Cette galrie comprend des photos provenant des observations réalisées par le télescope spatial Hubble, de la mission MSG Mars Global Surveyor, quelques photos de Mariner, de Mars Express et des phtos diverses.

Galerie de photos de la planète Mars

<h1>PIA03620: Mars at Ls 341°: Tharsis</h1><div class="PIA03620" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>6 December 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 341° during a previous Mars year. This month, Mars looks similar, as Ls 341° occurs in mid-December 2005. The picture shows the Tharsis face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03620" onclick="window.open(this.href); return false;" title="Voir l'image PIA03620: Mars at Ls 341°: Tharsis sur le site de la NASA">Voir l'image PIA03620: Mars at Ls 341°: Tharsis sur le site de la NASA.</a></div>
PIA03620: Mars at Ls 341°: Tharsis
<h1>PIA03639: Mars at Ls 341°: Acidalia/Mare Erythraeum</h1><div class="PIA03639" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>13 December 2005<br />This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a banded surface in Argyre Planitia, the second largest impact basin in the martian southern hemisphere. The bands are the erosional expression of layered, perhaps sedimentary, rock.</p><p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03639" onclick="window.open(this.href); return false;" title="Voir l'image PIA03639: Mars at Ls 341°: Acidalia/Mare Erythraeum sur le site de la NASA">Voir l'image PIA03639: Mars at Ls 341°: Acidalia/Mare Erythraeum sur le site de la NASA.</a></div>
PIA03639: Mars at Ls 341°: Acidalia/Mare Erythraeum
<h1>PIA03659: Mars at Ls 357°: Acidalia/Mare Erythraeum</h1><div class="PIA03659" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>10 January 2006<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 357° during a previous Mars year. This month, Mars looks similar, as Ls 357° occurs in mid-January 2006. The picture shows the Acidalia/Mare Erythraeum face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03659" onclick="window.open(this.href); return false;" title="Voir l'image PIA03659: Mars at Ls 357°: Acidalia/Mare Erythraeum sur le site de la NASA">Voir l'image PIA03659: Mars at Ls 357°: Acidalia/Mare Erythraeum sur le site de la NASA.</a></div>
PIA03659: Mars at Ls 357°: Acidalia/Mare Erythraeum
<h1>PIA03675: Mars at Ls 357°: Syrtis Major</h1><div class="PIA03675" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>17 January 2006<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 357° during a previous Mars year. This month, Mars looks similar, as Ls 357° occurs in mid-January 2006. The picture shows the Syrtis Major face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03675" onclick="window.open(this.href); return false;" title="Voir l'image PIA03675: Mars at Ls 357°: Syrtis Major sur le site de la NASA">Voir l'image PIA03675: Mars at Ls 357°: Syrtis Major sur le site de la NASA.</a></div>
PIA03675: Mars at Ls 357°: Syrtis Major
<h1>PIA03691: 2 Years on Mars! Meridiani Planum Features Investigated by the Rover, Opportunity</h1><div class="PIA03691" lang="en" style="width:420px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p> <a href="/figures/PIA03691_fig1.jpg"></a> <a href="/figures/PIA03691_fig2.jpg"></a> <a href="/figures/PIA03691_fig3.jpg"></a>Figure 1<a href="/figures/PIA03691_fig1.jpg"><br />Annotated Image<br /><br /></a></a>Figure 2<a href="/figures/PIA03691_fig2.jpg"><br />Narrow Angle Component</a><br />(non-stereo image)</a>Figure 3<a href="/figures/PIA03691_fig3.jpg"><br />Narrow Angle Component</a><br />(non-stereo image)</p><p>24 January 2006<br />Two years ago, the Mars Exploration Rover, Opportunity, landed on Meridiani Planum. The rover marked its first Mars-year (687 Earth Days) anniversary in December 2005. Two pictures are shown here: the one on the right is the same as that on the left, except that key features have been labeled. Both pictures include a colored portion -- a 3-d (stereo) anaglyph which can be viewed using "3-d" glasses with a red left eye and a blue right eye. Figures 2 and 3 are MOC narrow angle non-stereo images.</p><p>During the landing in January 2004, rockets were fired to slow the final descent, just before the inflated airbags (containing the folded-up lander and rover) were released. The rockets disturbed the sandy surface at the location labeled "blast effects." Following release, the airbags bounced and rolled until coming to rest inside Eagle Crater. The lander, in fact, can be seen as a bright spot near the center of Eagle Crater. Meanwhile, the jettisoned parachute and backshell landed to the southwest of Eagle, and the heatshield fell just southwest of Endurance Crater.</p><p>Opportunity initially examined sedimentary rock outcrops and sandy, windblown regolith within Eagle Crater. Then it was driven by the rover team out of Eagle and on into Endurance Crater. By the end of 2004, Opportunity had left Endurance and was investigating the site where the heatshield impacted the surface. After that, the rover spent much of the year 2005 driving from the heatshield location down to the shallow Erebus Crater. Long-term plans call for driving Opportunity from Erebus to Victoria Crater, where a substantially thicker sequence of layered rock is expected to be found, relative to previous outcrops examined in the craters Endurance and Eagle.</p><p>Location near: 2.0°S, 5.6°W <br />Image width: 300 m scale bar = 984 ft <br />Illumination from: left <br /></p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03691" onclick="window.open(this.href); return false;" title="Voir l'image PIA03691: 2 Years on Mars! Meridiani Planum Features Investigated by the Rover, Opportunity sur le site de la NASA">Voir l'image PIA03691: 2 Years on Mars! Meridiani Planum Features Investigated by the Rover, Opportunity sur le site de la NASA.</a></div>
PIA03691: 2 Years on Mars! Meridiani Planum Features Investigated by the Rover, Opportunity
<h1>PIA03696: Mars at Ls 357°: Elysium/Mare Cimmerium</h1><div class="PIA03696" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>25 January 2006<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 357° during a previous Mars year. This month, Mars looks similar, as Ls 357° occurred in mid-January 2006. The picture shows the Elysium/Mare Cimmerium face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn. </p><p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03696" onclick="window.open(this.href); return false;" title="Voir l'image PIA03696: Mars at Ls 357°: Elysium/Mare Cimmerium sur le site de la NASA">Voir l'image PIA03696: Mars at Ls 357°: Elysium/Mare Cimmerium sur le site de la NASA.</a></div>
PIA03696: Mars at Ls 357°: Elysium/Mare Cimmerium
<h1>PIA03750: Volcanoes Ceraunius Tholus and Uranius Tholus</h1><div class="PIA03750" lang="en" style="width:662px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Acquired in March 2002, this Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle view shows the martian volcanoes, Ceraunius Tholus (lower) and Uranius Tholus (upper). The presence of impact craters on these volcanoes, particularly on Uranius Tholus; indicates that they are quite ancient and are not active today. The light-toned area on the southeastern face (toward lower right) of Ceraunius Tholus is a remnant of a once more extensive deposit of dust from the global dust storm events that occurred in 2001. The crater at the summit of Ceraunius Tholus is about 25 km (15.5 mi) across. Sunlight illuminates the scene from the lower left.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03750" onclick="window.open(this.href); return false;" title="Voir l'image PIA03750: Volcanoes Ceraunius Tholus and Uranius Tholus sur le site de la NASA">Voir l'image PIA03750: Volcanoes Ceraunius Tholus and Uranius Tholus sur le site de la NASA.</a></div>
PIA03750: Volcanoes Ceraunius Tholus and Uranius Tholus
<h1>PIA03755: Global Views of Mars in late Northern Summer</h1><div class="PIA03755" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Mars Global Surveyor (MGS) orbits around the red planet 12 times a day. Each orbit goes from pole to pole. Over the course of a single day, the wide angle cameras of the Mars Orbiter Camera (MOC) system take 24 pictures--12 red and 12 blue--that are assembled to create a daily global map. Such global views are used to monitor the martian weather and observe changes in the patterns of frost and dust distribution on the surface. These two pictures are examples of what Mars looks like in late northern summer, which is also late southern winter. At this time of year, the south polar cap (bottom, white feature in each image) is very large, extending from the south pole northward to 60°S. Also at this time of year, clouds of water ice crystals are common over the four largest volcanoes in Tharsis. The picture on the right shows Tharsis, with the four volcanoes forming a triangle resembling the pattern of holes on a bowling ball. The image on the left is centered on Syrtis Major, a dark, windswept volcanic plain so large that it has been known to science since the first telescopes were turned toward Mars in the 1600s. The elliptical bright feature at lower-center in the left image is the Hellas Basin, the largest unequivocal impact basin (formed by an asteroid or comet) on the planet. Hellas is approximately 2200 km (1,370 mi) across.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03755" onclick="window.open(this.href); return false;" title="Voir l'image PIA03755: Global Views of Mars in late Northern Summer sur le site de la NASA">Voir l'image PIA03755: Global Views of Mars in late Northern Summer sur le site de la NASA.</a></div>
PIA03755: Global Views of Mars in late Northern Summer
<h1>PIA03778: Northern Terra Meridiani's "Monument Valley"</h1><div class="PIA03778" lang="en" style="width:719px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Northern Terra Meridiani, near the intersection of the martian equator and prime meridian, is a region of vast exposures of layered rock. A thermal image from the Phobos 2 orbiter in 1989 showed these materials to be anomalously cool during the daytime, an observation very suggestive of dense, hardened materials like rock. Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) images of this region show layered material exposed in cliffs, buttes, and mesas that in some ways resemble the rock outcrops of northern Arizona and southeastern Utah in North America (e.g., Monument Valley, Canyonlands, Zion National Park, Four Corners). MGS MOC Extended Mission operations have included several hundred opportunities for the spacecraft to be rolled off-nadir (i.e., at an angle other than "straight down") to take pictures that repeat earlier MOC coverage. These repeat images, because they are taken from a different angle, can be combined with the original picture to produce a stereoscopic ("3-D") view. The image shown here is a composite of two pictures, the first taken October 23, 2000, the second acquired by pointing the spacecraft off-nadir on May 15, 2001. This view shows four buttes and a pinnacle (near left-center) composed of eroded, layered rock. The four buttes are each capped by the remains of a single layer of rock that is harder than the materials beneath it. It is the presence of this cap rock that has permitted these buttes to remain standing after surrounding materials were eroded away. Like the buttes of Monument Valley in the Navajo Nation on the Arizona/Utah border, these are believed to consist of sedimentary rocks, perhaps deposited in water or by wind, though some scientists have speculated that they could be made of thick accumulations of volcanic ash. The image covers an area approximately 3 km (1.9 mi) across and is illuminated by sunlight from the left. To see the image in 3-D, red (left-eye) and blue (right-eye) "3-D" glasses are required.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03778" onclick="window.open(this.href); return false;" title="Voir l'image PIA03778: Northern Terra Meridiani's "Monument Valley" sur le site de la NASA">Voir l'image PIA03778: Northern Terra Meridiani's "Monument Valley" sur le site de la NASA.</a></div>
PIA03778: Northern Terra Meridiani's "Monument Valley"
<h1>PIA03780: Nirgal Vallis and its Windblown Dunes</h1><div class="PIA03780" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">The wide angle cameras of the Mars Orbiter Camera (MOC) system onboard Mars Global Surveyor (MGS) are used every day to gather a global view of changes occurring in martian weather and surface frost patterns. Late in June 2001, as southern winter transitioned to spring, dust storm activity began to pick up as cold air from the south polar cap moved northward toward the warmer air at the martian equator. By early July, dust storms had popped up all over the planet, particularly throughout the southern hemisphere and in the Elysium/Amazonis regions of the northern hemisphere. Soon, the entire planet--except the south polar cap--was enshrouded in dust. Similar storms have occurred before. For example, the planet was obscured by dust when the Mariner 9, Mars 2, and Mars 3 spacecraft reached the planet in late 1971. The MGS MOC images showed the evolution of the 2001 great dust storm period. There was never a time when the entire planet was in the midst of a single storm. Several large storms would occur at the same time, and dust was kicked high into the atmosphere to cause much of the rest of the planet to be obscured. The dust storms largely subsided by late September 2001, but the atmosphere remained hazy into November of that year. The two pictures shown here come from the E05 (June 2001) and E06 (July 2001) subphases of the MGS MOC Extended Mission. The view from June shows the Tharsis volcanic region (left), Valles Marineris chasms (right) and the late winter south polar cap (bottom). The view from July shows the same regions, but most of the details are hidden by dust storms and haze.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03780" onclick="window.open(this.href); return false;" title="Voir l'image PIA03780: Nirgal Vallis and its Windblown Dunes sur le site de la NASA">Voir l'image PIA03780: Nirgal Vallis and its Windblown Dunes sur le site de la NASA.</a></div>
PIA03780: Nirgal Vallis and its Windblown Dunes
<h1>PIA03872: 18,812 New MGS MOC Images Archived and Online</h1><div class="PIA03872" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>With the release this month (October 2002) of the latest installment of 18,812 images, the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) passes another major milestone: more than 100,000 images have been validated and archived with the NASA Planetary Data System. The total number of archived images now available on-line is 112,218--more than twice the number of pictures acquired by the two Viking orbiters in 1976-1980. These pictures, from MOC extended mission subphases E07 through E12, were acquired August 2001 through January 2002. Every six months, after a six-month, labor-intensive archiving effort, the MOC team releases six months-worth of validated data to the NASA Planetary Data System.<p>Mars Global Surveyor is now in its sixth year orbiting the red planet. MGS reached Mars on 12 September 1997. The first MOC images were obtained on 15 September 1997.<p>The two pictures shown here were taken by the MOC narrow angle (high resolution) camera and "colorized" by applying the colors of Mars obtained by the MOC wide angle cameras. Both pictures show gullies on the walls of two different meteor impact craters that occur in Newton Basin in Sirenum Terra, Mars. The picture on the left, showing gullies in a crater at 42.4°S, 158.2°W, exhibits patches of wintertime frost on the crater wall, and dark-toned sand dunes on the floor. The picture on the right, from a crater at 39.0°S, 166.1°W, is one of the highest-resolution images obtained from Mars. Its resolution is 1.5 meters (5 feet) per pixel--objects the size of school buses can be resolved in the full size image. The gullies in these craters originate at a specific layer and may have formed by release of groundwater to the martian surface in geologically recent times.<p>MOC data from E07 through E12 include many exciting observations of the 2001 planet-enshrouding dust storm events, springtime retreat of the south polar seasonal frost cap, hundreds of images designed to monitor the retreat of carbon dioxide ice cliffs in the south polar residual cap, images obtained to look for changes and stereo views of gullies, pictures of proposed and potential Mars Exploration Rover landing sites, and more. Several previous MGS MOC releases highlighted these diverse E07-E12 observations:<p><a href="/catalog/PIA03169">PIA03169</a><br> Springtime on the Martian South Polar Cap<a href="/catalog/PIA03170">PIA03170</a><br> The 2001 Great Dust Storms - Hellas/Syrtis Major<a href="/catalog/PIA03171">PIA03171</a><br> The 2001 Great Dust Storms - Tharsis<a href="/catalog/PIA03178">PIA03178</a><br> MOC's 100,000th Image<a href="/catalog/PIA03179">PIA03179</a><br> MOC Observes Changes in the South Polar Cap: Evidence for Recent Climate Change on Mars<a href="/catalog/PIA03471">PIA03471</a><br> Changes in South Polar Carbon Dioxide Ice Cap<a href="/catalog/PIA03472">PIA03472</a><br> Stereo View of Layer Outcrops in Iani Chaos<a href="/catalog/PIA03753">PIA03753</a><br> Gullies and Streaks on Crater wall Kaiser<a href="/catalog/PIA03496">PIA03496</a><br> Southern Hemisphere Polygonal Patterned Ground<a href="/catalog/PIA03918">PIA03918</a><br> "Inca City" is Part of a Circular Feature<p>Malin Space Science Systems and the California Institute of Technology built the MOC using spare hardware from the Mars Observer mission. MSSS operates the camera from its facilities in San Diego, CA. The Jet Propulsion Laboratory's Mars Surveyor Operations Project operates the Mars Global Surveyor spacecraft with its industrial partner, Lockheed Martin Astronautics, from facilities in Pasadena, CA and Denver, CO.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03872" onclick="window.open(this.href); return false;" title="Voir l'image PIA03872: 18,812 New MGS MOC Images Archived and Online sur le site de la NASA">Voir l'image PIA03872: 18,812 New MGS MOC Images Archived and Online sur le site de la NASA.</a></div>
PIA03872: 18,812 New MGS MOC Images Archived and Online
<h1>PIA03923: Mars at Ls 211°</h1><div class="PIA03923" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>31 May 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 211° during a previous Mars year. This month, Mars looks similar, as Ls 211° occurred in mid-May 2005. The picture shows the south polar region of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03923" onclick="window.open(this.href); return false;" title="Voir l'image PIA03923: Mars at Ls 211° sur le site de la NASA">Voir l'image PIA03923: Mars at Ls 211° sur le site de la NASA.</a></div>
PIA03923: Mars at Ls 211°
<h1>PIA03929: Mars at Ls 230°: Tharsis</h1><div class="PIA03929" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>7 June 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 230° during a previous Mars year. This month, Mars looks similar, as Ls 230° occurs in mid-June 2005. The picture shows the Tharsis face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Location near: 20.8°S, 30.0°W <br />Image width: ~3 km (~1.9 mi <br />Illumination from: upper left <br />Season: Northern Autumn/Southern Spring <br /></p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03929" onclick="window.open(this.href); return false;" title="Voir l'image PIA03929: Mars at Ls 230°: Tharsis sur le site de la NASA">Voir l'image PIA03929: Mars at Ls 230°: Tharsis sur le site de la NASA.</a></div>
PIA03929: Mars at Ls 230°: Tharsis
<h1>PIA03947: Mars at Ls 230°: Acidalia/Mare Erythraeum</h1><div class="PIA03947" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>14 June 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 230° during a previous Mars year. This month, Mars looks similar, as Ls 230° occurs in mid-June 2005. The picture shows the Acidalia/Mare Erythraeum face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03947" onclick="window.open(this.href); return false;" title="Voir l'image PIA03947: Mars at Ls 230°: Acidalia/Mare Erythraeum sur le site de la NASA">Voir l'image PIA03947: Mars at Ls 230°: Acidalia/Mare Erythraeum sur le site de la NASA.</a></div>
PIA03947: Mars at Ls 230°: Acidalia/Mare Erythraeum
<h1>PIA03960: Mars at Ls 230°: Syrtis Major</h1><div class="PIA03960" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>21 June 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 230° during a previous Mars year. This month, Mars looks similar, as Ls 230° occurs in mid-June 2005. The picture shows the Syrtis Major face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03960" onclick="window.open(this.href); return false;" title="Voir l'image PIA03960: Mars at Ls 230°: Syrtis Major sur le site de la NASA">Voir l'image PIA03960: Mars at Ls 230°: Syrtis Major sur le site de la NASA.</a></div>
PIA03960: Mars at Ls 230°: Syrtis Major
<h1>PIA03972: Mars at Ls 230°: Elysium/Mare Cimmerium</h1><div class="PIA03972" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>28 June 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 230° during a previous Mars year. This month, Mars looks similar, as Ls 230° occurred in mid-June 2005. The picture shows the Elysium/Mare Cimmerium face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03972" onclick="window.open(this.href); return false;" title="Voir l'image PIA03972: Mars at Ls 230°: Elysium/Mare Cimmerium sur le site de la NASA">Voir l'image PIA03972: Mars at Ls 230°: Elysium/Mare Cimmerium sur le site de la NASA.</a></div>
PIA03972: Mars at Ls 230°: Elysium/Mare Cimmerium
<h1>PIA03985: Mars at Ls 249°: Tharsis</h1><div class="PIA03985" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>5 July 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 249° during a previous Mars year. This month, Mars looks similar, as Ls 249° occurs in mid-July 2005. The picture shows the Tharsis face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03985" onclick="window.open(this.href); return false;" title="Voir l'image PIA03985: Mars at Ls 249°: Tharsis sur le site de la NASA">Voir l'image PIA03985: Mars at Ls 249°: Tharsis sur le site de la NASA.</a></div>
PIA03985: Mars at Ls 249°: Tharsis
<h1>PIA03996: Mars at Ls 249°: Acidalia/Mare Erythraeum</h1><div class="PIA03996" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>12 July 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 249° during a previous Mars year. This month, Mars looks similar, as Ls 249° occurs in mid-July 2005. The picture shows the Acidalia/Mare Erythraeum face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA03996" onclick="window.open(this.href); return false;" title="Voir l'image PIA03996: Mars at Ls 249°: Acidalia/Mare Erythraeum sur le site de la NASA">Voir l'image PIA03996: Mars at Ls 249°: Acidalia/Mare Erythraeum sur le site de la NASA.</a></div>
PIA03996: Mars at Ls 249°: Acidalia/Mare Erythraeum
<h1>PIA04050: Springtime North Polar Dust Storms</h1><div class="PIA04050" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">MGS MOC Release No. MOC2-321, 12 December 2002<p>As on the Earth, many severe storms brew in the martian polar regions. Here, temperature contrasts between the cold carbon dioxide ("dry ice") seasonal frost cap and the warm ground adjacent to it--combined with a flow of cool polar air evaporating off the cap--sweeps up dust and funnels it into swirling dust storms along the cap edge. The dust storms shown here were observed during the recent northern spring by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) in May 2002. The picture is a mosaic of daily global images from the MOC wide angle cameras. The north polar cap is the bright, frosty surface at the top.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04050" onclick="window.open(this.href); return false;" title="Voir l'image PIA04050: Springtime North Polar Dust Storms sur le site de la NASA">Voir l'image PIA04050: Springtime North Polar Dust Storms sur le site de la NASA.</a></div>
PIA04050: Springtime North Polar Dust Storms
<h1>PIA04053: The Martian Northern Plains</h1><div class="PIA04053" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">MGS MOC Release No. MOC2-324, 12 December 2002<p>The martian northern plains remain nearly as mysterious today as they seemed 25 years ago during the Viking missions, even though one of those spacecraft--the Viking 2 lander--went to the northern plains. The northern plains are a lowland with fewer impact craters exposed at the surface than the heavily cratered martian southern highlands. Normally, surfaces with fewer craters are considered younger (i.e., they have had less time to accumulate craters). Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) high resolution images have shown that there really are a lot of craters in this region, but most are thinly buried beneath the plains. This low resolution view, covering an area 168 km (104 mi) by 124 km (77 km), shows a few craters at the surface (such as the one at the center of the image), and several circular features that represent craters that are mostly buried beneath the plains. This view was obtained in August 2002; sunlight illuminates the scene from the lower left.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04053" onclick="window.open(this.href); return false;" title="Voir l'image PIA04053: The Martian Northern Plains sur le site de la NASA">Voir l'image PIA04053: The Martian Northern Plains sur le site de la NASA.</a></div>
PIA04053: The Martian Northern Plains
<h1>PIA04109: Mars at Ls 249°: Syrtis Major</h1><div class="PIA04109" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>19 July 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 249° during a previous Mars year.</p><p>This month, Mars looks similar, as Ls 249° occurs in mid-July 2005. The picture shows the Syrtis Major face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04109" onclick="window.open(this.href); return false;" title="Voir l'image PIA04109: Mars at Ls 249°: Syrtis Major sur le site de la NASA">Voir l'image PIA04109: Mars at Ls 249°: Syrtis Major sur le site de la NASA.</a></div>
PIA04109: Mars at Ls 249°: Syrtis Major
<h1>PIA04117: Mars at Ls 249°: Elysium/Mare Cimmerium</h1><div class="PIA04117" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>26 July 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 249° during a previous Mars year. This month, Mars looks similar, as Ls 249° occurred in mid-July 2005. The picture shows the Elysium/Mare Cimmerium face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: Northern Autumn/Southern Spring </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04117" onclick="window.open(this.href); return false;" title="Voir l'image PIA04117: Mars at Ls 249°: Elysium/Mare Cimmerium sur le site de la NASA">Voir l'image PIA04117: Mars at Ls 249°: Elysium/Mare Cimmerium sur le site de la NASA.</a></div>
PIA04117: Mars at Ls 249°: Elysium/Mare Cimmerium
<h1>PIA04131: Mars at Ls 269°: Tharsis</h1><div class="PIA04131" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>2 August 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 269° during a previous Mars year. This month, Mars looks similar, as Ls 269° occurs in mid-August 2005. The picture shows the Tharsis face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: last days of Northern Autumn/Southern Spring</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04131" onclick="window.open(this.href); return false;" title="Voir l'image PIA04131: Mars at Ls 269°: Tharsis sur le site de la NASA">Voir l'image PIA04131: Mars at Ls 269°: Tharsis sur le site de la NASA.</a></div>
PIA04131: Mars at Ls 269°: Tharsis
<h1>PIA04138: Mars at Ls 269°: Acidalia/Mare Erythraeum</h1><div class="PIA04138" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>9 August 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 269° during a previous Mars year. This month, Mars looks similar, as Ls 269° occurs in mid-August 2005. The picture shows the Acidalia/Mare Erythraeum face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: last days of Northern Autumn/Southern Spring </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04138" onclick="window.open(this.href); return false;" title="Voir l'image PIA04138: Mars at Ls 269°: Acidalia/Mare Erythraeum sur le site de la NASA">Voir l'image PIA04138: Mars at Ls 269°: Acidalia/Mare Erythraeum sur le site de la NASA.</a></div>
PIA04138: Mars at Ls 269°: Acidalia/Mare Erythraeum
<h1>PIA04149: Mars at Ls 269°: Syrtis Major</h1><div class="PIA04149" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>16 August 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 269° during a previous Mars year. This month, Mars looks similar, as Ls 269° occurs in mid-August 2005. The picture shows the Syrtis Major face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: last days of Northern Autumn/Southern Spring </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04149" onclick="window.open(this.href); return false;" title="Voir l'image PIA04149: Mars at Ls 269°: Syrtis Major sur le site de la NASA">Voir l'image PIA04149: Mars at Ls 269°: Syrtis Major sur le site de la NASA.</a></div>
PIA04149: Mars at Ls 269°: Syrtis Major
<h1>PIA04165: Mars at Ls 269°: Elysium/Mare Cimmerium</h1><div class="PIA04165" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>23 August 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 269° during a previous Mars year. This month, Mars looks similar, as Ls 269° occurred in mid-August 2005. The picture shows the Elysium/Mare Cimmerium face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: last days of Northern Autumn/Southern Spring </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04165" onclick="window.open(this.href); return false;" title="Voir l'image PIA04165: Mars at Ls 269°: Elysium/Mare Cimmerium sur le site de la NASA">Voir l'image PIA04165: Mars at Ls 269°: Elysium/Mare Cimmerium sur le site de la NASA.</a></div>
PIA04165: Mars at Ls 269°: Elysium/Mare Cimmerium
<h1>PIA04177: Mars at Ls 269°: South Polar Region</h1><div class="PIA04177" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>30 August 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 269° during a previous Mars year. This month, Mars looks similar, as Ls 269° occurred in mid-August 2005. The picture shows the south polar region of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.</p><p>Season: last days of Northern Autumn/Southern Spring </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04177" onclick="window.open(this.href); return false;" title="Voir l'image PIA04177: Mars at Ls 269°: South Polar Region sur le site de la NASA">Voir l'image PIA04177: Mars at Ls 269°: South Polar Region sur le site de la NASA.</a></div>
PIA04177: Mars at Ls 269°: South Polar Region
<h1>PIA04268: A Mid-Northern Summer/Southern Winter's Mars</h1><div class="PIA04268" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) began its daily global imaging campaign four years ago, on March 9, 1999. Since that time, slightly more than 2 full Martian years have elapsed, and MOC has obtained a complete daily record of the red planet's ever-changing weather patterns. Observing Mars every day over many years is critical to understanding how to forecast weather that may occur in the future, and MOC is the only U.S. instrument slated to orbit Mars until late 2006 that can provide this information. For example, the MOC team has found that many weather events repeat from one year to the next. Such knowledge is useful in considering where future spacecraft might land on Mars--a site that is known to experience a dust storm each year during the period a lander or rover will be operational might not be a good place to land.</p><p>The six views of Mars shown here are a composite of the 24 daily global images acquired by MOC on February 14, 2003. At this time, it was the middle of summer in the northern hemisphere, and the middle of winter in the south. Taken together, the six views show the entire planet, its albedo (bright and dark) features, polar frosts, and cloud patterns. Water-ice clouds dominate the martian atmosphere over the tropical and sub-tropical latitudes, while orographically-generated (i.e. those associated with high-standing topography) water-ice clouds hang over each of the large volcanoes of the Tharsis and Elysium regions (see top-left, top-center, bottom-right).</p><p>In the north polar region, the residual water-ice cap is fully exposed. In the southern hemisphere, the winter-time seasonal carbon dioxide frost cap can be seen, extending from the south pole (which is in darkness and not seen in these images) northward to 50°S latitude. In the deep Hellas Basin (an ancient, giant impact scar seen as the bright elliptical feature at the bottom of the bottom-center image), the winter-time cap extends northward to 31°S because the lower elevation permits carbon dioxide to freeze at slightly higher temperatures than at the high elevations elsewhere in the southern hemisphere.</p><p>When these pictures were taken on February 14, 2003, dust storm activity was at a minimum and isolated to early morning hours around the edges of the north polar cap. Within a day, however, dust storm activity began to pick up in both hemispheres--as was expected from previous MOC images at this time of year in 1999 and 2001--and dust storms remained active through the rest of February and March.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04268" onclick="window.open(this.href); return false;" title="Voir l'image PIA04268: A Mid-Northern Summer/Southern Winter's Mars sur le site de la NASA">Voir l'image PIA04268: A Mid-Northern Summer/Southern Winter's Mars sur le site de la NASA.</a></div>
PIA04268: A Mid-Northern Summer/Southern Winter's Mars
<h1>PIA04272: Mars in Early Northern Spring</h1><div class="PIA04272" lang="en" style="width:686px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>In April 2003, the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) operations team completed the validation and archiving of MOC data acquired between February and July 2002. This was a period that included the end of northern winter and the start of spring in that hemisphere. This composite of MOC daily global images, acquired in early May 2002, shows what the planet looked like in early northern spring. The retreating north polar seasonal carbon dioxide frost cap is seen at the top of this view. Other white features in the image are clouds of water ice crystals in the martian atmosphere. The left half of this picture shows the Tharsis region, which includes several very large volcanoes. Olympus Mons, the largest martian volcano, is as wide as the Hawaiian Island chain is long; it is the dark, somewhat circular feature at the far left. Toward the lower right, the system of deep Valles Marineris chasms can be seen.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04272" onclick="window.open(this.href); return false;" title="Voir l'image PIA04272: Mars in Early Northern Spring sur le site de la NASA">Voir l'image PIA04272: Mars in Early Northern Spring sur le site de la NASA.</a></div>
PIA04272: Mars in Early Northern Spring
<h1>PIA04284: Mars at Ls 288°: Tharsis</h1><div class="PIA04284" lang="en" style="width:640px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>6 September 2005<br />This picture is a composite of Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) daily global images acquired at Ls 288° during a previous Mars year. This month, Mars looks similar, as Ls 288° occurs in mid-September 2005. The picture shows the Tharsis face of Mars. Over the course of the month, additional faces of Mars as it appears at this time of year are being posted for MOC Picture of the Day. Ls, solar longitude, is a measure of the time of year on Mars. Mars travels 360° around the Sun in 1 Mars year. The year begins at Ls 0°, the start of northern spring and southern autumn.<p>Season: Northern Winter/Southern Summer </p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04284" onclick="window.open(this.href); return false;" title="Voir l'image PIA04284: Mars at Ls 288°: Tharsis sur le site de la NASA">Voir l'image PIA04284: Mars at Ls 288°: Tharsis sur le site de la NASA.</a></div>
PIA04284: Mars at Ls 288°: Tharsis