The atmosphere is the layer of gases surrounding a planet, especially the air around Earth; it can also mean the mood or feeling of a place.
It comes from Greek *atmos* 'vapor' and *sphaira* 'sphere', literally 'vapor sphere'. Scientists adopted it to describe the gas shell around Earth and later around other planets.
Earth’s atmosphere is incredibly thin compared to the size of the planet—like a coat of paint on a giant ball—yet it makes life possible. The second meaning, 'mood', is clever: just as air surrounds your body, a place’s emotional 'air' surrounds your mind.
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