Climate models predict that increased greenhouse gas emissions cause a cooling of the mesosphere, which would lead to more frequent and widespread occurrences of noctilucent clouds.
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NASA reported that the light came from an artificial noctilucent cloud formed by the exhaust particles of the rocket's fourth stage at an altitude of about.
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Chapman's role in the IGY and his support for amateur's work in auroras and noctilucent clouds, especially also with the Germans, has been discussed by Wilfried Schr�der.
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The possibility that small particles left behind on the orbital path almost one hundred days after the nucleus has passed could form noctilucent clouds is also slim.
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Also, some noctilucent clouds are made of smaller crystals, 30 nm or less, which are invisible to observers on the ground because they do not scatter enough light.
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The first physical confirmation that water ice is indeed the primary component of noctilucent clouds came from the HALOE instrument on the Upper Atmosphere Research Satellite in 2001.
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Blamont is credited with the discovery of Turbopause in 1959, the Interstellar wind in 1970, the Hydrogen envelope of comets in 1971 and the polar Noctilucent clouds in 1973.
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Project PoSSUM, the first commercial suborbital research program, offers its own space training program supporting PoSSUM upper atmospheric and noctilucent cloud research campaigns that use manned commercial space vehicles.
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"The most severe effect of entry through a noctilucent cloud would probably be the erosion of the thermal protection system during the most critical heating region, " the report said.
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"' Noctilucent clouds "'are the highest clouds in Earth's atmosphere, being bright polar mesospheric clouds illuminated by the Arctic sun from below the horizon, between latitudes of 50?and 70?
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