Last Updated：2025/11/20

Dictionary quizzes to help you remember vocabulary

Dictionary quizzes to help you remember vocabulary

the uppermost layer of a planet's atmosphere / an extremely thin atmosphere, as on Saturn's moon Dione

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exosphere

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Source Word

exosphere

the uppermost layer of a planet's atmosphere / an extremely thin atmosphere, as on Saturn's moon Dione

Japanese Meaning

惑星の大気の最上層。 / サターンの月ダイオンのような、非常に希薄な大気。

What is this buttons?

Although the exosphere is extremely thin, hydrogen atoms can still escape into space from it.

Google Translation / DeepL Translation

外気圏は非常に希薄ですが、そこから水素原子が宇宙へと逃げ出すことがあります。

Sense（1）

the uppermost layer of a planet's atmosphere

Sense（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)

Google Translation / DeepL Translation

exospheres

（ plural ）

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