If you noticed bright cloud low to the north after 11pm on July 7th, it was actually a fine display of Noctilucent cloud. These clouds are the highest known clouds in the Earth’s atmosphere, some 50 miles up, and shine with a characteristic silvery blue hue, and can be seen long after midnight low above the northern horizon at this time of year. [Read more about Noctilucent Cloud Display Visible]
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