The Planetary Society
Gallery · APOD
NASA Science
Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Normally too dim to be seen, they may become visible just after sunset…
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- APOD · NASA — public domain
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- ap261027
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- Credit as published
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- APOD release page
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