PICTURES: "Night Shining" Clouds Getting Brighter

PICTURES:
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Since 2007, scientists using the AIM satellite have been documenting night-shining clouds as seen from space, such as the above clouds (seen in white and blue) over the Arctic regions of Europe and North America on June 11, 2007--four days before the previous photograph was taken.

Based on five polar seasons of data, the satellite has revealed that the clouds' seasonal appearances turn on and off as abruptly as a "geophysical light bulb," according to the AIM Web site.
— Image courtesy NASA
 
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