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If a star system has planets, the availability of oxygen on a given planet is a complicated process. If the planet is of the correct size and in the ecosphere of the star, the production of oxygen will occur through the existence of plant life that will convert carbon dioxide into oxygen. In a primordial planet like an earth, oxygen is not going to be an element that is naturally occurring. The compound carbon dioxide is. It takes plant life to produce an atmoshpere that will sustain animal life.

The odds of this happening in a given star system are low, but possible.

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Q: What other Planets in Our Galaxy have enough Oxygen to Sustain Human Life?
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Why would we suffocate on the outer planets?

The outer planets does not have enough oxygen to sustain life, or they don't have an atmosphere at all.


Why can't Mars sustain life?

There is not enough oxygen on Mars. Also, it is extremely cold.


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Is there oxygen on Haumea?

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Why doesn't the moon have enough oxygen?

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