why oxygen is not present in space
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Now, a ground-based experiment has revealed why this life-giving molecule is so rare in the cosmos: because oxygen atoms cling tightly to stardust, preventing them from joining together to form oxygen molecules. The discovery should yield insight into the chemical conditions that prevail when stars and planets arise.
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On Earth, gravity holds things to the Earth. For example, if you jump up, you come down because gravity pulls you back. It is the same with gases like oxygen, they can’t get very far from the Earth because gravity pulls them back.
On planets or moons that have very low gravity, gases can escape and enter space. But space is so big, that whatever gases are found in space, gases spread out so fast, that they are so far apart from each other that we say there is no gas in space. What I really mean is that there is so little gas in space, not enough for us to use to breathe.
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