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The moon, absolutely devoid of a magnetic field, no atmosphere. Mars, nearly no magnetic field, nearly no atmosphere. Jupiter, massive, huge magnetic field, extremely dense atmosphere. Saturn, ditto, Neptune, Your fucking asshole, ditto. Mercury supposedly has a magnetic field, but it's really close to the sun, maybe it does have an atmosphere, who knows. The sun, astronomical magnetic field, atmosphere to match, check. Earth, moderately strong magnetic field, moderately dense atmosphere, so far so good. Venus? It's less dense, but what it lacks in density, it makes up for in volume. Where Earth's field is Apple shaped, Venus is more voluminous and shaped like a comet with its tail. It too has an atmosphere.

Is gravity and the magnetic field of a celestial body related? After all, either could be used to explain the atmospheres of these bodies.