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The ability of a large moon such as Titan to subsequently retain a substantial atmosphere for billions of years depends on a delicate balance between surface gravity, atmospheric molecular mass, and solar heating.
It is the only moon in the solar system with substantial atmosphere.
Titan is the only moon with a substantial atmosphere; the main constituent of it is nitrogen, as is Earth's.
At a diameter of 3,200 miles, it is larger than the planet Mercury, and is the only moon in the solar system with a substantial atmosphere.
Observing subtle optical effects when the starlight passed the edge of Charon, researchers said the moon showed no evidence of a substantial atmosphere.
She was anxious to see Titan, which is said to be the only moon in the solar system with a substantial atmosphere.
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All of the Solar System planets except Mercury have substantial atmospheres as their large masses mean gravity is strong enough to keep gases close to the surface.
Rayleigh scattering is modulated by the thickness of the atmospheric column and may be difficult to determine, as some atmospheric and surface absorbing species can mask the presence of Rayleigh scattering even for planets with substantial atmospheres (Crow et al., 2010).
Taken together with the isotopic fractionations in N, C, H, and O measured by SAM, these results imply a substantial loss of atmosphere from Mars in the posthydrodynamic escape phase.
Three of the four inner planets (Venus, Earth and Mars) have atmospheres substantial enough to generate weather; all have impact craters and tectonic surface features, such as rift valleys and volcanoes.
Stand in the middle and you could be on the Red Planet – were it not for the breathable atmosphere and substantial gravity.
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