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I would say Mercury and Mars, even though Mars does have an extremely thin atmosphere. Pluto doesn't have an atmosphere, but it also is no longer officially considered to be a planet.

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15y ago
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5mo ago

The two planets in our solar system with little to no atmosphere are Mercury and Mars. Both planets have extremely thin atmospheres compared to Earth, with Mercury's atmosphere consisting mainly of oxygen, sodium, hydrogen, helium, and potassium, and Mars' atmosphere comprised primarily of carbon dioxide.

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Q: What are the two planets in the solar system with no atmosphere?
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