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Nyte_Byrd
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Strange Clouds Spotted at the Edge of Space
09/02/08 at 13:00:20
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Strange Clouds Spotted at the Edge of Space

A weirdly wonderful sight appeared to astronauts aboard the International Space Station this summer thin blue clouds hovering at the boundary between Earth's atmosphere and the void.

The noctilucent or "night-shining" clouds are at an altitude of 47 to 53 miles (76 to 85 km), where meteors and bright aurora lights are not uncommon and the atmosphere gives way to the blackness of space. The clouds remain a scientifically baffling phenomenon more than 120 years after their discovery.

"It's lovely," said Gary Thomas, an atmospheric scientist at the University of Colorado after looking at a photo taken from the space station. "And it shows just how high these clouds really are at the very edge of space."

The clouds form at dizzying heights where the air is one hundred million times drier than the Sahara. By contrast, the common high-altitude cirrus clouds only reach heights of 11 miles (18 km) up.

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