@gettaxed1: Noctilucent clouds form at altitudes of about 76–85 km (roughly 250,000–280,000 feet), high in the mesosphere. They consist of tiny ice crystals that scatter sunlight after the Sun has set below the horizon, which is why they’re also called “night-shining clouds.” They are classified by structure into several main types: Type I – Veils: Thin, featureless sheets that often form the background for other structures. Type II – Bands: Long, roughly parallel streaks that can stretch across large portions of the sky. Type III – Billows (or waves): Shorter, more closely spaced, undulating or wave-like patterns. Type IV – Whirls: Looping, twisted, or ring-like structures. Amorphous / complex forms: Irregular or mixed structures that don’t fit neatly into the categories above.

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Saturday 22 August 2026 01:19:43 GMT