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.

exosphere

(ˈɛksəʊˌsfɪə)
n
(Physical Geography) the outermost layer of the earth's atmosphere. It extends from about 400 km above the earth's surface

ex•o•sphere

(ˈɛk soʊˌsfɪər)

n.
the highest region of the atmosphere.
[1950–55]
ex`o•spher′ic (-ˈsfɛr ɪk, -ˈsfɪər-) adj.

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.

exosphere

the highest portion of the earth’s atmosphere, from which air molecules can escape into space. Cf. ionosphere.
See also: Atmosphere

exosphere

The outermost layer of the atmosphere of a planet.
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
Translations
exosphère
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.
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.
Beginning at the orbit of the International Space Station and stretching nearly halfway to the Moon, the thin uppermost region of our atmosphere, called the exosphere, serves as a transition layer between the Earth and outer space.
Consequently, I think Owen Burrows has found an extremely good opening for Muntazah, who was unlucky in running when fourth in the Dante and receives more than a stone from Exosphere and 13lb from the rest of the field.
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)
He added: "My dad believed in human ingenuity and he believed in mankind's destiny beyond the exosphere.
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.
"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."
The spacecrafts cosmic dust analyzer (CDA) instrument has collected many nanometer-size ring particles while flying through the planet-ring gap, while its ion and neutral mass spectrometer (INMS) has sniffed the outermost atmosphere, called the exosphere.
Two of the field were supplementary entries after Godolphin paid PS30,000 to add Tercentenary Stakes winner Hawkbill and Time Test's owner Khalid Abdullah, who also has Hardwicke disappointment Exosphere entered, inserted Countermeasure as a pacemaker.
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.
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.