|What planets have Oxygen in their atmospheres
other than Earth?
|Question Date: 2014-11-24|
Good question! Most of the inner planets
(Mercury, Venus, Earth, Mars) have oxygen in their
atmospheres. Oxygen is actually the most abundant
gas in Mercury’s atmosphere, though Mercury’s
“trace” atmosphere is very thin (less than one
trillionth of the pressure of Earth’s atmosphere;
planets' composition I’ve
included a useful chart from NASA which compares
the pressure and composition of the atmospheres of
the planets in the Solar System.
There are no planets in our solar system with
atmospheres that have more than a tiny amount of
oxygen. Mars may have had some oxygen many
millions of years ago. Also, since there are
millions of planets around other stars, many of
them likely have atmospheres with oxygen, but, we
don't know this for sure. But, the possibilities
are pretty much endless!
Mars has trace amounts of oxygen in its
atmosphere, and may have had more in the past.
This may be evidence for Martian life, but this is
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