Source: Gatley, R. (2018, January 27). Cruising at 47000 feet over Kazakhstan. Shot with an 8mm fisheye lens.. unsplash. https://unsplash.com/photos/oxgK2f_rxDc
Definition:
The mass of gas that surrounds an astronomical body, such as a planet, and is held in place by the gravity of this body.
Etymology:
From Greek ατμός (atmos)'vapor' + σφαιρα (sphaira)'sphere'
