Noctilucent clouds form about 50 miles up, higher than any other cloud; they need air below minus 184°F
Noctilucent clouds form 47 to 53 miles up, the highest on Earth, and appear only at twilight when ice crystals catch sunlight below minus 184°F.
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Noctilucent clouds form 47 to 53 miles up, the highest on Earth, and appear only at twilight when ice crystals catch sunlight below minus 184°F.
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