noctilucent cloud nlc night clouds like phenomena mesosphere |
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navigate by keyword : altitudes atmosphere atmospheric background believed blue bright capella cloud cloudlike clouds comes composed covering crystals dark dust earths formation from high highest holidays landscape luminescence mesosphere mesospheric micrometeors midnight natural nature night noctilucent occurrence people phenomena phenomenon shining silhouette silver space stars summer sunset that they tiny twilight upper water weather |
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Noctilucent cloud NLC, night clouds, cloud-like phenomena in mesosphere. They are highest clouds in Earth`s atmosphere, at altitudes 76-85km. Night clouds are composed of tiny crystals of water ice covering dust. It is believed that dust comes from micrometeors. |
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