What is an atmosphere? An atmosphere is a layer of gas that surrounds a world
Atmosphere of Terrestrial worlds Atmospheres on Terrestrial planets are more varied than their geology •Moon and Mercury has no atmosphere but Venus, Earth and Mars do Atmospheres play a major role in defining planetary geology •Venus, Earth and Mars are essentially at the same distance from the Sun, but Venus is very hot, Earth is temperate and Mars is dry, barren and cold
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