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Mercury has virtually no atmosphere. Planet with thinnest

Venus has a extremely dense atmosphere of mostly sulphur compared to Earth. Planet with densest.

Earth has a moderately dense atmosphere of nearly 3 quarters nitrogen and oxygen. Planet with 2nd from densest.

Mars has a thin atmosphere of mostly carbon and some oxygen. Planet with 2nd thinnest.

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How do the sizes of the four inner planets compare?

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Of the inner four terrestrial planets in our solar system - Mercury, Venus, Earth and Mars - Mercury has almost no atmosphere.


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