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A nesting stork stands against a back drop of noctilucent clouds.

Noctilucent Cloud Season Begins

Noctilucent clouds are back for 2011 and continue spreading to ever lower latitudes.

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Composite image of noctilucent cloud cover above the South Pole on December 31, 2009.

Clouds, Clouds, Burning Bright

The NASA mission Aeronomy of Ice in the Mesosphere has shown that night-shining 'noctilucent' cloud formation is changing year to year, showing a ...

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This image of polar mesospheric clouds, as viewed from-the-side through the Earth’s atmosphere, was taken by the Expedition 22 crew on board the International Space Station on January 30, 2010 while located over the southern Atlantic Ocean.

Polar Mesospheric Clouds, Southern Hemisphere

A striking ISS astronaut photograph shows polar mesospheric clouds over the Southern Hemisphere on January 30, 2010.

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