极地中层云也被称为夜光云层（noctilucent）（就是在夜晚还闪光的云）。这一特点在这张太空照片上显露无疑。
Polar mesospheric clouds are also known as noctilucent or “night-shining” clouds—a property that is clearly visible in this astronaut photograph.
极地中层云也被称为夜光云层（noctilucent）（就是在夜晚还闪光的云）。这一特点在这张太空照片上显露无疑。
Polar mesospheric clouds are also known as noctilucent or “night-shining” clouds—a property that is clearly visible in this astronaut photograph.
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