exosphere

[ ek-soh-sfeer ]

/ ˈɛk soʊˌsfɪər /

noun

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 instead of hitting other molecules.

Origin of exosphere

First recorded in 1950–55; exo- + -sphere

OTHER WORDS FROM exosphere

ex·o·spher·i·cal

[ek-suh-sfer-i-kuhl, -sfeer-], /ˌɛk səˈsfɛr ɪ kəl, -ˈsfɪər-/, ex·o·spher·ic, adjective

Words nearby exosphere

exorcize, exordium, exoserosis, exoskeleton, exosmosis, exosphere, exospore, exosporium, exostosis, exostosis cartilaginea, exoteric

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for exosphere

The atoms of the exosphere were lonely, uncrowded, isolated particles.
First on the Moon|Jeff Sutton
His instruments told him they were breaching the exosphere, where molecular matter had almost ceased to exist.
First on the Moon|Jeff Sutton
In the shed on the left is Orion, which is a two-stage rocket for deep penetration into the exosphere.
The Scarlet Lake Mystery|Harold Leland Goodwin

British Dictionary definitions for exosphere

exosphere

/ (ˈɛksəʊˌsfɪə) /

noun

the outermost layer of the earth's atmosphere. It extends from about 400 km above the earth's surface

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for exosphere

exosphere

[ ĕk′sō-sfîr′ ]

The outermost region of the Earth's atmosphere, beginning at an altitude of approximately 550 km to 700 km (341 to 434 mi) and merging with the interplanetary medium at around 10,000 km (6,200 mi). The exosphere consists chiefly of ionized hydrogen, which creates the geocorona by reflecting far-ultraviolet light from the Sun. On the remote edges of the exosphere, hydrogen atoms are so sparse that each cubic centimeter might contain only one atom; furthermore, the pressure and gravity are weak enough that atoms in the exosphere can escape entirely and drift into space. Artificial satellites generally orbit in this region. See also mesosphere stratosphere thermosphere troposphere. See illustration at atmosphere.

单词	exosphere
释义	exosphere [ ek-soh-sfeer ] / ˈɛk soʊˌsfɪər / noun 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 instead of hitting other molecules. Origin of exosphere First recorded in 1950–55; exo- + -sphere OTHER WORDS FROM exosphere ex·o·spher·i·cal [ek-suh-sfer-i-kuhl, -sfeer-], /ˌɛk səˈsfɛr ɪ kəl, -ˈsfɪər-/, ex·o·spher·ic, adjective Words nearby exosphere exorcize, exordium, exoserosis, exoskeleton, exosmosis, exosphere, exospore, exosporium, exostosis, exostosis cartilaginea, exoteric Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for exosphere The atoms of the exosphere were lonely, uncrowded, isolated particles. First on the Moon\|Jeff Sutton His instruments told him they were breaching the exosphere, where molecular matter had almost ceased to exist. First on the Moon\|Jeff Sutton In the shed on the left is Orion, which is a two-stage rocket for deep penetration into the exosphere. The Scarlet Lake Mystery\|Harold Leland Goodwin British Dictionary definitions for exosphere exosphere / (ˈɛksəʊˌsfɪə) / noun the outermost layer of the earth's atmosphere. It extends from about 400 km above the earth's surface Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for exosphere exosphere [ ĕk′sō-sfîr′ ] The outermost region of the Earth's atmosphere, beginning at an altitude of approximately 550 km to 700 km (341 to 434 mi) and merging with the interplanetary medium at around 10,000 km (6,200 mi). The exosphere consists chiefly of ionized hydrogen, which creates the geocorona by reflecting far-ultraviolet light from the Sun. On the remote edges of the exosphere, hydrogen atoms are so sparse that each cubic centimeter might contain only one atom; furthermore, the pressure and gravity are weak enough that atoms in the exosphere can escape entirely and drift into space. Artificial satellites generally orbit in this region. See also mesosphere stratosphere thermosphere troposphere. See illustration at atmosphere. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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