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The spectacular clouds, known as noctilucent clouds, will be probed by NASA's Aeronomy of Ice in the Mesosphere
mission, or AIM, to determine why they form and how they change. First spotted in Earth's atmosphere in 1885, the clouds
have been increasing in frequency in recent decades and may be related to increases in carbon dioxide and methane
emissions tied to human activity on Earth. [Source: University of Colorado at Boulder]
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