MEANING
The extremely sparse outer region of an atmosphere, where some particles can escape into space.
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Words that belong together
- planetary exosphere
- tenuous exosphere
On the page
The probe sampled hydrogen in the planet’s exosphere.
Beyond the exosphere, the station’s cameras saw only stars.
Related words
Word forms
- Base
- exosphere
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Usage notes
Primary category: sci-fi. Forms: Singular: exosphere; plural: exospheres. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.
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