Last updated on April 16, 2014 at 16:55 EDT
Canadian NLCs
11 of 21

Canadian NLCs

December 12, 2012
This Notilucent cloud image was taken on July 2, 2011 near Edmonton, Alberta Canada. The photographer said he "Noticed the clouds just before local midnight, continued past 2:00 am and were still bright enough to reflect in a local slough." Credit: NASA/Dave Hughes