An atmosphere is a layer of gas that surrounds some planets, moons, and other celestial bodies. Earth's atmosphere contains oxygen, which is vital to life here. The atmosphere also helps protect Earth from the Sun's harmful rays.

About Atmosphere

An atmosphere (New Latin atmosphaera, created in the 17th century from Greek [atmos] 'vapor' and [sphaira] 'sphere') is a layer of gases that may surround a material body of sufficient mass, and that is held in place by the gravity of the body. An atmosphere may be retained for a longer duration, if the gravity is high and the atmosphere's temperature is low. Some planets consist mainly of various gases, but only their outer layer is their atmosphere.

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