Why is there an atmosphere oround earth while many planets don't have?
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Due to its small size (and thus its small gravity), Mercury has no substantial atmosphere. Its extremely thin atmosphere mostly consists of a small amount of helium and traces of sodium, potassium, and oxygen. These gases derive from the solar wind, radioactive decay, meteor impacts, and breakdown of Mercury's crust.
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sangitamishra471:
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whether or not a planet retains an atmosphere over geologic time depends on the mass of the planet, the radius of planet, the temperature of the atmosphere and the composition of the atmosphere.
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