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Mercury is the planet in our solar system that has virtually no atmosphere. Its thin exosphere is composed of trace amounts of gases like helium and neon.
Titan, a moon of Saturn, is the largest satellite in the solar system and has a substantial atmosphere. It is the only moon in the solar system known to have a dense atmosphere, composed mostly of nitrogen with traces of methane and ethane.
But ... there are many bodies in our Solar system that have no atmosphere.
Venus has the thickest atmosphere among the planets in our solar system. Its atmosphere is composed mainly of carbon dioxide and thick clouds of sulfuric acid, creating intense pressure and trapping heat to create a runaway greenhouse effect.
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