exosphere

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UK/ˈɛksəʊsfɪə/US/ˈɛksoʊsfɪɚ/

noun

the uppermost layer of a planet's atmosphere

“"Scientists weren't even sure Dione would be big enough to hang on to an exosphere" ('Cassini Detects Hint of Fresh Air at Dione', , JPL, Mar. 02, 2012)”

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Meanings

nounexosphere (plural exospheres)

plural exospheres

  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', , JPL, Mar. 02, 2012)

Origin

From exo- + -sphere.

Full word history & related roots →

Translations

Basque exosfera
  • exosferathe uppermost layer of a planet's atmosphere
Catalan exosfera
  • exosferathe uppermost layer of a planet's atmosphere
Chinese Mandarin 散逸層 /散逸层, 外氣層 /外气层
  • 散逸層 /散逸层 (sànyìcéng)the uppermost layer of a planet's atmosphere
  • 外氣層 /外气层 (wàiqìcéng)the uppermost layer of a planet's atmosphere
Czech exosféra
  • exosférathe uppermost layer of a planet's atmosphere
Danish exosfære
  • exosfærethe uppermost layer of a planet's atmosphere
Dutch exosfeer
  • exosfeerthe uppermost layer of a planet's atmosphere
Esperanto eksosfero
  • eksosferothe uppermost layer of a planet's atmosphere
Estonian eksosfäär
  • eksosfäärthe uppermost layer of a planet's atmosphere
Finnish eksosfääri
  • eksosfäärithe uppermost layer of a planet's atmosphere
French exosphère
  • exosphèrethe uppermost layer of a planet's atmosphere
German Exosphäre
  • Exosphärethe uppermost layer of a planet's atmosphere
Greek εξώσφαιρα
  • εξώσφαιρα (exósfaira)the uppermost layer of a planet's atmosphere
Hungarian exoszféra
  • exoszférathe uppermost layer of a planet's atmosphere
Icelandic úthvolf
  • úthvolfthe uppermost layer of a planet's atmosphere
Indonesian eksosfer
  • eksosferthe uppermost layer of a planet's atmosphere
Irish eisisféar
  • eisisféarthe uppermost layer of a planet's atmosphere
Italian esosfera
  • esosferathe uppermost layer of a planet's atmosphere
Japanese 外気圏
  • 外気圏 (gaikiken)the uppermost layer of a planet's atmosphere
Latvian eksosfēra
  • eksosfērathe uppermost layer of a planet's atmosphere
Lithuanian egzosfera
  • egzosferathe uppermost layer of a planet's atmosphere
Malay eksosfera
  • eksosferathe uppermost layer of a planet's atmosphere
Norwegian Bokmål eksosfære
  • eksosfærethe uppermost layer of a planet's atmosphere
Persian اگزوسفر
  • اگزوسفر (egzosfer)the uppermost layer of a planet's atmosphere
Polish egzosfera
  • egzosferathe uppermost layer of a planet's atmosphere
Portuguese exosfera
  • exosferathe uppermost layer of a planet's atmosphere
Romanian exosferă
  • exosferăthe uppermost layer of a planet's atmosphere
Russian экзосфе́ра
  • экзосфе́ра (ekzosféra)the uppermost layer of a planet's atmosphere
Slovak exosféra
  • exosférathe uppermost layer of a planet's atmosphere
Spanish exosfera
  • exosferathe uppermost layer of a planet's atmosphere
Swedish exosfär
  • exosfärthe uppermost layer of a planet's atmosphere
Turkish ekzosfer
  • ekzosferthe uppermost layer of a planet's atmosphere
Ukrainian екзосфера
  • екзосфера (ekzosfera)the uppermost layer of a planet's atmosphere
Vietnamese tầng ngoài
  • tầng ngoàithe uppermost layer of a planet's atmosphere
Cite this entry
APA

exosphere. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/exosphere

MLA

“exosphere.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/exosphere. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “exosphere,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/exosphere.

Source: exosphere on Wiktionary, CC BY-SA 4.0.