why oxygen is not present in space
Answers
Well, technically there is. Earth floats in space, and has an atmosphere with oxygen in it. Therefore: oxygen in space.
But I know the question you’re asking.
First, there are random pockets of gases, including oxygen, floating around in space. But why is all of space not filled with oxygen? Firstly, not nearly enough oxygen, or matter in general, for that to even be possible. Not just implausible: literally impossible.
But the real reason there is so much on Earth and so little in space is gravity. Matter pulls other matter to it through gravitation. The more matter/mass, the ‘stronger’ the pull. For this reason, most matter ends up in clumps eventually. Other forces are at work that keep everything from immediately falling into a single ‘ball’ of matter in the universe, such as the universe’s expansion and inertia. So most ‘matter’ clumps together, but there is definitely still free-floating stuff out in the vastness of space. Somewhere in the universe it’s possible there is even a huge ‘cloud’ in space of breathable air. That’s not impossible. Probably not even implausible. Would be cool, yes? Unfortunately, even then you’d probably be unable to breathe it like on Earth.