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Secondary atmosphere
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Secondary_atmosphere".
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. Secondary atmospheres are relatively thin when compared to primary atmospheres like the one found on Jupiter.
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