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.

Mark missed the display (he was in the Lake District facing SW).  But a picture of the display taken from Scarborough can be found on the BBC News -York and North Yorkshire web site.


Image Credit:

Our website picture: NASA