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Examples
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When viewed from space, the mysterious clouds are known scientifically as Polar Mesospheric Clouds, or PMCs, when seen from the ground they are called Noctilucent or "night-shining"
Green Options 2009
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'Noctilucent' or 'night-shining' clouds form at the outer limits of the upper atmosphere and reflect the sun's light long after it has gone down over the horizon.
Signs of the Times 2010
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"Noctilucent", or night-shining, clouds float dozens of kilometres higher than other clouds, at an altitude of about 80 kilometres.
Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7 2009
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Noctilucent clouds are clouds that naturally occur at 50 miles above the earth and glow at night.
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Noctilucent clouds were first observed in 1885 by an amateur astronomer.
WHAT REALLY HAPPENED 2009
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Noctilucent clouds are characterised as wispy and silvery-blue
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Noctilucent clouds appear as wispy, luminous, silvery-blue clouds in the dark Northern sky, often with a wavy pattern.
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Noctilucent clouds form at the top of the mesosphere, the coldest region of the Earth's atmosphere at - 150C.
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Noctilucent clouds wax and wane over a period of 27 days, which suggests that their formation is partly controlled by the rotation of the sun
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Noctilucent clouds wax and wane over a period of 27 days, which suggests that their formation is partly controlled by the rotation of the sun
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