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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Word of the Day
3 April 2025
WHOLE
(noun) an assemblage of parts that is regarded as a single entity; “how big is that part compared to the whole?”; “the team is a unit”
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