exosphere

The upper part of the thermosphere. It is the topmost part of the atmosphere and is approximately 300 to 600 miles (500–1000 km) above the earth’s surface. In this region, the atmosphere is extremely tenuous because of high temperature and low density; some of the atoms and molecules escape the earth’s gravitational field.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Exosphere — Exosphère Schéma des couches de l atmosphère (à l echelle). La stratosphère ( 50 km) ne compte que pour environ 1% de l atmosphère. On considère que l exosphère (observable depuis l espace) s étend jusqu à 100 000 km. L exosphère est la dernière… …   Wikipédia en Français

  • exosphère — [ ɛgzɔsfɛr ] n. f. • 1951; de exo et (atmo)sphère ♦ Géophys. Partie la plus élevée de l atmosphère (au dessus de 750 km) où les molécules les plus légères échappent à la pesanteur et sont attirées vers l espace intersidéral. ● exosphère nom… …   Encyclopédie Universelle

  • exosphere — ☆ exosphere [eks′ō sfir΄, eks′əsfir΄ ] n. [ EXO + SPHERE] the outermost portion of a planet s, esp. the earth s, atmosphere, consisting of a hot layer of light atoms often moving at escape velocity …   English World dictionary

  • Exosphere — Earth atmosphere diagram showing the exosphere and other layers. The layers are to scale. From Earth s surface to the top of the stratosphere (50km) is just under 1% of Earth s radius. The exosphere is the uppermost layer of Earth s atmosphere.… …   Wikipedia

  • Exosphère — Schéma des couches de l atmosphère (à l echelle). La stratosphère ( 50 km) ne compte que pour environ 1% de l atmosphère. On considère que l exosphère (observable depuis l espace) s étend jusqu à 100 000 km. L exosphère est la dernière couche d… …   Wikipédia en Français

  • exosphere — exospherical /ek seuh sfer i keuhl, sfear /, exospheric, adj. /ek soh sfear /, n. the highest region of the atmosphere, where the air density is so low that a fast moving air molecule is more than 50 percent likely to escape from the atmosphere… …   Universalium

  • Exosphere —    The farthest region of a planet s atmosphere. In this region particles can escape into space. The exosphere of Earth is about 400 km (249 miles) above the surface …   The writer's dictionary of science fiction, fantasy, horror and mythology

  • exosphere — egzosfera statusas T sritis ekologija ir aplinkotyra apibrėžtis Tarpinė zona tarp Žemės atmosferos ir tarpplanetinės erdvės – aukščiausias išorinis atmosferos sluoksnis, prasidedantis virš termosferos (vidutiniškai 600 km aukštyje). atitikmenys:… …   Ekologijos terminų aiškinamasis žodynas

  • exosphere — noun Etymology: International Scientific Vocabulary Date: 1949 the outer fringe region of the atmosphere of the earth or a celestial body (as a planet) • exospheric adjective …   New Collegiate Dictionary

  • exosphere — noun the uppermost layer of a planets atmosphere …   Wiktionary

  • exosphere — n. highest level of the atmosphere …   English contemporary dictionary

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