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Planetary Atmospheres
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Mercury
Extremely thin, contains oxygen (O2), sodium (Na), hydrogen (H2), helium (He), and potassium (K)
Mars
95.3% carbon dioxide (CO2), 2.7% nitrogen (N2), 1.6% argon (Ar), and traces of oxygen (O2), water (H2O), and methane (CH4)
Earth
78% nitrogen (N2), 21% oxygen (O2), 0.93% argon (Ar), 0.04% carbon dioxide (CO2), and trace amounts of other gases
Venus
96.5% carbon dioxide (CO2), 3.5% nitrogen (N2), with traces of sulfur dioxide (SO2), argon (Ar), water (H2O), and others
Saturn
96% hydrogen (H2), 3% helium (He), and traces of methane (CH4), ammonia (NH3), hydrogen deuteride (HD), and ethane (C2H6)
Jupiter
Approximately 90% hydrogen (H2) and 10% helium (He) with traces of methane (CH4), water (H2O), ammonia (NH3), and other gases
Uranus
83% hydrogen (H2), 15% helium (He), 2% methane (CH4), and traces of water (H2O) and ammonia (NH3)
Neptune
80% hydrogen (H2), 19% helium (He), 1% methane (CH4), and traces of hydrogen deuteride (HD) and ethane (C2H6)
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