noun🔗Share外気圏The uppermost layer of a planet's atmosphere"Satellites orbit Earth within the exosphere, where the air is extremely thin. "人工衛星は、空気が極めて薄い外気圏内で地球を周回しています。spaceastronomyenvironmentscienceweatherChat with AIVocabulary GamePractice Reading
noun🔗Share外気圏An extremely thin atmosphere, as on Saturn's moon Dione"Because Saturn's moon Dione has such a weak and thin atmosphere, scientists classify it as an exosphere. "土星の衛星ディオネは非常に弱く薄い大気を持っているため、科学者たちはそれを外気圏と分類しています。astronomyspacescienceenvironmentChat with AIVocabulary GamePractice Reading
