How does the atmosphere of this spaceship work if my brain doesn't?

I want to have air and STP (standard temperature and pressure) around my spaceship.

Other properties:

1. Objects can enter and exit it without bumping into any kind of a barrier? In fact, there doesn't seem to be anything between the air and the vacuum of space.
2. The barrier, or whatever that keeps the air in there, is resilient to damage and malfunction.
3. It consumes the least amount of power.

How can I have essentially a miniature atmosphere around my spaceship?

Note: Pretty much all comments and the answer are out-of-context now, thanks to my editing, just to clear up any confusion.

posted over 5 years ago

Mephistopheles‭

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