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

Jupiter_Callisto_1.jpg	Jupiter_Callisto_2.jpg
Jupiter_Callisto_4.jpg	PIA00080: Callisto Mosaic
PIA00362: Callisto's Icy Surface	PIA00457: Callisto False Color
PIA00484: Concentric Rings Surrounding Valhalla	PIA00514: A Chain of Impact Craters on Callisto
PIA00516: Callisto's Valhalla impact structure	PIA00517: Asgard impact structure on Callisto
PIA00549: Callisto Crater Chain Mosaic	PIA00561: Callisto Scarp Mosaic
PIA00562: Asgard Scarp Mosaic	PIA00581: Callisto Crater Chain at High Resolution Shown in Context
PIA00745: Callisto's Equatorial Region	PIA00876: Craters near the south pole of Callisto
PIA00898: Moderate-resolution view of Callisto's surface	PIA01054: Har Crater on Callisto
PIA01055: View of Callisto from Voyager and Galileo	PIA01077: Large impact on Callisto`s southern hemisphere
PIA01095: Landslides on Callisto	PIA01100: The Asgard Hemisphere of Callisto
PIA01131: Interior of Callisto	PIA01219: Large Craters in Callisto's Southern Hemisphere
PIA01221: Heavy Cratering near Callisto's South Pole	PIA01222: Mass wasting in craters near the south pole of Callisto
$<h1>PIA01225: Craters in a Newly Imaged Area on Callisto</h1><div class="PIA01225" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">This two frame mosaic of images from NASA's Galileo spacecraft shows an area in the southern hemisphere of Jupiter's moon, Callisto, that was not imaged during the 1979 flyby of NASA's Voyager spacecraft. North is to the top of the image. Craters can be seen in this mosaic from less than 3 kilometers (Picture elements in this image are 0.93 kilometers (0.63 miles) across.) up to the 83 kilometer (51 mile) central dome crater Barri, just left (west) of the center of the mosaic. The ejecta (material thrown from the crater during its formation) from Barri can be seen as a diffuse halo or ring stretching to approximately one crater radius from the outer crater rim. The smaller, younger craters are brighter and have sharper, more pronounced rims. Thorir, a 43 kilometer (26 mile) crater just left of center, is cut by a central valley or fracture. This cross-cutting relationship indicates that Thorir is older than the event that produced this fracture. Scientists study the different crater morphologies (shapes) to determine crustal and surface conditions since the craters were formed on these icy moons.<p>This image was taken by the Galileo spacecraft's solid state imaging (CCD) system during its eighth orbit around Jupiter, on May 6th, 1997. The center of the image is located at 30.2 degrees south latitude, 66.1 degrees west longitude, and it was taken when the spacecraft was approximately 48,549 kilometers (29,615 miles) from Callisto.<p>The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.<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 http://galileo.jpl.nasa.gov. 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/PIA01225" onclick="window.open(this.href); return false;" title="Voir l'image PIA01225: Craters in a Newly Imaged Area on Callisto sur le site de la NASA">Voir l'image PIA01225: Craters in a Newly Imaged Area on Callisto sur le site de la NASA.</a></div>$ PIA01225: Craters in a Newly Imaged Area on Callisto	PIA01297: View of Callisto at Increasing Resolutions
$<h1>PIA01298: Global Color Variations on Callisto</h1><div class="PIA01298" lang="en" style="width:749px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Jupiter's icy moon Callisto is shown in approximate natural color (left) and in false color to enhance subtle color variations (right). This image of Callisto's Jupiter-facing hemisphere shows the ancient, multi-ring impact structure Valhalla just above the center of the image. Valhalla, possibly created by a large asteroid or comet which impacted Callisto, is the largest surface feature on this icy moon. Valhalla consists of a bright inner region, about 600 kilometers (360 miles) in diameter surrounded by concentric rings 3000 to 4000 kilometers (1800-2500 miles) in diameter. The bright central plains were possibly created by the excavation and ejection of "cleaner" ice from beneath the surface, with a fluid-like mass (impact melt) filling the crater bowl after impact. The concentric rings are fractures in the crust resulting from the impact.<p>The false color in the right image shows new information, including ejecta from relatively recent craters, which are often not apparent in the natural color image. The color also reveals a gradual variation across the moon's hemisphere, perhaps due to implantation of materials onto the surface from space.<p>These color images were obtained with the 1 micrometer (infrared), green, and violet filters of the Solid State Imaging (SSI) system on NASA's Galileo spacecraft. The false color is created from ratios of infrared/violet and its inverse (violet/infrared) which are then combined so the infrared/violet, green, and violet/infrared are assigned to red, green, and blue in a composite product.<p>North is to the top of the picture and the sun illuminates the surface from near the center, in the same way a full moon is seen from Earth when illuminated by the sun. The image, centered at 0.5 degrees south latitude and 56.3 degrees longitude, covers an area about 4800 by 4800 kilometers. The resolution is 14 kilometers per picture element. The images were taken on November 5, 1997 at a range of 68,400 kilometers (41,000 miles) during Galileo's eleventh orbit of Jupiter.<p>The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC. JPL is an operating division of California Institute of Technology (Caltech).<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 http://galileo.jpl.nasa.gov. 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/PIA01298" onclick="window.open(this.href); return false;" title="Voir l'image PIA01298: Global Color Variations on Callisto sur le site de la NASA">Voir l'image PIA01298: Global Color Variations on Callisto sur le site de la NASA.</a></div>$ PIA01298: Global Color Variations on Callisto	PIA01478: Callisto Cutaway with Ocean (Artist's Concept)

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