Tag Archive: photography

Deceiving desert looks like it is made of ice

namib-desert

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Maybe like me, you thought this image was of a mountain, climbing out of a snowy plain. In fact, it is a satellite photo taken of the Namib desert, in Namibia. The snowy plain is in fact a sand sea – a giant area filled with little but wind-blown sands. It has the appearance of ice and snow because the sand has a high level of reflectivity or albedo, bouncing the light back into space. The hills in the center of the image are devoid of sand, causing them to reflect different amounts of light back. This region of Africa has been arid for millions of years. The cause lies in its geography. Lying on the western coast of Africa, it sits next to the cool waters of the Atlantic Ocean. Air masses in the region get cooled by the ocean, precipitating out their rain over the waters. By the time the air masses travel over the land, they are …

Star trails in the southern skies

star-trails-small

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The movements of the heavens above are sometimes hard to notice. This photo, however, shows clearly the stars rotating around the Earth’s rotational axis. The telescope in the foreground is the¬†Yepun telescope (UT4) in the Very Large Telescope (VLT) complex at Paranal Observatory, Chile. The picture¬†was taken by Farid Char, an astrophotographer from Chile. I asked him a few questions about his magnificent picture: How long does it take to create the picture? The photo is an artistic composition. I took several captures, then stacked them, but I superimposed a single frame to see the telescope quiet, otherwise it would appear distorted because of its continuous movement during the night. The basics of the picture are shown on its web section, but I can tell you is a composition of 867 single captures over a tripod (15” each), and the overall exposition was 4 hours 12 mins (from 23:50 h to 04:02 h local time). What does it mean to …

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