Noctilucent clouds are very high clouds in the atmosphere refract the light at dusk when the sun had sunk, illuminates / illuminate the sky with a light source that is not visible.
Wednesday, June 8, 2011
Noctilucent Cloud
Noctilucent clouds are very high clouds in the atmosphere refract the light at dusk when the sun had sunk, illuminates / illuminate the sky with a light source that is not visible.
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