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What are the two main causes for the existence of atmospheres on the terrestrial planets?
Wiki User
∙ 11y ago
One main reason is the gravity a dense object like a terrestial planet has. As gravity depends on the density of a object and a rocky planet has much density...our earth is the densest object in the solar system but Jupiter's gravity is more as gravity depends upon size too. The gravity holds the gases forming the atmosphere.
Another reason is the core which has a magnetic effect and forms a magnetic layer which has some effect on the atmospheric gases and saves it from going away to the space by attracting the gases towards the pole where the gravity is the highest.
Wiki User
∙ 11y ago
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