📖 Definitions of "Exosphere"
noun
- 1
The uppermost layer of a planet's atmosphere
- 2
An extremely thin atmosphere, as on Saturn's moon Dione
""Scientists weren't even sure Dione would be big enough to hang on to an exosphere" ('Cassini Detects Hint of Fresh Air at Dione', Cassini Solstice Mission, JPL, Mar. 02, 2012)"
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