Cosmonaut Oleg Artemyev: "Image of noctilucent clouds visible in a deep twilight. Noctilucent clouds are at a height of 70-100 km and at this height they are poorly discovered."
Noctilucent, or night-shining, clouds are the highest clouds in Earth’s atmosphere. They form in the middle atmosphere, or mesosphere, above Earth’s surface. The clouds form when water vapor freezes around specks of dust from incoming meteors.
Credit: Cosmonaut Oleg Artemyev/Roscosmos
Release Date: July 30, 2018
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