exosphere
noun
exo·sphere
ˈek-sō-ˌsfir 
: the outer fringe region of the atmosphere of the earth or a celestial body (such as a planet)
Examples of exosphere in a Sentence
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The Sphere, which connects to the Venetian Resort, has also become a magnet for visitors who want to gape at the visually arresting exosphere, which, as of July also includes a musical backdrop within the footprint of the venue.
—
Melissa Ruggieri, USA TODAY, 28 Feb. 2025
The origin of that exosphere had been uncertain since its discovery in the 1970s.
—Jonathan O’Callaghan, Discover Magazine, 21 Oct. 2024
Studying the moon:What sustains the lunar exosphere?
—Eric Lagatta, USA TODAY, 12 Aug. 2024
These elements are linked to both processes, indicating that both micrometeoroids and solar wind added to the Moon’s exosphere.
—Jonathan O’Callaghan, Discover Magazine, 21 Oct. 2024
See All Example Sentences for exosphere
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Melissa Ruggieri, USA TODAY, 28 Feb. 2025
The origin of that exosphere had been uncertain since its discovery in the 1970s.
—Jonathan O’Callaghan, Discover Magazine, 21 Oct. 2024
Studying the moon:What sustains the lunar exosphere?
—Eric Lagatta, USA TODAY, 12 Aug. 2024
These elements are linked to both processes, indicating that both micrometeoroids and solar wind added to the Moon’s exosphere.
—Jonathan O’Callaghan, Discover Magazine, 21 Oct. 2024
See All Example Sentences for exosphere
Cite this Entry
“Exosphere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exosphere. Accessed 9 Mar. 2025.
Copy CitationKids Definition
exosphere
noun
exo·sphere
ˈek-sō-ˌsfi(ə)r
: the outermost region of the atmosphere of the earth or a planet
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