|
|
Browse All
:
Images of Chad
Description
ISS012-E-09639 (29 Nov. 2005) --- The impact of an asteroid or comet several hundred million years ago, according to scientists, left scars in the landscape that are still visible in this International Space Station/Expedition 12 picture of an area in the Sahara Desert of northern Chad. The concentric ring structure is the Aorounga impact crater, with a diameter of about 17 kilometers (10.5 miles). The original crater was buried by sediments, which were then partially eroded to reveal the current ring-like appearance. Scientists note a number of valleys cut by thousands of years of wind erosion. The area shown is centered at approximately 19.1 degrees north latitude and 19.3 degrees east longitude.
Description
STS105-E-5434 (21 August 2001) --- Lake Chad and parts of Chad, Niger and Cameroon in Africa are pictured in this digital still camera's image recorded by the STS-105 crew members toward the end of their mission. The scene was captured though one of the overhead windows on the aft flight deck of the Space Shuttle Discovery.
Description
STS087-717-075 (19 November ? 5 December 1997) --- Featured in this view is the Tibesti Massif in northern Chad in central Saharan Africa is a very large mountain range of old, dark, hard rocks, which is surrounded by sand seas. The mountains are capped with recent volcanoes and volcanic flows. The volcanoes of Tibesti are similar to those of Hawaii -- they are thought to be the result of a large hot spot deep in the Earth underneath northern Africa. The most striking volcano is the Pic Tousside (3,265 meters). The lava flows down the flanks of Pic Tousside make a characteristic and recognizable shape something like a giant squid -- thus providing astronauts a key visual marker as they fly across northern Africa. Because northern Africa receives very little rainfall, the volcano and crater shapes look very ?young?. The occasional rainfall has created small gullies down the sides of the mountains, which can be seen when the sunlight is relatively low. Small amounts of water leach the soluble elements, like sodium, from the lavas. When the water collects in low places, like at the bottom of craters such as Trou au Natron (the crater adjacent to Pic Tousside) and subsequently evaporates, sodium-rich deposits are left behind. The white region at the bottom of the crater Trou au Natron is a sodium carbonate (natronite) deposit. This picture is one of the 70mm Earth observations visuals used by the crew at its post flight presentation events.
Description
STS108-701-008 (5-17 December 2001) --- The vertical stabilizer of the Space Shuttle Endeavour almost appears to point out Emi Koussi Volcano in the Tibesti Mountains of Chad in Saharan Africa. Emi Koussi is one of the prominent volcanoes within the Tibesti massif of north-central Africa. The dark, shield-shaped volcanic edifice has developed over a mantle hot spot that rises beneath this region of the African continent.
|
