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
Recent Examples on the Web
The $97 million Carruthers mission carries two co-aligned ultraviolet imagers designed for simultaneous observations of Earth's exosphere, a tenuous cloud of hydrogen gas that fades into the airless void of outer space about halfway to the Moon.
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Kyle Orland, ArsTechnica, 24 Sep. 2025
The Carruthers Geocorona Observatory is a small satellite that will be dedicated to observing the exosphere, or Earth’s outermost atmospheric layer.
—Ashley Strickland, CNN Money, 24 Sep. 2025
The exosphere is the uppermost layer of Earth’s atmosphere, 375 miles (600 kilometers) above the ground.
—Ryan French, The Conversation, 24 Sep. 2025
Sweeney's campaign, which launched on Wednesday and is reportedly the company's most expensive campaign to date, will also run across the exosphere of Las Vegas's 3D display orb Sphere.
—Aishwarya Venugopal, USA Today, 25 July 2025
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Kyle Orland, ArsTechnica, 24 Sep. 2025
The Carruthers Geocorona Observatory is a small satellite that will be dedicated to observing the exosphere, or Earth’s outermost atmospheric layer.
—Ashley Strickland, CNN Money, 24 Sep. 2025
The exosphere is the uppermost layer of Earth’s atmosphere, 375 miles (600 kilometers) above the ground.
—Ryan French, The Conversation, 24 Sep. 2025
Sweeney's campaign, which launched on Wednesday and is reportedly the company's most expensive campaign to date, will also run across the exosphere of Las Vegas's 3D display orb Sphere.
—Aishwarya Venugopal, USA Today, 25 July 2025
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 Oct. 2025.
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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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