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Key terms: ice water observed noctilucent clouds atmosphere polar dust caused sun rocket mesosphere satellite change lower gadsden hemisphere solar increase visible crystals layer surface exhaust composed volcanic evidence sodium altitude frequent water ice methane patterns ultraviolet black brant radiation discovery emissions water vapour occurrence phenomenon instrument scientists temperatures united states highest clouds climate change southern hemisphere upper atmosphere below the horizon northern hemisphere Search external links cited by footnotes on Wikipedia page Noctilucent cloud: |
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