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http://photojournal.jpl.nasa.gov/jp...5451_modest.jpg
PIA05451.tif (7.857 MB) http://photojournal.jpl.nasa.gov/tiff/PIA05451.tif

Citation: The rocky outcrop traversed by the Mars Exploration Rover Opportunity is visible in this three-dimensional model of the rover's landing site. Opportunity has acquired close-up images along the way, and scientists are using the rover's instruments to closely examine portions of interest. The white fragments that look crumpled near the center of the image are portions of the airbags. Distant scenery is displayed on a spherical backdrop or "billboard" for context. Artifacts near the top rim of the crater are a result of the transition between the three-dimensional model and the billboard. Portions of the terrain model lacking sufficient data appear as blank spaces or gaps, colored reddish-brown for better viewing. This image was generated using special software from NASA's Ames Research Center and a mosaic of images taken by the rover's panoramic camera.

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http://photojournal.jpl.nasa.gov/jp...5455_modest.jpg
PIA05455.tif (627.5 kB) http://photojournal.jpl.nasa.gov/tiff/PIA05455.tif

Citation: This microscopic image taken by the Mars Exploration Rover Spirit shows the tops or crests of the waves of windblown soil that characterize the surface of Gusev Crater, Mars. The coarse grains on the crests, combined with the finer grains observed in a similar microscopic image taken of the waves' troughs, indicate that the waves are geologic features known as ripples, and not dunes. Dunes contain a more uniform distribution of material. This information helps scientists better understand the winds that shape the landscape of Mars. The image was taken on the 41st martian day, or sol, of the rover's mission by its microscopic imager. The observed area is 3 centimeters (1.2 inches) across.

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http://photojournal.jpl.nasa.gov/jp...5454_modest.jpg
PIA05454.tif (627.5 kB) http://photojournal.jpl.nasa.gov/tiff/PIA05454.tif

Citation: This microscopic image taken by the Mars Exploration Rover Spirit shows the troughs between the waves of windblown soil that characterize the surface of Gusev Crater, Mars. The fine-grained soil in the troughs, combined with the coarse grains observed in a similar microscopic image taken of the waves' crests, indicate that the waves are geologic features known as ripples, and not dunes. Dunes contain a more uniform distribution of material. This information helps scientists better understand the winds that shape the landscape of Mars. The image was taken on the 41st martian day, or sol, of the rover's mission by its microscopic imager. The observed area is 3 centimeters (1.2 inches) across.

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http://photojournal.jpl.nasa.gov/jp...5456_modest.jpg
PIA05456.tif (787.5 kB) http://photojournal.jpl.nasa.gov/tiff/PIA05456.tif

Citation: This image from the Mars Exploration Rover Opportunity's panoramic camera shows a region of the rock outcrop at Meridiani Planum, Mars, dubbed "Charlie Flats." This region is a rich science target for Opportunity because it contains a diverse assortment of small grains, pebbles and spherules, as well as both dark and light soil deposits. The area seen here measures approximately 0.6 meters (2 feet) across. The smallest grains visible in this image are only a few millimeters in size. The approximate true color image was acquired on Sol 20 of Opportunity's mission with panoramic camera filters red, green and blue.

http://photojournal.jpl.nasa.gov/fi...05456_chart.jpg

Citation: Charlie Flats Spectra The chart above shows examples of spectra, or light wave patterns, extracted from the region of the Meridiani Planum rock outcrop dubbed "Charlie Flats," a rich science target for the Mars Exploration Rover Opportunity. The spectra were extracted from the similarly colored regions in the image on the left, taken by the rover's panoramic camera. The green circle identifies a bright, dust-like soil deposit. The red circle identifies a dark soil region. The yellow identifies a small, angular rock chip with a strong near-infrared band. The pink identifies a sphere-shaped pebble with a different strong near-infrared band. The cyan circle shows a dark, grayish pebble.

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http://photojournal.jpl.nasa.gov/jp...5457_modest.jpg
PIA05457.tif (6.988 MB) http://photojournal.jpl.nasa.gov/tiff/PIA05457.tif

Citation: This image from the Mars Exploration Rover Opportunity’s panoramic camera shows the "El Capitan" region of the rock outcrop at Meridiani Planum, Mars. On the bottom is the view obtained from the “Alpha” waypoint station on Sol 18 of Opportunity’s mission. On the top is the view obtained after the rover had moved to “Bravo” waypoint station on Sol 19. This image is a false-color composite using the red, green and blue filters.

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Solacin

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Toujours ces petites "billes" ..... et on sait toujours pas ce que c'est ?

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Citation: Message écrit par Solacin, le 27-02-2004 à 14:16 Toujours ces petites "billes" ..... et on sait toujours pas ce que c'est ?

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http://photojournal.jpl.nasa.gov/jp...5458_modest.jpg
PIA05458.tif (1.225 MB) http://photojournal.jpl.nasa.gov/tiff/PIA05458.tif

Citation: 27 February 2004 On some fine-grained martian slopes, rolling boulders make tracks. This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows an example of boulder tracks on a crater wall near 35.8°S, 158.5°W. Sunlight illuminates the scene from the upper right; the 150 m scale bar is also about 492 feet long.

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http://photojournal.jpl.nasa.gov/jp...5461_modest.jpg
PIA05461.tif (2.444 MB) http://photojournal.jpl.nasa.gov/tiff/PIA05461.tif

Citation: This graphic is a screenshot from a computer-generated visualization tool used by Mars Exploration Rover Opportunity scientists to find the rover's best position for observing a future target dubbed "Last Chance." Team members are determining how to obtain the optimal angle for photographing this layered rock, located on the far east end of the outcrop. The rover drivers must solve very complex geometry calculations to position the cameras at just the right distance from the rock with exactly the right illumination by the Sun. If the rover is parked to the west of the target, and the Sun is setting in the west when the rover is commanded to take the picture, the rover will cast a shadow on the prime location and important features in the image will be lost in the dark. The planning of this particular photo of "Last Chance" is particularly complex because the uneven terrain underneath the rover will cause the camera angle to tilt. All six rover wheels will be sitting on varied levels of rock and soil, creating a more difficult camera-aiming challenge. The rock area itself is at a right angle, which further complicates matters because the science team plans to take pictures from two sides of the rock to better understand how this rock formed. The number of pictures the science team plans to take of this site adds yet another layer of necessary forethought: the flash memory must be empty enough to record and store the large images before transmitting the data back to Earth. Three sols in advance of taking the pictures, the longterm planning team is asking the science team to conserve data volume to allow for an onslaught of new panoramic camera images scheduled for sol 36. This visualization software was created by the rover visualization team from NASA Ames Research Center, Moffett Field, Calif. Its terrain models are built from images taken by the rover's panoramic camera on the surface of Mars. The rover model, based on animations and drawings designed by Dan Maas at Maas Digital LLC, contains precise dimensions of the rover's mast and camera locations in relation to its entire body and wheels to an accuracy of centimeters.

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http://photojournal.jpl.nasa.gov/jp...5460_modest.jpg
PIA05460.tif (39.26 MB) http://photojournal.jpl.nasa.gov/tiff/PIA05460.tif

Citation: This image taken by the panoramic camera onboard the Mars Exploration Rover Opportunity shows the rover's now-empty lander, the Challenger Memorial Station, at Meridiani Planum, Mars. The image was acquired on the 24th martian day, or sol, of Opportunity's mission at approximately 13:00 Local Solar Time. This is a mosaic image consisting of 12 color images acquired with the camera's red, green and blue filters. The color balance has been set to approximate the colors that a human eye would see.

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http://photojournal.jpl.nasa.gov/jp...5466_modest.jpg
PIA05466.tif (360.6 kB) http://photojournal.jpl.nasa.gov/tiff/PIA05466.tif

Citation: This image of the rock called "Humphrey" was taken by the navigational camera on the Mars Exploration Rover Spirit during its 54th sol on Mars. The rock's name was inspired by Humphries Peak - the tallest peak in Arizona and part of the San Francisco volcanic complex. Standing approximately .6 meters (about 2 feet) tall, "Humphrey" is one of the largest blocks of what scientists believe is ejected material from one of the rover's long-term targets, the crater dubbed "Bonneville." Likely a basaltic rock, the fractures in "Humphrey" are thought to have been caused by the impact as it was hurled from the crater to its current resting place. Scientists are eager to investigate ejecta rocks, as they give a glimpse of the composition of materials that lie beneath the martian surface. Spirit's engineering and science teams are preparing to brush and then grind "Humphrey" with Spirit's rock abrasion tool. The hope is to remove as much dust as possible so they can examine the coating before grinding, and then study the exposed undersurface after grinding with the cameras and the miniature thermal emission spectrometer.

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Solacin

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Humphrey, prochaine cible pour Opportunity

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a 14h (2pm) NASA time, ils annonceront quelque chose de "BIG".....
Mais je serai dans mon lit

Quelque peut poster la news ici?

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http://photojournal.jpl.nasa.gov/jp...5467_modest.jpg

Citation: These plots, or spectra, show that a rock dubbed "McKittrick" near the Mars Exploration Rover Opportunity's landing site at Meridiani Planum, Mars, has higher concentrations of sulfur and bromine than a nearby patch of soil nicknamed "Tarmac." These data were taken by Opportunity's alpha particle X-ray spectrometer, which uses curium-244 to assess the elemental composition of rocks and soil. Only portions of the targets' full spectra are shown to highlight the significant differences in elemental concentrations between "McKittrick" and "Tarmac." Intensities are plotted on a logarithmic scale. A nearby rock named Guadalupe similarly has extremely high concentrations of sulfur, but very little bromine. This "element fractionation" typically occurs when a watery brine slowly evaporates and various salt compounds are precipitated in sequence.

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http://photojournal.jpl.nasa.gov/jp...5468_modest.jpg

Citation: These plots, or spectra, show that a rock dubbed "McKittrick" near the Mars Exploration Rover Opportunity's landing site at Meridiani Planum, Mars, possesses the highest concentration of sulfur yet observed on Mars. These data were acquired with the rover's alpha particle X-ray spectrometer, which produces a spectrum, or fingerprint, of chemicals in martian rocks and soil. This instrument contains a radioisotope, curium-244, that bombards a designated area with alpha particles and X-rays, causing a cascade of reflective fluorescent X-rays. The energies of these fluorescent X-rays are unique to each atom in the periodic table, allowing scientists to determine a target's elemental composition. The spectra shown here are taken from "McKittrick" and a soil patch nicknamed "Tarmac," both of which are located within the small crater where Opportunity landed. "McKittrick" measurements were acquired after the rover drilled a hole in the rock with its rock abrasion tool. Only portions of the targets' full spectra are displayed. The data are expressed as X-ray intensity (linear scale) versus energy. The measured area is 28 millimeters (1 inch) in diameter. When comparing two spectra, the relative intensities at a given energy are proportional to the elemental concentrations, however these proportionality factors can be complex. To be precise, scientists extensively calibrate the instrument using well-analyzed geochemical standards. Both the alpha particle X-ray spectrometer and the rock abrasion tool are located on the rover's instrument deployment device, or arm.

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