Luminous night clouds are a type of cloud that occur at an altitude of about 75 to 85 kilometres, much higher than ordinary clouds, which reach an altitude of about 20 kilometres at most. After sunset, those high clouds still reflect sunlight for some time. The ordinary clouds, which we usually see, stick out dark and turn red first and then dark gray after sunset. The shining night clouds then remain white, yellow-orange or light blue. The stars remain visible in these thin clouds.
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