EntityQ1621662· pop 11· linked from 152 articlesupper atmosphereSign in to saveregion of the Earth's atmosphere in which air density or atmospheric pressure falls below a technically significant levelWikidata factsPart ofatmosphere of EarthHas partionosphereShow 1 more factP2579atmospheric soundingvia Wikidata · CC0Connectionsouter spaceEntityatmosphereEntityCategoriesAtmosphereAtmosphere of Earth