An atmosphere (from Greek ατμός - atmos, 'vapor' + σφαίρα - sphaira, 'sphere') is a layer of gases that may surround a
material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if 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.

The term stellar atmosphere describes the outer region of a star, and typically includes the portion starting from the
opaque photosphere outwards. Relatively low-temperature stars may form compound molecules in their outer
atmosphere. Earth's atmosphere, which contains oxygen used by most organisms for respiration and carbon dioxide
used by plants, algae and cyanobacteria for photosynthesis, also protects living organisms from genetic damage by
solar ultraviolet radiation. Its current composition is the product of billions of years of biochemical modification of the
paleoatmosphere by living organisms.


Source: Wikipedia
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