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Why Certain Clouds Glow Electric Blue at Night—And What They Reveal About the Upper Atmosphere

为何某些云层在夜间发出电蓝色辉光?它们揭示了高层大气的哪些秘密

Why Certain Clouds Glow Electric Blue at Night—And What They Reveal About the Upper Atmosphere

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  1. Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon.

  2. They form near the mesosphere, about 80–85 km above Earth—far higher than normal clouds.

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