1) Layer
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https://www.crosswordclues.com/clue/exosphere
The exosphere (ἔξω éxō `outside, external, beyond`, σφαῖρα sphaĩra `sphere`) is a thin, atmosphere-like volume surrounding a planetary body where molecules are gravitationally bound to that body, but where the density is too low for them to behave as a gas by colliding with each other. In the case of bodies with substantial atmos...
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http://en.wikipedia.org/wiki/Exosphere
The outermost layer of the Earth's atmosphere.
Found on
http://www.bbc.co.uk/weather/weatherwise/glossary/e.shtml
The part of the Earth atmosphere above the thermosphere which extends into space. H and He atoms can attain escape velocities at the outer rim of the exosphere.
Found on
http://www.braeunig.us/space/glossary.htm
outermost region of a planet`s atmosphere, where molecular densities are low and the probability of collisions between molecules is very small. The ... [1 related articles]
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http://www.britannica.com/eb/a-z/e/59
The extremely tenuous, outermost layer of Earth`s atmosphere. The exosphere lies above the ionosphere and extends from the so-called exobase, at a height of about 500 km, to the edge of interplanetary space. At or below the exobase, the atmosphere is sufficiently dense that collisions dominate the...
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http://www.daviddarling.info/encyclopedia/E/exosphere.html
the outer part of the Earth's atmosphere located above the thermosphere, in which the collision frequency is sufficiently low that the probability that certain particles will escape towards free space is relatively high when the vertical velocity of these particles is sufficiently high
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-06-13
The outermost part of the Earth's atmosphere. It is an ill-defined, highly rareified zone which starts at a height of about 700km (435 miles) and extends into the vacuum of space.
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http://www.encyclo.co.uk/local/20448
The outermost zone in the Earth's atmosphere. This layer has an altitude greater than 480 kilometers and is primarily composed of hydrogen and helium gas.
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http://www.physicalgeography.net/physgeoglos/e.html
the outer-most layer of the Earth's atmosphere (500 to 1000km above surface); the only part of the atmosphere where an appreciable amount of atmospheric gases escape the Earth.
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http://www.tsgc.utexas.edu/stars/metgloss.html
[
n] - the outermost atmospheric layer
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http://www.webdictionary.co.uk/definition.php?query=exosphere
This region is considered the very outer limits of the earth's atmosphere. Its lower boundary is often called the critical level of escape, where gas atoms are so widely spaced that they rarely collide with one another and have individual orbits. It is roughly 640000 metres above the surface of the Earth.
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https://www.encyclo.co.uk/local/20687
The layer of the atmosphere lying above 400 km altitude. More Information.
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https://www.encyclo.co.uk/local/20751
noun the outermost atmospheric layer
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https://www.encyclo.co.uk/local/20974
Uppermost layer of the atmosphere. It is an ill-defined zone above the thermosphere, beginning at about 700 km/435 mi and fading off into the vacuum of space. The gases are extremely thin, with hydrogen as the main constituent
Found on
https://www.encyclo.co.uk/local/21221
The outermost part of the Earth's atmosphere.
Found on
https://www.encyclo.co.uk/local/22784
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.
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https://www.infoplease.com/dictionary/exosphere
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