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than other wavelengths, giving the Earth a blue halo when seen from
space]]
The Earth's atmosphere (or air) is a layer of gases surrounding the planet
Earth that is retained by the Earth's gravity. Dry air contains roughly (by
volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide,
and trace amounts of other gases. Air also contains a variable amount of
water vapor, on average around 1%. The atmosphere protects life on Earth by
absorbing ultraviolet solar radiation, warming the surface through heat
retention (greenhouse effect), and reducing temperature extremes between
day and night.
There is no definite boundary between the atmosphere and outer space. It
slowly becomes thinner and fades into space. An altitude of marks the
boundary where atmospheric effects become noticeable during reentry. The
Kármán line, at , is also frequently regarded as the boundary between
atmosphere and outer space. Th
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