What is the major atmospheric component of Mars and Venus?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Both Mars and Venus have atmospheres dominated by carbon dioxide (CO₂), comprising over 95% of each planet's atmospheric composition. Despite this similarity, the two planets have vastly different atmospheric conditions. Venus has an extremely dense atmosphere with surface pressures 90 times greater than Earth's, creating a runaway greenhouse effect with surface temperatures exceeding 450°C (850°F). Mars, conversely, has a very thin atmosphere with surface pressure less than 1% of Earth's, making it unable to retain heat or liquid water on its surface. This comparison highlights why Earth's unique atmospheric composition—with 78% nitrogen and 21% oxygen—is so remarkable and essential for supporting life as we know it.
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