Scientists are wondering what is happening over Antarctica and where are the noctilucent clouds. Noctilucent clouds or polar mesospheric clouds are the highest occurring cloud types (form about 50 miles or 80 Km above the Earth's surface). They form in the Mesosphere and are thin clouds made up of ice crystals that form from left over fine dust from meteors. Because they are so high up in the sky, you see them when the sun is low or almost nighttime. The form during the summer months over the north and south poles. That is when it is coldest that high up in the sky (in the...
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