Nasa: Central Tien Shan. China - Cape Verde - Satellite images - Imágenes de satelite

Posted by Ricardo Marcenaro | Posted in | Posted on 20:55


Open your mind, your heart to other cultures
Abra su mente, su corazón a otras culturas
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Usted será una mejor persona
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Central Tien Shan, China

The Tien Shan—“celestial mountains” in Chinese—is one of the largest continuous mountain ranges in the world, extending approximately 2,500 kilometers (1,550 miles) roughly east-west across Central Asia. This astronaut photograph provides a view of the central Tien Shan, about 64 kilometers (40 miles) east of where the borders of China, Kyrgyzstan, and Kazakhstan meet.
While the image looks like it might have been taken from an airplane, it was taken from the International Space Station (ISS) at an altitude of 341 kilometers (211 miles). The altitude plus the horizontal distance from the site—ISS was approximately 304 kilometers (289 miles) to the southwest—produces an oblique view. This angle, together with shadowing of valleys, accentuates the mountainous topography.
Like the Himalayas to the south, the uplift of the Tien Shan results from the ongoing collision between the Eurasian and Indian tectonic plates. The rugged topography of the range is the result of subsequent erosion by water, wind and, in the highest parts of the range, active glaciers. Two types of glaciers are visible in the image; cirque glaciers occupy amphitheater-like depressions on the upper slopes of the mountains, and feed ice downslope to aggregate into large valley glaciers such as the one at image center. Low clouds obscure an adjacent valley and glaciers to the north (upper left).
Two high peaks of the central Tien Shan are identifiable in the image. Xuelian Feng has a summit of 6, 527 meters (21,414 feet) above sea level. To the east, the aptly-named Peak 6231 has a summit 6,231 meters (20,443 feet) above sea level.
Astronaut photograph ISS027-E-5274 was acquired on March 16, 2011, with a Nikon D2Xs digital camera using an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. The image was taken by the Expedition 27 crew. The image has been cropped and enhanced to improve contrast. Lens artifacts have been removed. The International Space Station Program supports the laboratory as part of the ISS National Lab to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by William L. Stefanov, NASA-JSC.
Instrument: 
ISS - Digital Camera

Cape Verde

The Cape Verde Archipelago lies some 650 kilometers (400 miles) off the coast of Senegal. Clear skies allowed the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite to acquire this natural-color image of the island chain on November 23, 2010. Against a navy background, the brown and green islands roughly form the shape of a giant V turned on its side.
The island chain includes a variety of terrain and vegetation. On islands in the east—Boa Vista and its neighbors—earth tones predominate. These islands are generally flat with little fresh water. In the west, more mountainous islands boast more abundant greenery. The highest point in Cape Verde is in the southwest: the volcanic summit of Fogo at 2,829 meters (9,281 feet).
Despite the islands’ varied appearances, geologists surmise that all of the islands are volcanic in origin, sitting over a hotspot where magma pushes up through the Earth’s crust and erupts on the sea floor.
Probably the best-known example of a hotspot is Hawaii. On a fast-moving plate, the Hawaiian Islands show a clear linear progression in age, with old Kauai in the northwest and young Hawaii (Big Island) in the southeast. Cape Verde, however, is roughly stationary with respect to the mantle plume responsible for its growth. As a result, the ages of the islands lack the same clarity as in Hawaii. In general, Cape Verde islands appear oldest in the east (Boa Vista and its neighbors) and youngest in the northwest and southwest.
Volcanic activity is not the only force shaping Cape Verde. Just as magma elevates landmasses, relentless winds grind them down. Winds blow often over Cape Verde, and the winds frequently carry heavy loads of Saharan dust. Wind erosion may be more apparent along the islands from Boa Vista to Santo Antão, which bear the brunt of Saharan winds.

  1. References

  2. Global Volcanism Program. Fogo. Smithsonian Institution. Accessed December 15, 2010.
  3. Lodge, A., Helffrich, G. (2006). Depleted swell root beneath the Cape Verde Islands. Geology, 34(6), 449–452.
  4. Wikipedia. (2010, December 14). Geography of Cape Verde. Accessed December 15, 2010.
NASA image courtesy Jeff Schmaltz, MODIS Rapid Response Team at NASA GSFC. Caption by Michon Scott.
Instrument: 
Terra - MODIS




Nasa: Central Tien Shan. China - Cape Verde - Satellite images - Imágenes de satelite



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En el blog: Solitary Dog Sculptor I, la guia alfabética está en el costado derecho de la página
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My blogs are an open house to all cultures, religions and countries. Be a follower if you like it, with this action you are building a new culture of tolerance, open mind and heart for peace, love and human respect.

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