Twelve-Years Ago Today. Semester at Sea, Spring 2013 Enrichment Voyage. Baltic Sea.
Noctilucent Clouds viewed from my cabin on the MV Explorer while traveling from Stockholm to Copenhagen while crossing the Baltic Sea. Noctilucent clouds are high-altitude clouds that appear as glowing blue or silver streaks in the night sky, typically visible during summer months at high latitudes (or winter months in the southern hemisphere). They are tiny ice crystals illuminated by the sun below the horizon and only visible from the ground during astronomical twilight.

More images of Noctilucent Clouds are available in my PhotoShelter Gallery.
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