Well bits of the universe do have oxygen, like the oxygen in our atmosphere. But perhaps you mean why is there no oxygen in space?
There is a lot of oxygen around the Earth because Earth’s gravity pulls it in towards the planet and keeps it there. There is some oxygen in space but it is really really spread out and so there is not enough of it in one place for us to breathe in space. It is also not very commonly found in its molecule form (O2) which is the form we breathe but instead is found combined into other molecules.
I guess too much oxygen would be too much, because it would lead to excessive oxidation of everything on earth, which effectively means burning of everything…?
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