIA03217: Caldera in Sippar Sulcus, Ganymede sur le site de la NASA.</a></div>
PIA03217: Caldera in Sippar Sulcus, Ganymede
<h1>PIA03218: Ganymede Topography</h1><div class="PIA03218" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This perspective view, simulating a low altitude flight over the surface of Ganymede, was made possible by topographic analysis of stereo images of the Sippar Sulcus region. Such a view was made possible when Galileo passed Ganymede in May 1997, providing a virtual second "eye" to Voyager's first view in 1979.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03218" onclick="window.open(this.href); return false;" title="Voir l'image PIA03218: Ganymede Topography sur le site de la NASA">Voir l'image PIA03218: Ganymede Topography sur le site de la NASA.</a></div>
PIA03218: Ganymede Topography
<h1>PIA09245: Ganymede</h1><div class="PIA09245" lang="en" style="width:380px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This is New Horizons' best image of Ganymede, Jupiter's largest moon, taken with the spacecraft's Long Range Reconnaissance Imager (LORRI) camera at 10:01 Universal Time on February 27 from a range of 3.5 million kilometers (2.2 million miles). The longitude of the disk center is 38 degrees West and the image scale is 17 kilometers (11 miles) per pixel. Dark patches of ancient terrain are broken up by swaths of brighter, younger material, and the entire icy surface is peppered by more recent impact craters that have splashed fresh, bright ice across the surface.</p><p>With a diameter of 5,268 kilometers (3.273 miles), Ganymede is the largest satellite in the solar system.</p><p>This is one of a handful of Jupiter system images already returned by New Horizons during its close approach to Jupiter. Most of the data being gathered by the spacecraft are stored onboard and will be downlinked to Earth during March and April 2007. </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA09245" onclick="window.open(this.href); return false;" title="Voir l'image PIA09245: Ganymede sur le site de la NASA">Voir l'image PIA09245: Ganymede sur le site de la NASA.</a></div>
PIA09245: Ganymede
<h1>PIA09356: Ganymede in Visible and Infrared Light</h1><div class="PIA09356" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This montage compares New Horizons' best views of Ganymede, Jupiter's largest moon, gathered with the spacecraft's Long Range Reconnaissance Imager (LORRI) and its infrared spectrometer, the Linear Etalon Imaging Spectral Array (LEISA). <p></p>LEISA observes its targets in more than 200 separate wavelengths of infrared light, allowing detailed analysis of their surface composition. The LEISA image shown here combines just three of these wavelengths -- 1.3, 1.8 and 2.0 micrometers -- to highlight differences in composition across Ganymede's surface. Blue colors represent relatively clean water ice, while brown colors show regions contaminated by dark material.<p></p>The right panel combines the high-resolution grayscale LORRI image with the color-coded compositional information from the LEISA image, producing a picture that combines the best of both data sets.<p></p>The LEISA and LORRI images were taken at 9:48 and 10:01 Universal Time, respectively, on February 27, 2007, from a range of 3.5 million kilometers (2.2 million miles). The longitude of the disk center is 38 degrees west. With a diameter of 5,268 kilometers (3,273 miles), Ganymede is the largest satellite in the solar system.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA09356" onclick="window.open(this.href); return false;" title="Voir l'image PIA09356: Ganymede in Visible and Infrared Light sur le site de la NASA">Voir l'image PIA09356: Ganymede in Visible and Infrared Light sur le site de la NASA.</a></div>
PIA09356: Ganymede in Visible and Infrared Light
Synthese_Ganymede.jpg
Synthese_Ganymede.jpg