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Minimizing the Side Effects of Breathable Outer-Space

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There exists a Universe in which all of outer-space is filled with some form of human-breathable air. Theoretically, you could fly a Zeppelin up there and explore other worlds, with a sufficiently long travel time.

Nearly everything about physics, except for maybe some minor differences, are the same as in your universe, though. How can this be?

My question, then, to the scientists of this Universe:

What is/are the least intrusive physical law(s) that would need to change in order for Humans to be able to breathe in outer-space?

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This has been done in a smaller scale in The Integral Trees (1984) by Larry Niven

The story occurs around the fictional neutron star Levoy's Star (abbreviated "Voy"). The gas giant Goldblatt's World (abbreviated "Gold") orbits this star just outside its Roche limit and therefore its gravity is insufficient to keep its atmosphere, which is pulled loose into an independent orbit around Voy and forms a ring that is known as a gas torus. The gas torus is huge"”one million kilometers thick"”but most of it is too thin to be habitable. The central part of the Gas Torus, where the air is thicker, is known as the Smoke Ring. The Smoke Ring supports a wide variety of life.

No "ground" exists in the Smoke Ring; it consists entirely of sky. Furthermore, the Smoke Ring is in orbit and therefore in free fall: there is no "up" or "down". Most animals have trilateral symmetry that allows them to see in all directions. The majority of Smoke Ring animals have evolved to fly on at least an occasional basis"”even the fish. The Smoke Ring contains numerous "ponds," globs of water of various sizes which float free like everything else. While there are aquatic and amphibious animals in the Smoke Ring that live the majority of their lives in such ponds, these animals may find their habitat unsuitable at any moment. Whether their home pond drifts too far out of the habitable center of the Smoke Ring and into the gas torus, becomes too large and breaks up due to tidal forces, or impacts a large object such as an integral tree, aquatic animals must be able to propel themselves through the air sometimes in order to find a new place to live.

Use the same gas torus, but make your humans smaller, which makes the gas torus "universe" bigger

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