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Emi Koussi Volcano, Chad, North Africa
Published December 8, 2002
Emi Koussi is a high volcano that lies at the south end of the Tibesti Mountains in the central Sahara in northern Chad. The volcano is one of several in the Tibesti massif, and reaches 3415 m in altitude, rising 2.3 kilometers above the surrounding sandstone plains. The volcano is 65 kilometers wide. This view of the Emi Koussi caldera is detailed to the point that it doesn’t include the entire 10-kilometer diameter of the caldera, but reveals individual lava strata within the walls of the summit cliffs. Nested within the main caldera is a smaller crater that contains white salts of a dry lake at its lowest point. Here too, strata are visible in the walls of the smaller crater. The smaller crater is surrounded by a region of darker rocks—a geologically young dome of lava studded with several small circular volcanic vents.
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Mining and Agriculture in Kazakhstan
Published November 24, 2002
Agricultural activities and mining occur side-by-side in the Republic of Kazakhstan. This scene is located in the Turgayskaya Oblast of central Kazakhstan, near the provincial capital of Arkalyk, where Russian spacecraft landings occur.
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Mt. Elbrus, Caucasus Range
Published November 10, 2002
The Caucasus Mountains form a long (more than 1200 kilometers) and steep spine connecting the Black Sea to the Caspian. Mt. Elbrus, the summit of the Caucasus Mountains, is located in southern Russia just north of the Georgian border, and is distinguished as Europe’s highest peak (5642 m). Elbrus is also an ancient volcano, although it has not erupted for nearly 2000 years. Elbrus’s profile comprises two volcanic peaks (East and West). They are popular trekking and mountain climbing destinations—the saddle between them provides access to the region. In mid-September, the Russian and American crew aboard the International Space Station viewed Mt. Elbrus’s glaciated landscape as part of a study by Russian glaciologists. Elbrus is located west of the recent glacier slide on Mt. Kazbek, another giant peak in the Caucasus Mountains.
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Spectacular View of Etna from the International Space Station
Published November 5, 2002
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Key West
Published November 3, 2002
Turquoise blue waters, coral reefs and sandy beaches were apparently on the minds of International Space Station astronauts last week. As they passed over the Florida Keys, they acquired a sequence of images from Key West eastward along the outer keys. The detail of the images showcases the clarity of the Caribbean waters, and allows for mapping of both land use and shallow marine features. This image of Key West shows the intensive built-up area of the town, the offshore sand flats and grassbeds surrounding Key West, the patterns of natural tidal channels and artificially dredged channels that allow boat access to the local marinas.
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Space Shuttle view after Kolka Glacier Collapse
Published October 27, 2002
While docked to the Space Station the international crew of Space Shuttle Mission STS-112 paused as the spacecraft sped over the Caucasus Range. They had planned before launch that a crewmember would look out the windows of the spacecraft for remnants of the disastrous collapse of Kolka Glacier. The close collaboration between the USA and Russia on all aspects of Space Station construction, and the presence on the Shuttle crew of Russian mission specialist Fyodor Yurchikhin, made the crew particularly interested in photographing the area to help scientists on the ground in their studies of the collapse. There is a dramatic difference between this digital photograph taken by the Shuttle crew and one taken just a week before the collapse by the International Space Station crew.
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Sangeang Api, Indonesia
Published October 20, 2002
In 1985, the small Indonesian island of Sangeang Api (13 kilometers wide) off the northeast coast of Sumbawa began to erupt. Within a month, the 1250 inhabitants had evacuated to Sumbawa. The eruption lasted until 1988. The lava and pyroclastic flows—the wide channel running west from the summit—are still easily traced on this image taken by Space Shuttle astronauts in 2002. Today, the island’s summit crater (1949 m) produces intermittent steam clouds.
Easter Island
Published October 6, 2002
On September 25, 2002, astronauts aboard the International Space Station viewed Easter Island, one of the most remote locations on Earth. Easter Island is more than 2000 miles from the closest populations on Tahiti and Chile—even more remote than astronauts orbiting at 210 nautical miles above the Earth. Archaeologists believe the island was discovered and colonized by Polynesians at about 400 AD. Subsequently, a unique culture developed. The human population grew to levels that could not be sustained by the island. A civil war resulted, and the island’s deforestation and ecosystem collapse was nearly complete.
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A Star of Japan, Hakodate City
Published September 22, 2002
Hakodate City is a seaport located on two bays in the Oshima Peninsula near the south end of the major Japanese island of Hokkaido. This image nicely illustrates how sunglint reflecting off the ocean reveals internal waves impinging on the coast. Also, from space, Hakodate is quite distinguished from other cities of it size, featuring a large five-pointed star near it center.
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Kanaga Volcano, Alaska
Published September 15, 2002
The symmetrical cone of Kanaga volcano stands out on the northern corner of Kanaga Island, located in the central part of Alaska’s Aleutian archipelago. Kanaga last erupted in 1994 and is well known for its active fumaroles and hot springs (located, in this image, by fine steam plumes on the northeast flank of the volcano). A small lake to the southeast of the cone is situated on the floor of a larger more ancient volcanic caldera. The crew of the international space station acquired this image late in the day of August 13, 2002. Note how the late summer sun accentuates the terrain features like the volcanic flows that radiate down from the volcano’s peak, and the steep cliffs along the western coastline.
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Petroleum Infrastructure, Denver City, Texas
Published September 8, 2002
Agriculture and the petroleum industry compete for land use near Denver City, Texas, southwest of Lubbock near the New Mexico border. The economy of this region is almost completely dependent on its underground resources of petroleum and water. Both resources result in distinctive land use patterns visible from space. Historically this area has produced vast quantities of oil and gas since development began in the 1930s. Note the fine, light-colored grid of roads and pipelines connecting well sites over this portion of the Wasson Oil Field, one of the state’s most productive. Since the 1940s, agricultural land use has shifted from grazing to irrigated cultivation of cotton, sorghum, wheat, hay, and corn. The water supply is drawn from wells tapping the vast, but failing, Ogallala Aquifer. Note the large, circular center-pivot irrigation systems in the lower corners of the image. The largest is nearly a mile in diameter.
Contrail Web over the Central Rhône Valley, Eastern France
Published August 18, 2002
This digital photograph taken through the windows of the International Space Station on May 15, 2002, shows condensation trails over the Rhône Valley in the region west of Lyon. Condensation trails—or contrails—are straight lines of ice crystals that form in the wake of jet liners where air temperatures at altitude are lower than about 40°C. Newer contrails are thin whereas older trails have widened with time as a result of light winds. Because of this tendency for thin contrails to cover greater areas with time, it is estimated that these “artificial clouds” cover 0.1% of the planet”s surface. Percentages are far higher in some places such as southern California, the Ohio River Valley and parts of Europe, as illustrated here.
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