"[Our philosopher] asserted that he knew the whole secret...[H]e surveyed the two celestial strangers from top to toe, and mantained to their faces that their persons, their worlds, their suns and their stars, were created solely for the use of man. At this assertion our two travelers let themselves fall against each other, seized with a fit of...inextinguishable laughter"
-- Voltaire (1752)
Hello all. My name is Lu. This is a science blog, on a microscopic and astronomical scale (and a combination of both--extraterrestrials!). I'm biology student, pretty much in love with the universe.
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Yes, other planets have oxygen.
Here is the amount of oxygen in the atmospheres of the 8 planets:
Now, Mercury has a very high atmospheric content of oxygen, but its atmosphere is VERY thin. While the Earth’s atmosphere at sea level is 1 bar, the trace atmosphere on Mercury is 0.00000000000001 bars (1x10^-13 bars). Not enough for the capacity of the human lungs.
One of the reason why atmospheric oxygen is in such a trace amount is that there are very little natural inorganic reactions that can produce free oxygen. Because it’s highly reactive, oxygen tend to exist with other elements. Most of the oxygen on our planet is considered to be attributed to the process of photosynthesis, which is absent on the other planets as it requires the existence of life.
Source: Planetary Atmospheres