This is very cool:
STRANGE CLOUDS; Last night, sky watchers in Northern Ireland witnessed a vivid display of electric-blue noctilucent clouds. Also known as "NLCs," these clouds float through the outer reaches of Earth's atmosphere at the very edge of space. They are most often seen from far-northern places such as Scandinavia or Canada, but in recent years they have been spotted as far south as Colorado and Utah. Last night's display marks the beginning of the 2006 noctilucent cloud season. Visit http://spaceweather.com for observing tips and a gallery of recent sightings.
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