Secondary atmosphere
From Wikipedia, the free encyclopedia
A secondary atmosphere is an atmosphere of a planet that did not form by accretion during the formation of the planet's sun.
A secondary atmosphere instead forms from internal volcanic activity, or by accumulation of material from comet impacts.
Earth has a secondary atmosphere. It is characteristic of terrestrial planets, such as Mercury, Venus and Mars, also have secondary atmospheres. Secondary atmospheres are relatively thin when compared to primary atmospheres like the one found on Jupiter.
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