Galerie de photos de la planète Terre

<h1>PIA09697: Rain Floods Central Texas</h1><div class="PIA09697" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA09697_fig1.jpg"></a><br />Figure 1</p><p>This image was taken on June 26, 2007, UTC 20:00. In this image an obvious storm hangs over the middle of the United States. Figure 1 shows CloudSat data looking, in profile, at the cloud in this storm. The vertical axis represents the altitude from the ground to the top of the atmosphere. The variations of color intensity are differences in reflectivity and an indication of the differing amounts of water and ice in the storm clouds. The bright line at the bottom of the panel is the ground return from the radar. This indicates that the radar penetrated to the ground most of the time, even through heavy rainfall. Where the ground return disappears is an indication that the radar was attenuated by heavy precipitation, likely exceeding 30 mm/hr, based on previous studies. From one side to the other, the bottom panel is approximately 800 km, and the vertical scale from top to bottom is approximately 30 km. The CloudSat data provide analysts and forecasters with a view of storms never before available. Cross-sections like these provide a view of the internal structure of these storms, giving information about the intensity, rainfall rates, and cloud organization.</p><p>Quicklook Images can viewed at the <a href="http://www.cloudsat.cira.colostate.edu/">CloudSat Data Processing Center</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA09697" onclick="window.open(this.href); return false;" title="Voir l'image PIA09697: Rain Floods Central Texas sur le site de la NASA">Voir l'image PIA09697: Rain Floods Central Texas sur le site de la NASA.</a></div>
PIA09697: Rain Floods Central Texas
<h1>PIA00076: Earth - full disk view of Africa</h1><div class="PIA00076" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">This color image of the Earth was obtained by the Galileo spacecraft on Dec. 11, 1990, when the spacecraft was about 1.5 million miles from the Earth. The color composite used images taken through the red, green and violet filters. Africa stretches from the center to the top of the picture with the Arabian Peninsula off to its right. The white, sunlit continent of Antarctica is at the bottom. This is a frame of the Galileo Earth spin movie, a 500-frame time-lapse motion picture showing a 25-hour period of Earth's rotation and atmospheric dynamics.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00076" onclick="window.open(this.href); return false;" title="Voir l'image PIA00076: Earth - full disk view of Africa sur le site de la NASA">Voir l'image PIA00076: Earth - full disk view of Africa sur le site de la NASA.</a></div>
PIA00076: Earth - full disk view of Africa
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<h1>PIA02441: Earth and Moon as viewed by Mariner 10</h1><div class="PIA02441" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Mariner 10 was launched on November 3, 1973, 12:45 am PST, from Cape Canaveral on an Atlas/Centaur rocket (a reconditioned Intercontinental Ballistic Missile - ICBM). Within 12 hours of launch the twin cameras were turned on and several hundred pictures of both the Earth and the Moon were acquired over the following days.<p>The Earth and Moon were imaged by Mariner 10 from 2.6 million km while completing the first ever Earth-Moon encounter by a spacecraft capable of returning high resolution digital color image data. These images have been combined at right to illustrate the relative sizes of the two bodies. From this particular viewpoint the Earth appears to be a water planet!<p>The Mariner 10 mission is managed by the Jet Propulsion Laboratory for NASA's Office of Space Science, explored Venus in February 1974 on the way to three encounters with Mercury-in March and September 1974 and in March 1975. The spacecraft took more than 7,000 photos of Mercury, Venus, the Earth and the Moon.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02441" onclick="window.open(this.href); return false;" title="Voir l'image PIA02441: Earth and Moon as viewed by Mariner 10 sur le site de la NASA">Voir l'image PIA02441: Earth and Moon as viewed by Mariner 10 sur le site de la NASA.</a></div>
PIA02441: Earth and Moon as viewed by Mariner 10
<h1>PIA00127: Earth - Northeast Africa and the Arabian Peninsula</h1><div class="PIA00127" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">This image of northeast Africa and the Arabian Peninsula was taken from an altitude of about 500,000 kilometers (300,000 miles) by the Galileo spacecraft on December 9, 1992, as it left Earth en route to Jupiter. Visible are most of Egypt (left of center), including the Nile Valley; the Red Sea (slightly above center); Israel; Jordan, and the Arabian Peninsula. In the center, below the coastal cloud, is Khartoum, at the confluence of the Blue Nile and the White Nile. Somalia (lower right) is partly covered by clouds.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00127" onclick="window.open(this.href); return false;" title="Voir l'image PIA00127: Earth - Northeast Africa and the Arabian Peninsula sur le site de la NASA">Voir l'image PIA00127: Earth - Northeast Africa and the Arabian Peninsula sur le site de la NASA.</a></div>
PIA00127: Earth - Northeast Africa and the Arabian Peninsula
<h1>PIA02458: SeaWinds - Oceans, Land, Polar Regions</h1><div class="PIA02458" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The SeaWinds scatterometer on the QuikScat satellite makes global radar measurements -- day and night, in clear sky and through clouds. The radar data over the oceans provide scientists and weather forecasters with information on surface wind speed and direction. Scientists also use the radar measurements directly to learn about changes in vegetation and ice extent over land and polar regions.<p>This false-color image is based entirely on SeaWinds measurements obtained over oceans, land, and polar regions. Over the ocean, colors indicate wind speed with orange as the fastest wind speeds and blue as the slowest. White streamlines indicate the wind direction. The ocean winds in this image were measured by SeaWinds on September 20, 1999. The large storm in the Atlantic off the coast of Florida is Hurricane Gert. Tropical storm Harvey is evident as a high wind region in the Gulf of Mexico, while farther west in the Pacific is tropical storm Hilary. An extensive storm is also present in the South Atlantic Ocean near Antarctica.<p>The land image was made from four days of SeaWinds data with the aid of a resolution enhancement algorithm developed by Dr. David Long at Brigham Young University. The lightest green areas correspond to the highest radar backscatter. Note the bright Amazon and Congo rainforests compared to the dark Sahara desert. The Amazon River is visible as a dark line running horizontally though the bright South American rain forest. Cities appear as bright spots on the images, especially in the U.S. and Europe.<p>The image of Greenland and the north polar ice cap was generated from data acquired by SeaWinds on a single day. In the polar region portion of the image, white corresponds to the largest radar return, while purple is the lowest. The variations in color in Greenland and the polar ice cap reveal information about the ice and snow conditions present.<p>NASA's Earth Science Enterprise is a long-term research and technology program designed to examine Earth's land, oceans, atmosphere, ice and life as a total integrated system. JPL is a division of the California Institute of Technology, Pasadena, CA.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02458" onclick="window.open(this.href); return false;" title="Voir l'image PIA02458: SeaWinds - Oceans, Land, Polar Regions sur le site de la NASA">Voir l'image PIA02458: SeaWinds - Oceans, Land, Polar Regions sur le site de la NASA.</a></div>
PIA02458: SeaWinds - Oceans, Land, Polar Regions
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<h1>PIA10120: Earth Departure Movie</h1><div class="PIA10120" lang="en" style="width:507px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/archive/PIA10120.mov"></a><a href="/archive/PIA10120_anno.mov"></a>Click on the image for<br />Earth Departure Movie<br />(4.90 MB) Click on the image for<br />Earth Departure Movie<br />with date and time<br />(5.78 MB)</p><p>The Mercury-bound MESSENGER spacecraft captured several stunning images of Earth during a gravity assist swingby of its home planet on Aug. 2, 2005. Several hundred images, taken with the wide-angle camera in MESSENGER's Mercury Dual Imaging System (MDIS), were sequenced into a movie documenting the view from MESSENGER as it departed Earth.</p><p>Comprising 358 frames taken over 24 hours, the movie follows Earth through one complete rotation. The spacecraft was 40,761 miles (65,598 kilometers) above South America when the camera started rolling on Aug. 2. It was 270,847 miles (435,885 kilometers) away from Earth—farther than the Moon's orbit—when it snapped the last image on Aug. 3.</p><p>These images are from MESSENGER, a NASA Discovery mission to conduct the first orbital study of the innermost planet, Mercury. For information regarding the use of images, see the MESSENGER <a href=" http://messenger.jhuapl.edu/the_mission/image_use.html" class="external free" target="wpext">image use policy</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10120" onclick="window.open(this.href); return false;" title="Voir l'image PIA10120: Earth Departure Movie sur le site de la NASA">Voir l'image PIA10120: Earth Departure Movie sur le site de la NASA.</a></div>
PIA10120: Earth Departure Movie
<h1>PIA11149: Map of Titan - February 2009</h1><div class="PIA11149" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This global digital map of Saturn's moon Titan was created using images taken by the Cassini spacecraft's imaging science subsystem.</p><p>The images were taken using a filter centered at 938 nanometers, allowing researchers to examine variations in albedo (or inherent brightness) across the surface of Titan. Because of the scattering of light by Titan's dense atmosphere, no topographic shading is visible in these images.</p><p>The map is an equidistant projection and has a scale of 4 kilometers (2.5 miles) per pixel. Actual resolution varies greatly across the map, with the best coverage (close to the map scale) near the center and edges of the map and the worst coverage on the leading hemisphere (centered around 120 degrees west longitude).</p><p>Imaging coverage in the northern polar region continues to improve as Titan approaches northern vernal equinox in August 2009 and the north pole comes out of shadow. Large dark areas, strongly suspected to be liquid-hydrocarbon-filled lakes, have been documented at high latitudes (see <a href="/catalog/PIA11146">PIA11146</a>).</p><p>The mean radius of Titan used for projection of this map is 2,575 kilometers (1,600 miles). Until a control network is created for Titan, the satellite is assumed to be spherical.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA11149" onclick="window.open(this.href); return false;" title="Voir l'image PIA11149: Map of Titan - February 2009 sur le site de la NASA">Voir l'image PIA11149: Map of Titan - February 2009 sur le site de la NASA.</a></div>
PIA11149: Map of Titan - February 2009
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<h1>PIA00114: Earth - South America (first frame of Earth Spin Movie)</h1><div class="PIA00114" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/archive/PIA00114.mov"></a><br><b>Click on the image for the animation</b></p><p></p>This color image of the Earth was obtained by Galileo at about 6:10 a.m. Pacific Standard Time on Dec. 11, 1990, when the spacecraft was about 1.3 million miles from the planet during the first of two Earth flybys on its way to Jupiter. The color composite used images taken through the red, green and violet filters. South America is near the center of the picture, and the white, sunlit continent of Antarctica is below. Picturesque weather fronts are visible in the South Atlantic, lower right. This is the first frame of the Galileo Earth spin movie, a 500- frame time-lapse motion picture showing a 25-hour period of Earth's rotation and atmospheric dynamics.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00114" onclick="window.open(this.href); return false;" title="Voir l'image PIA00114: Earth - South America (first frame of Earth Spin Movie) sur le site de la NASA">Voir l'image PIA00114: Earth - South America (first frame of Earth Spin Movie) sur le site de la NASA.</a></div>
PIA00114: Earth - South America (first frame of Earth Spin Movie)