exosphere


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ex·o·sphere

 (ĕk′sō-sfîr′)
n.
1. The outermost region of a planet's atmosphere.
2. The outermost region of the earth's atmosphere, lying above the thermosphere and extending thousands of kilometers into space, from which molecules having sufficient velocity can escape the earth's gravitation.
ex′o·spher′ic (-sfîr′ĭk, -sfĕr′-) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

exosphere

(ˈɛksəʊˌsfɪə)
n
(Physical Geography) the outermost layer of the earth's atmosphere. It extends from about 400 km above the earth's surface
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ex•o•sphere

(ˈɛk soʊˌsfɪər)

n.
the highest region of the atmosphere.
[1950–55]
ex`o•spher′ic (-ˈsfɛr ɪk, -ˈsfɪər-) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

ex·o·sphere

(ĕk′sō-sfîr′)
The outermost region of the Earth's atmosphere, lying beyond the ionosphere and extending indefinitely into space. The air in the exosphere gets thinner and thinner until the lightest particles, such as hydrogen atoms, begin to escape Earth's gravity.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

exosphere

the highest portion of the earth’s atmosphere, from which air molecules can escape into space. Cf. ionosphere.
See also: Atmosphere
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.

exosphere

The outermost layer of the atmosphere of a planet.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.exosphere - the outermost atmospheric layer
layer - a relatively thin sheetlike expanse or region lying over or under another
atmosphere - the envelope of gases surrounding any celestial body
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
exosphère
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References in periodicals archive ?
The star's ultraviolet flux must be heating a fair amount of hydrogen (the lightest gas) in the upper atmosphere, enabling it to escape and form a huge "exosphere." It remains unclear whether the planet has lost a significant amount of its mass by this mechanism.
Unveiling distant worlds: astronomers have found more than 160 planets outside our solar system. What are these worlds actually like?
No, the woof in question was the sound of 30 pounds of asphyxiated canine flesh spontaneously combusting as Sputnik II burnt up in the earth's exosphere on re-entry.
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Designed and built by CU-Boulder's LASP, the Mercury Atmospheric and Surface Composition Spectrometer, or MASCS, is a power-packed, 7-pound instrument that will make measurements of Mercury's surface and its tenuous atmosphere, called the exosphere. (ANI)
NASA's Messenger set to solve tantalizing mysteries about Mercury
He added: "My dad believed in human ingenuity and he believed in mankind's destiny beyond the exosphere.
DREDGE ME UP, SCOTTY; Rocket taking Star Trek idol's ashes into space blows up over Pacific
The "woof" was the sound of 30 pounds of asphyxiated canine flesh spontaneously combusting as Sputnik II burnt up in the earth's exosphere on re-entry.
Victor Lewis-Smith's column: Dogged By Pet Shows
"If it were deposited higher," he explains, "the OH would dissociate into oxygen and hydrogen and the hydrogen would build up in the Earth's exosphere."
Cosmic rain
Data from the final flyby has revealed the first observations of ion emissions in Mercury's exosphere, or thin atmosphere; new information about the planet's magnetic substorms; and evidence of younger volcanic activity than previously recorded.
NASA's Messenger probe reveals new information about Mercury
The last sound she made was not a Russian bark (written "ccxyrop-ccxyrop"), but a good old English "woof," spontaneously combusting as Sputnik II burned up in the earth's exosphere on re-entry.
Nasty spell of This Morning sickness

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