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Polar stratospheric clouds (also called Nacreous clouds) form at altitudes of 15,000–25,000 meters (49,000–82,000 ft), below the ice sublimation point, usually around −85 °C, best observed during twilight.
(This post was last modified: 20-04-2024, 05:36 PM by
Levin.)
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i remember concorde supersonic jet fly through those cloud