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Find yourself in space without an oxygen tank? Not a problem! Breathing in the vacuum of space is just as easy as breathing on Earth, especially if you are a superhero or somehow able to leave the atmosphere under your own power.
Basically the characters in the story can breathe, speak, and generally not die while strolling or freefalling in space without wearing anything other than their clothes.
They can also roll down a window and sticks their heads out to get a better look at something in the middle of space.
This could be because of nanomachine enhancements or They have the ability to use Anaerobic respiration. Resisting vacuum pressures and radiation is a result of being strong enough to resist them from training or exposure to it, either that or energy manipulation to create an environment for resistance.
It's possible that some of these sequences take place in the outer atmosphere where some oxygen would still be present.
In Real Life, people can theoretically survive in space for a few moments, given medical assistance afterwards. It is recommended to not hold your breath, as the internal pressure will cause your lungs to rupture.
It should also be noted that the Milky Way does have an extremely thin "atmosphere," held in place by the gravity of all the stars in the galaxy, but it's far too thin to do a living Earth creature any good.
What do you think of this?