How could someone ground a breathable synthetic atmosphere onto a small asteroid?

Let's say there are billions of asteroids in the galaxy, varying in size from baseballs to hunks of rock almost big enough to be dwarf planets. If someone wanted to set up a habitable location on one of the larger ones (house-sized or bigger), what kind of device and/or materials would be needed to give one of these asteroids a breathable synthetic atmosphere?

Here are some things to note:

• These asteroids will be used for a variety of purposes, ranging from small pawn shops to gigantic shopping malls to apartment complexes to maximum security prisons.
• Faster-than-light travel is used in this universe, allowing people and supplies to be moved across the galaxy in weeks rather than millions of years.
• Atmosphere must be similar to Earth. Earth-like gravity can be left up to handwavium.

posted about 6 years ago

The Weasel Sagas‭

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