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Site of Carthage, Tunisia June 28, 2006

Posted by jtintle in Astronaut, Earth, EPoD, International Space Station, NASA, People, Planets, Space Agencies, Space Fotos, Spacecraft, Website.
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Site of Carthage, Tunisia


Click here to view full image (470 kb)Credit:

NASA/JSC Gateway to Astronaut Photography of Earth, NASA, ISS


The city-state of Carthage in North Africa was founded by Phoenician settlers in 814 BC, and it subsequently became the seat of a trade empire that controlled much of the western Mediterranean region (including most of the former Phoenician lands). Carthage was completely destroyed by the Roman Republic during the Third (and final) Punic War (149-146 BC). The end of Carthage has been made notorious by the story that the Romans allegedly sowed the city with salt to ensure that no further rivals to their power would arise there. However, given the great value of salt at the time and the strategic importance of the city’s location, scholars dispute whether the event actually occurred. Following the destruction of Carthage, Roman dominance of the Mediterranean continued until the fall of the Western Empire in AD 476.

The favorable location of the ancient city of Carthage is clear in this astronaut photograph. Bays along the coastline provide ready access to the Gulf of Tunis, which leads to the Mediterranean Sea. Docks along the coastline (lower right) support the shipping industry. Modern Carthage is a wealthy suburb of the Tunis metropolitan area (the center of which is located to the southwest of the image). Dense concentrations of white rooftops are obvious in the residential subdivisions to the north and south of the ancient city location. Large tracts of new developments appear to be in progress along the curving, light-colored roadways to the west of the historical city (lower image center). The green, shallow waters of an evaporating salty lake are visible at image left. Several such lakes are present in Tunisia and are centers for bird-watching tourism.

Astronaut photograph

ISS013-E-34753 was acquired June 8, 2006, with a Kodak 760C digital camera using an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and the Image Science & Analysis Group, Johnson Space Center. The image in this article has been cropped and enhanced to improve contrast. Lens artifacts have been removed. The International Space Station Program supports the laboratory 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.

Zero Order Glow and Virga December 10, 2005

Posted by jtintle in Earth, EPoD, Green Bay, Space Fotos.
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Today's Earth Science Picture of the Day.
Provided and copyright by:
Peg Zenko,

The above photo showing an isolated rain shower at sunset was taken in Green Bay, Wisconsin on October 27, 2005. Precipitation from this shower failed to reached the ground (virga). A layer of dry air between the clouds and the Earth’s surface caused the drops to evaporate soon after leaving the clouds. Virga typically originates from clouds having an altitude between 7,000 to 15,000 feet.

Especially noteworthy here is the color of the backlit drops. We’re familiar with the phenomena of drops opposite the Sun producing a rainbow, but this photo illustrates that the setting Sun shining through rain can be just as beautiful. This sunlight diffusion is called “zero order glow.” Whereas the raindrops of the primary rainbow reflect the sunlight once, and the fainter secondary bow is caused by two reflections, the zero order glow has zero reflections.

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