Question

What is atmosphere ?

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Answer 1

Explanation:

An atmosphere (Greek: ἀτμός atmos + σφαῖρα sphaira, sphere of vapour) is a layer of gas or layers of gases that envelope a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.[1] A stellar atmosphere is the outer region of a star, which includes the layers above the opaque photosphere; stars of low temperature might have outer atmospheres containing compound molecules.