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Photos -
Noctilucent Clouds Despite appearances these are taken well after sunset. They are only visible when the sun is past the horizon far enough to illuminate these clouds which are 40-50 miles high and nothing else in the sky. Scientists don't yet fully understand the nature of these clouds as they are understandably very difficult to analyze. You can't send a plane that high. Noctilucent Cloud Links
Noctilucent Cloud: Observers' Homepage
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