Composition Atmospheric gases scatter blue light more than other wavelengths, giving the Earth a blue halo when seen from space . Initial atmospheric makeup is generally related to the chemistry and temperature of the local solar nebula during planetary formation and the subsequent escape of interior gases. These original atmospheres underwent much evolution over time, with the varying properties of each planet resulting in very different outcomes. The atmospheres of the planets Venus and Mars are primarily composed of carbon dioxide , with small quantities of nitrogen , argon , oxygen and traces of other gases. The atmospheric composition on Earth is largely governed by the by-products of the very life that it sustains. Earth's atmosphere contains roughly (by molar content/volume) 78.08% nitrogen, 20.95% oxygen, a variable amount (average around 1.247%, National Center for Atmospheric Research) water vapor, 0.93% argon, 0.038% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases. The low temperatures and higher gravity of the
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