noun🔗ShareThe uppermost layer of a planet's atmosphere"Satellites orbit Earth within the exosphere, where the air is extremely thin. "spaceastronomyenvironmentscienceweatherChat with AIVocabulary GamePractice Reading
noun🔗ShareAn 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. "astronomyspacescienceenvironmentChat with AIVocabulary GamePractice Reading
