exosphere
noun
exo·sphere
| \ ˈek-sō-ˌsfir
\
\
Definition of exosphere
: the outer fringe region of the atmosphere of the earth or a celestial body (such as a planet)
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Other Words from exosphere
exospheric
\ ˌek-sō-ˈsfir-ik
, -ˈsfer-
\
adjective
, -ˈsfer-
\
adjective
Examples of exosphere in a Sentence
Recent Examples on the Web
The problem is that if there really are 1,000 ions per cubic centimeter, the ionization of gas in the lunar exosphere can’t account for such a high concentration—there just isn’t enough gas. — Daniel Oberhaus, WIRED, "Lunar Mysteries That Science Still Needs to Solve," 16 July 2019 In the 1970s two Soviet lunar orbiters discovered that ions also existed in the moon’s ultra-thin exosphere, and scientists have been trying to explain this observation ever since. — Daniel Oberhaus, WIRED, "Lunar Mysteries That Science Still Needs to Solve," 16 July 2019 Instead scientists refer to its extremely thin covering of oxygen, hydrogen, sodium, helium, and potassium as an exosphere. — National Geographic, "The solar system, explained," 27 Mar. 2019 Because nitrogen is a volatile chemical, some of it sublimates and gives Pluto a tenuous atmosphere still thick enough to be more than an exosphere. — John Wenz, Popular Mechanics, "Here's What We Know About Pluto So Far," 17 July 2015 The spacecraft has two spectrometers that will be analyzing the exosphere. — Joe Pappalardo, Popular Mechanics, "4 More Hurdles the LADEE Moon Mission Must Clear," 9 Sep. 2013 Team Unsullied seemed poised for a predictable victory, when suddenly — his square jawline visible from the exosphere — along came dependable ol’ Jaime Lannister, sacking Highgarden and laying waste to Dany’s plans at the last minute. — Anna Silman, The Cut, "I’m Rooting for the Lannisters," 4 Aug. 2017 Giant Steps set a new benchmark for virtuosity and harmonic complexity, a manned probe into jazz’s exosphere. — Julian Sancton, Billboard, "Remembering Jazz's Greatest Year With the Living Legends of 1959," 5 May 2017 And charged particles in the exosphere can be carried around and away from the planet by the magnetic field. — Lisa Grossman, WIRED, "Mercury Flyby Maps New Territory," 15 July 2010These example sentences are selected automatically from various online news sources to reflect current usage of the word 'exosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for exosphere
exosphere
noun
exo·sphere
| \ ˈek-sō-ˌsfir
\
\
Kids Definition of exosphere
: the outermost region of the atmosphere