EXOSPHERE

exosphere

(noun) the outermost atmospheric layer

Source: WordNet® 3.1

Etymology

Noun

exosphere (plural exospheres)

the uppermost layer of a planet's atmosphere

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)

Source: Wiktionary

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