via National Geographic Photo of the Day http://ift.tt/1Gbsn0E
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Friday, June 19, 2015
NASA Night-Shining Clouds
This image of noctilucent clouds is a composite of several Aeronomy of Ice in the Mesosphere (AIM) satellite passes over the Arctic on June 10, 2015. The clouds appear in various shades of light blue to white, depending on the density of the ice particles. The instrument measures albedo—how much light is reflected back to space by the clouds. via NASA http://ift.tt/1RgjOXB
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