Mission Mars Odyssey - 2

<h1>PIA04029: Rampart Crater</h1><div class="PIA04029" lang="en" style="width:452px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04029_context.jpg"></a><br><p>Rampart crater in Utopia Planitia west of the Viking 2 landing site.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04029" onclick="window.open(this.href); return false;" title="Voir l'image PIA04029: Rampart Crater sur le site de la NASA">Voir l'image PIA04029: Rampart Crater sur le site de la NASA.</a></div>
PIA04029: Rampart Crater
<h1>PIA04030: Crater in Cydonia</h1><div class="PIA04030" lang="en" style="width:506px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04030_context.jpg"></a><br><p>This image shows the dissected interior of a crater in the Cydonia region of Mars. The flat-topped buttes and mesas in the northern portion of the image were once a continuous layer of material that filled the crater. Since deposition, the material has been disturbed and dissected. The process that causes such landforms is not well known, but likely involves frozen subsurface water that may have found its way to the surface. The surfaces on the mesas are not rough, suggesting that the whole scene is mantled with fine dust, masking the details that may give clues to whether surface water was involved at some point in the past. Small recent channels can be seen in the lower left. This is an indication of relatively recent small-scale surface activity, which has been could have been volcanic, fluvial, or some process involving subsurface volatiles (ice).<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04030" onclick="window.open(this.href); return false;" title="Voir l'image PIA04030: Crater in Cydonia sur le site de la NASA">Voir l'image PIA04030: Crater in Cydonia sur le site de la NASA.</a></div>
PIA04030: Crater in Cydonia
<h1>PIA04031: Reull Vallis</h1><div class="PIA04031" lang="en" style="width:456px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04031_context.jpg"></a><br><p>The channels and impact crater rim shown in this THEMIS image provide insight to the forces that have sculpted the surface within the extensive Reull Vallis network. Drainage features and dissected materials observed around and within the impact crater wall demonstrate the erosional and depositional effects of possible fluvial processes. A portion of a possible landslide is also observed within the crater as lobes of material emanate from the crater wall. Reull Vallis is a large and morphologically diverse outflow channel system, and this small view from within demonstrates the combination of mass movement processes that have persisted over an extended time period.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04031" onclick="window.open(this.href); return false;" title="Voir l'image PIA04031: Reull Vallis sur le site de la NASA">Voir l'image PIA04031: Reull Vallis sur le site de la NASA.</a></div>
PIA04031: Reull Vallis
<h1>PIA04032: Palos Crater</h1><div class="PIA04032" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04032_context.jpg"></a><br><p>Palos Crater has been suggested as a future landing site for Mars Missions. This crater has a channel called Tinto Vallis, which enters from the south. This site was suggested as a landing site because it may contain lake deposits. Palos Crater is named in honor of the port city in Spain from which Christopher Columbus sailed on his way to the New World in August of 1492. The floor of Palos Crater appears to be layered in places providing further evidence that this site may in fact have been the location of an ancient lake.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04032" onclick="window.open(this.href); return false;" title="Voir l'image PIA04032: Palos Crater sur le site de la NASA">Voir l'image PIA04032: Palos Crater sur le site de la NASA.</a></div>
PIA04032: Palos Crater
<h1>PIA04033: Geological Time on Display in Arabia Terra</h1><div class="PIA04033" lang="en" style="width:490px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04033_context.jpg"></a><br><p>This scene from the dust covered plains of eastern Arabia Terra portrays a range of geological time. Three craters at the center of the image capture some of this range. Two have the classic bowl-shape of small, relatively recent craters while the one just to the north has seen much more history. Its rim has been scoured away by erosion and its floor has been filled in by material likely of a sedimentary nature. The channels that wind through the scene may be the oldest features present while the relatively dark streaks scattered about could have been produced in the past few years or even months as winds remove a layer of dust to reveal darker material below.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04033" onclick="window.open(this.href); return false;" title="Voir l'image PIA04033: Geological Time on Display in Arabia Terra sur le site de la NASA">Voir l'image PIA04033: Geological Time on Display in Arabia Terra sur le site de la NASA.</a></div>
PIA04033: Geological Time on Display in Arabia Terra
<h1>PIA04034: Western Portion of Acheron Fossae</h1><div class="PIA04034" lang="en" style="width:474px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04034_context.jpg"></a><br><p>Located north of Olympus Mons and west of Alba Patera, Acheron Fossae provides a record of early tectonic activity in the Tharsis region. Acheron Fossae is a relatively high standing region characterized by multiple subparallel graben. As seen in the image, the graben trend generally to the northwest. The entire area predates the Alba Patera flows (which embay the eastern most Acheron grabens) and the Olympus Mons volcano (one of the youngest Tharsis features). The subdued nature of the highstanding hills, the erosion the graben walls, the eroded rims of all the visible craters, and the wind etching of the flat surfaces all help indicate the great age of Acheron Fossae.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04034" onclick="window.open(this.href); return false;" title="Voir l'image PIA04034: Western Portion of Acheron Fossae sur le site de la NASA">Voir l'image PIA04034: Western Portion of Acheron Fossae sur le site de la NASA.</a></div>
PIA04034: Western Portion of Acheron Fossae
<h1>PIA04036: Yardangs near Olympus Mons</h1><div class="PIA04036" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04036_context.jpg"></a><br><p>In this region of the Olympus Mons aureole, located to the SW of the volcano, the surface has been eroded by the wind into linear landforms called yardangs. These ridges generally point in direction of the prevailing winds that carved them, in this case winds from the southeast. Yardangs typically occur on surfaces that are easily erodable, such as wind-blown dust or volcanic ash. The northeast - southwest trending ridges and valleys in the northwest corner of the image are typical of the Olympus Mons aureole. The varying concentration and shape of the yardangs in this area may be controlled by the motion of winds around these topographic features.<p>Some crater outlines are visible near the top of this image. The rims of these craters appear to have been stripped away - indicating that the wind erosion is younger than these craters. There are two round knobs in the image, one on the bottom on the right side of the image and another about midway down on the left. These may be inverted craters, formed because the impacts caused materials underneath the crater to become harder to erode than the surrounding materials.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04036" onclick="window.open(this.href); return false;" title="Voir l'image PIA04036: Yardangs near Olympus Mons sur le site de la NASA">Voir l'image PIA04036: Yardangs near Olympus Mons sur le site de la NASA.</a></div>
PIA04036: Yardangs near Olympus Mons
<h1>PIA04037: Granicus Valles</h1><div class="PIA04037" lang="en" style="width:513px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04037_context.jpg"></a><br><p>The force of moving water from a flood carved these teardrop-shaped islands within Granicus Valles. The orientation of the islands can be used as an indicator of the direction the water flowed. In this case, the water flowed primarily towards the upper left of the image. The image also contains many narrow sinuous channels. Geologists can determine that the floods occurred before a later tectonic event in the region. This event caused the crust to fracture into numerous blocks and fissures (grabens). Many fissures can be seen cutting across the former flood pathways.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04037" onclick="window.open(this.href); return false;" title="Voir l'image PIA04037: Granicus Valles sur le site de la NASA">Voir l'image PIA04037: Granicus Valles sur le site de la NASA.</a></div>
PIA04037: Granicus Valles
<h1>PIA04038: Arcadia Planitia Dark Splotch</h1><div class="PIA04038" lang="en" style="width:473px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04038_context.jpg"></a><br><p>Arcadia Planitia occupies a region just north of Amazonis Planitia, one of the brightest and dustiest regions on Mars. Along the boundary between these two regions is a dark splotch roughly 600 km long that is relatively free of dust. This THEMIS image straddles the border of the dark splotch, producing the dramatic change in brightness from north to south. Note that many of the small craters in the dark portion of the image contain bright material on their floor. It may be that a mantle of dust has been stripped back revealing the dark surface of the splotch but the crater floors have retained the dust. Alternatively, the bright material may represent a more resistant unit that once covered the area and is difficult to erode from the crater floors. Either way, the presence of the bright material in so many craters produces a scene that is quite unusual for the surface of Mars.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04038" onclick="window.open(this.href); return false;" title="Voir l'image PIA04038: Arcadia Planitia Dark Splotch sur le site de la NASA">Voir l'image PIA04038: Arcadia Planitia Dark Splotch sur le site de la NASA.</a></div>
PIA04038: Arcadia Planitia Dark Splotch
<h1>PIA04039: Lava Flows around Olympus Mons</h1><div class="PIA04039" lang="en" style="width:480px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04039_context.jpg"></a><br><p>At first glance, this image of lava flows around the large scarp of Olympus Mons shows little contrast in surface materials due to dust cover, but a closer look reveals textures characteristic of the variable surface roughness associated with different lava flows in this region. The lobate edges of the flows are distinctive, and permit the discrimination of many overlapping individual flows. On small scales, the surfaces of some flows look wrinkly and ropy, indicating a relatively fluid type of lava flow referred to as pahoehoe. Other surfaces appear more rough and broken, and might be referred to as a'a flows, which have higher viscosities and effusion rates compared to pahoehoe flows. The surface textures of lava flows can thus sometimes be used for comparative purposes to infer lava viscosity and effusion rates. There is also a bright streak in the wind shadow of the impact crater in the lower left of the image where dust that settles onto the surface is not easily scoured away.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04039" onclick="window.open(this.href); return false;" title="Voir l'image PIA04039: Lava Flows around Olympus Mons sur le site de la NASA">Voir l'image PIA04039: Lava Flows around Olympus Mons sur le site de la NASA.</a></div>
PIA04039: Lava Flows around Olympus Mons
<h1>PIA04040: Semeykin Crater</h1><div class="PIA04040" lang="en" style="width:501px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04040_context.jpg"></a><br><p>This is an image within Semeykin Crater, which is located in the Martian northern hemisphere. This location is at the edge of the planetary dichotomy, a boundary between the heavily cratered and older southern highlands and the lightly cratered northern lowlands. This boundary is marked by remnants, or "islands," of highland terrain standing out within the northern lowlands. It is uncertain how this dichotomy formed, but the interior of this crater has been resurfaced with the smoother, younger terrain. Much of the older remnants appear softened. This may be due to past or present subsurface ice that can deform the terrain. Dark sand is also visible in the right hand side of the image.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04040" onclick="window.open(this.href); return false;" title="Voir l'image PIA04040: Semeykin Crater sur le site de la NASA">Voir l'image PIA04040: Semeykin Crater sur le site de la NASA.</a></div>
PIA04040: Semeykin Crater
<h1>PIA04041: Acidalia Planitia</h1><div class="PIA04041" lang="en" style="width:493px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04041_context.jpg"></a><br><p>Much of the northern lowlands of Mars are thought to be relatively young volcanic flows with varying amounts of windblown dust cover. The lack of impact craters in this image indicate the young age of the surface. The lighter spots in the top portion of the image are likely small volcanic features, either small cones or perhaps small collapse pits. The appearance of the darker material abutting or flowing against the higher knobs and ridges is common in volcanic flow fields.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04041" onclick="window.open(this.href); return false;" title="Voir l'image PIA04041: Acidalia Planitia sur le site de la NASA">Voir l'image PIA04041: Acidalia Planitia sur le site de la NASA.</a></div>
PIA04041: Acidalia Planitia
<h1>PIA04042: "Bread Loaf" Mesa East of Phlegra Montes</h1><div class="PIA04042" lang="en" style="width:469px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04042_context.jpg"></a><br><p>An isolated mesa east of the Phlegra Montes in northeastern Elysium Planitia has a cracked surface that, combined with its overall shape, gives the appearance of a giant loaf of bread. Other mesas with similar surfaces are found in the area, suggesting that at one time these mesas were part of a continuous layer of material. It is likely that at that time, some process caused the graben-like cracks to form. Later erosion of the cracked layer left only the isolated mesas seen in the THEMIS image. One clue that supports this scenario is the presence of many filled and eroded craters throughout the scene but no fresh ones. One way to produce this landscape begins with an ancient and heavily cratered surface that subsequently is buried by some other material. If this overburden was stripped off relatively recently, not enough time would have passed to allow for a new population of fresh craters to be produced. The result would be a landscape with isolated mesas of younger material on top of an ancient, cratered surface.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04042" onclick="window.open(this.href); return false;" title="Voir l'image PIA04042: "Bread Loaf" Mesa East of Phlegra Montes sur le site de la NASA">Voir l'image PIA04042: "Bread Loaf" Mesa East of Phlegra Montes sur le site de la NASA.</a></div>
PIA04042: "Bread Loaf" Mesa East of Phlegra Montes
<h1>PIA04043: Tithonium Chasma</h1><div class="PIA04043" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04043_context.jpg"></a><br><p>This image covers part of Tithonium Chasma, which is part of the Valles Marineris system of canyons that stretch for thousands of kilometers. The contrast between dark sandy surfaces covered by dunes and bright dusty surfaces with a rather uniform appearance is clearly visible in the bottom half of the image. Small cut channels and flat-topped buttes, representing an erosional remnant of a resistant layer of rock, are also observed and covered by dust. In the top half of the image, ridgelines are observed in the canyon walls with small dark streaks trailing downslope; these streaks suggest that the sediments covering this area occasionally become unstable and slide.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04043" onclick="window.open(this.href); return false;" title="Voir l'image PIA04043: Tithonium Chasma sur le site de la NASA">Voir l'image PIA04043: Tithonium Chasma sur le site de la NASA.</a></div>
PIA04043: Tithonium Chasma
<h1>PIA04044: Floor of Hellas Basin</h1><div class="PIA04044" lang="en" style="width:482px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04044_context.jpg"></a><br><p>With a diameter of roughly 2000 km and a depth of over 7 km, the Hellas Basin is the largest impact feature on Mars. Because of its great depth, there is significantly more atmosphere to peer through in order to see its floor, reducing the quality of the images taken from orbit. This THEMIS image straddles a scarp between the Hellas floor and an accumulation of material at least a half kilometer thick that covers much of the floor. The southern half of the image contains some of this material. Strange ovoid landforms are present here that give the appearance of flow. It is possible that water ice or even liquid water was present in the deposits and somehow responsible for the observed landscape. The floor of Hellas remains a poorly understood portion of the planet that should benefit from the analysis of new THEMIS data.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04044" onclick="window.open(this.href); return false;" title="Voir l'image PIA04044: Floor of Hellas Basin sur le site de la NASA">Voir l'image PIA04044: Floor of Hellas Basin sur le site de la NASA.</a></div>
PIA04044: Floor of Hellas Basin
<h1>PIA04045: Late Afternoon Sun</h1><div class="PIA04045" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04045_context.jpg"></a><br><p>This image of the northern plains of Mars shows a surface texture of hundreds of small mounds and numerous small impact craters. The THEMIS imaging team is taking advantage of the late afternoon sun illumination to image places like this where the surface may contain small scale features that are "washed-out" by higher illumination angles. As the sun dips towards the horizon (to the left side of the image), shadows are cast. The length of the shadows can be used to estimate the height of the feature casting them - or the depth of the crater that contains the shadow. In this image the craters - even very small ones - are now partially filled by shadow making it very easy to identify them. The small bumps are not casting shadows yet, but are easily seen. These small bumps were not easily identified when the sun angle was higher (earlier in the afternoon). As this image shows, late afternoon sun illumination is wonderful for making small scale morphologic features visible.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04045" onclick="window.open(this.href); return false;" title="Voir l'image PIA04045: Late Afternoon Sun sur le site de la NASA">Voir l'image PIA04045: Late Afternoon Sun sur le site de la NASA.</a></div>
PIA04045: Late Afternoon Sun
<h1>PIA04046: Tempe Terra</h1><div class="PIA04046" lang="en" style="width:499px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04046_context.jpg"></a><br><p>This image is from a region of Mars called Tempe Terra, which is located between the topographically high Tharsis Region and Acidalia Planitia, a large low albedo region of in the Martian northern hemisphere. This image displays a number of interesting features. There are several channels that run through the image. It is unclear if there was once lava or water running through these channels. Much of the terrain in the image appears dissected and eroded. There are a number of circular features that resemble the remnants of older craters that were mostly eroded away. The variety of the conditions of the craters indicates that this surface has been modified over a long time period. There is also a fine texture to many surfaces. This texture could also be possibly volcanic or related to ground ice.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04046" onclick="window.open(this.href); return false;" title="Voir l'image PIA04046: Tempe Terra sur le site de la NASA">Voir l'image PIA04046: Tempe Terra sur le site de la NASA.</a></div>
PIA04046: Tempe Terra
<h1>PIA04047: Terra Sirenum</h1><div class="PIA04047" lang="en" style="width:456px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04047_context.jpg"></a><br><p>This image is from a region called Terra Sirenum in Mars' southern hemisphere. This region was named in 1958 for the Sea of the Sirens from Greek Mythology. This is not a sea, however, but a relatively dusty, high albedo region of Mars. There are numerous dust devil tracks that are apparent in the center- left of the image. The dust devils act like vacuum cleaners and lift dust off of the surface leaving a less dusty and relatively lower albedo surface behind. Dust devils are very common on Mars and are thought to be the primary mechanism for constantly lifting the dust into the atmosphere. Dust is constantly present in the Martian atmosphere in greater abundances than typically seen on Earth. The Martian dust is one of the main factors that affect the present Martian climate and clearly displays the relationship between Mars' geology and atmosphere.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04047" onclick="window.open(this.href); return false;" title="Voir l'image PIA04047: Terra Sirenum sur le site de la NASA">Voir l'image PIA04047: Terra Sirenum sur le site de la NASA.</a></div>
PIA04047: Terra Sirenum
<h1>PIA04048: Terra Cimmeria Highlands</h1><div class="PIA04048" lang="en" style="width:461px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04048_context.jpg"></a><br><p>This image shows the cratered highlands of Terra Cimmeria. The image contains several long troughs of Sirenum Fossae running primarily from left to right. These features are parallel to semi-parallel fractures called graben. In places the fractures postdate crater formation. This is best seen where fractures cut across the ejecta blanket of the large crater near the right center of the image.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04048" onclick="window.open(this.href); return false;" title="Voir l'image PIA04048: Terra Cimmeria Highlands sur le site de la NASA">Voir l'image PIA04048: Terra Cimmeria Highlands sur le site de la NASA.</a></div>
PIA04048: Terra Cimmeria Highlands
<h1>PIA04049: Impact Crater</h1><div class="PIA04049" lang="en" style="width:462px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04049_context.jpg"></a><br><p>Today marks the 45th anniversary of the dawn of the Space Age (October 4, 1957). On this date the former Soviet Union launched the world's first satellite, Sputnik 1. Sputnik means fellow traveler. For comparison Sputnik 1 weighed only 83.6 kg (184 pounds) while Mars Odyssey weighs in at 758 kg (1,671 pounds).<p>This scene shows several interesting geologic features associated with impact craters on Mars. The continuous lobes of material that make up the ejecta blanket of the large impact crater are evidence that the crater ejecta were fluidized upon impact of the meteor that formed the crater. Volatiles within the surface mixed with the ejecta upon impact thus creating the fluidized form. Several smaller impact craters are also observed within the ejecta blanket of the larger impact crater giving a relative timing of events. Layering of geologic units is also observed within the large impact crater walls and floor and may represent different compositional units that erode at variable rates. Cliff faces, dissected gullies, and heavily eroded impact craters are observed in the bottom half of the image at the terminus of a flat-topped plateau.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04049" onclick="window.open(this.href); return false;" title="Voir l'image PIA04049: Impact Crater sur le site de la NASA">Voir l'image PIA04049: Impact Crater sur le site de la NASA.</a></div>
PIA04049: Impact Crater
<h1>PIA04054: Bumpy Terrain</h1><div class="PIA04054" lang="en" style="width:450px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04054_context.jpg"></a><br><p>Hills abound in this portion of Mars located in the Vastitas Borealis region of the high northern plains. These hills are part of Scandia Colles. Note that some of the hills have aprons surrounding them. The northern part of Milankovic crater is visible in the lower portion of this image.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04054" onclick="window.open(this.href); return false;" title="Voir l'image PIA04054: Bumpy Terrain sur le site de la NASA">Voir l'image PIA04054: Bumpy Terrain sur le site de la NASA.</a></div>
PIA04054: Bumpy Terrain
<h1>PIA04055: Winter in Hellas Basin</h1><div class="PIA04055" lang="en" style="width:463px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04055_context.jpg"></a><br><p>Right now on Mars it is winter in the southern hemisphere. This means that the usually cloudy Hellas Basin is relatively free from clouds. Even though there is little cloud cover, the atmosphere is still much thicker due to the deeper basin compared to elsewhere on Mars, making image details not as crisp as when viewed through thinner atmosphere. In the center of the image are several dark streaks which originate from the side of a higher standing butte. The dark material is likely being eroded from a single layer within the cliff face. Wind has moved some of the eroded dark material to form the streaks.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04055" onclick="window.open(this.href); return false;" title="Voir l'image PIA04055: Winter in Hellas Basin sur le site de la NASA">Voir l'image PIA04055: Winter in Hellas Basin sur le site de la NASA.</a></div>
PIA04055: Winter in Hellas Basin
<h1>PIA04056: Western Arabia Terra</h1><div class="PIA04056" lang="en" style="width:499px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04056_context.jpg"></a><br><p>Today's THEMIS image covers a region in western Arabia Terra, which contains two interesting craters. The eastern floor of the largest crater seen in most of this image is bumpy and ridged in places and relatively smooth in regions. Careful examination shows that this crater floor contains layered material. This is best seen in the lower portion of this crater. The larger of the two craters located to the lower right also contains layered materials.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04056" onclick="window.open(this.href); return false;" title="Voir l'image PIA04056: Western Arabia Terra sur le site de la NASA">Voir l'image PIA04056: Western Arabia Terra sur le site de la NASA.</a></div>
PIA04056: Western Arabia Terra
<h1>PIA04057: Cydonia Landscape</h1><div class="PIA04057" lang="en" style="width:498px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04057_context.jpg"></a><br><p>The Cydonia region on Mars straddles the boundary between the bright, dusty, cratered highlands to the southeast and the dark, relatively dust-free, lowland plains to the west. The countless mesas and buttes that cover the region are testament to the former presence of vast layers of material that have been stripped back over the eons leaving the isolated remnants seen in this THEMIS image. Evidence of larger masses of these remnants is visible to the south in the MOLA context image. Note the lobes of ejecta emanating from the large crater in the upper right of the THEMIS image. This style of ejecta is thought to arise when an impact occurs into water or ice-rich material, indicating that at least at the time of the impact such material was present.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04057" onclick="window.open(this.href); return false;" title="Voir l'image PIA04057: Cydonia Landscape sur le site de la NASA">Voir l'image PIA04057: Cydonia Landscape sur le site de la NASA.</a></div>
PIA04057: Cydonia Landscape
<h1>PIA04058: Henry Crater</h1><div class="PIA04058" lang="en" style="width:489px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04058_context.jpg"></a><br><p>Located in Arabia Terra, the crater shown here is known as Henry Crater. Like many other craters on Mars, the interior of Henry Crater is filled with a layered deposit. These materials were brought into the crater sometime after the impact formed the crater. The fine scale of layering can be seen in the right- center portion of the image.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04058" onclick="window.open(this.href); return false;" title="Voir l'image PIA04058: Henry Crater sur le site de la NASA">Voir l'image PIA04058: Henry Crater sur le site de la NASA.</a></div>
PIA04058: Henry Crater
<h1>PIA04059: Arcadia Planitia</h1><div class="PIA04059" lang="en" style="width:471px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04059_context.jpg"></a><br><p>This THEMIS image of rounded hills and ridges in Arcadia Planitia shows a very intriguing geomorphic feature that may be attributed to the presence of an icy-rock mixture of material. Smooth aprons of material are observed to be preferentially located on the cold, north facing slopes of hills and extend further and beyond the deposits located on other sides. These smooth deposits are in stark contrast to the more rough surfaces that dominate the scene and it has been suggested that they represent a preserved mixture of ice and rock. How exactly this deposit forms still remains a mystery. They may have been ?pasted? onto the slopes and preserved on the cold facing sides or they may represent the result of downslope motion of material that is enhanced by the presence of ground ice. In either case, this interesting observation suggests that ground ice may still play an important role in the formation and preservation of martian surface features.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04059" onclick="window.open(this.href); return false;" title="Voir l'image PIA04059: Arcadia Planitia sur le site de la NASA">Voir l'image PIA04059: Arcadia Planitia sur le site de la NASA.</a></div>
PIA04059: Arcadia Planitia
<h1>PIA04060: Hesperia Planum</h1><div class="PIA04060" lang="en" style="width:485px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04060_context.jpg"></a><br><p>This image is located in the eastern portion of a region on Mars called Hesperia Planum, which is in the cratered southern highlands of Mars. Immediately visible in the image is the dark barchan type dunes that are being blown against the southeast wall of the crater. The position of the dunes in the crater as well as the southeast facing slipfaces on the dunes indicate that the local winds blow primarily towards the southeast. An interesting aspect of this image is the relatively brighter ripple like features that are visible just to the southeast of the dune field. These features are smaller than the dark dunes, but can be clearly seen in the full resolution image. Wind processes also probably formed these features and their orientation also indicates a northwest-southeast wind direction. It is not clear if these features are actively being formed by the wind or if they were only active at some point in the Martian past. Mars is a very dry, desert-like environment and the wind plays a very important role in shaping the present landscape.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04060" onclick="window.open(this.href); return false;" title="Voir l'image PIA04060: Hesperia Planum sur le site de la NASA">Voir l'image PIA04060: Hesperia Planum sur le site de la NASA.</a></div>
PIA04060: Hesperia Planum
<h1>PIA04061: Appollinaris Patera</h1><div class="PIA04061" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04061_context.jpg"></a><br><p>This THEMIS image shows parts of the dissected and eroded remnants of an impact crater rim and volcanic material located north of Apollinaris Patera near the southern highlands - northern lowlands dichotomy on Mars. The rugged terrain observed in the context image of the region has been interpreted as lava flows interbedded with eolian or volcanic pyroclastics while the more smooth terrain has been interpreted as ancient channel deposits. The high resolution THEMIS image shows the effects of erosion on these materials as parts of the rim have been dissected into a chaotic terrain. Smaller and heavily eroded impact craters are also observed in the image and are evidence of the powerful effects of erosion.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04061" onclick="window.open(this.href); return false;" title="Voir l'image PIA04061: Appollinaris Patera sur le site de la NASA">Voir l'image PIA04061: Appollinaris Patera sur le site de la NASA.</a></div>
PIA04061: Appollinaris Patera
<h1>PIA04062: Arabia Terra</h1><div class="PIA04062" lang="en" style="width:490px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04062_context.jpg"></a><br><p>This image shows deposits in a crater located in Arabia Terra. Arabia is generally dust covered and dark streaks or dust avalanches are present in the crater walls. The dominant geologic process acting in this crater interior is wind erosion. The central crater deposits are eroded to form yardangs, or linear wind-sculpted hills that resemble an inverted boat hull. Deflation and abrasion are capable of eroding rock structures that are aligned parallel to wind direction. In the lower right hand side of the crater, a dark deposit has formed barchan dunes. These crescent shaped dunes have "horns" that point downwind indicating general northwest to southeast wind direction. These dark sands probably played a role in the erosion and formation of the yardangs.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04062" onclick="window.open(this.href); return false;" title="Voir l'image PIA04062: Arabia Terra sur le site de la NASA">Voir l'image PIA04062: Arabia Terra sur le site de la NASA.</a></div>
PIA04062: Arabia Terra
<h1>PIA04063: Olympus Mons Flows</h1><div class="PIA04063" lang="en" style="width:489px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04063_context.jpg"></a><br><p>Like drippings from a candle, these lava flows on the flank of Olympus Mons volcano demonstrate how it became the largest volcano in the solar system. Multiple flows from an unknowable number of eruptions have piled one on top of another until the mountain of lava reached a height of 27 km above the average Martian elevation. The change in texture seen in the bottom 1/3 of the image marks a break in slope from the flank of the volcano to the north (top) and the flat plain surrounding it. The direction of flows changes from roughly N-S to E-W, suggesting another source for the flows on the plain.<p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.<p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04063" onclick="window.open(this.href); return false;" title="Voir l'image PIA04063: Olympus Mons Flows sur le site de la NASA">Voir l'image PIA04063: Olympus Mons Flows sur le site de la NASA.</a></div>
PIA04063: Olympus Mons Flows

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