bn:00032270n
Noun Concept
Categories: Atmosphere, Articles with short description
EN
exosphere  critical level  Exoatmosphere  exoatmospheric
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EN
The exosphere is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collisionless. Wikipedia
Outermost layer of the atmosphere Wikidata
The uppermost layer of the atmosphere, its lower boundary is estimated at 500 km to 1000 km above the Earth's surface. OmegaWiki
The uppermost layer of a planet's atmosphere. Wiktionary
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