Question

what are noctilucent clouds
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Answer 1

Answer:

a luminous cloud of a kind occasionally seen at night in summer in high latitudes, at the altitude of the mesopause.

"he estimated the height of the noctilucent clouds he saw at 80 to 100 km"

Explanation:

Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth. They consist of ice crystals and are only visible during astronomical twilight. Noctilucent roughly means "night shining" in Latin

Altitude: 76,000 to 85,000 m; (250,000 to 280,000 ft)

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