How can a small planetoid hold an atmosphere under artificial means?

Edit: Before I give up on this I wonder how could an advanced civilization create conditions on a small planetoid (Ceres sized?) to keep an Earth level breathable atmosphere? It seems like its impossible in nature, but what about artificially? Some handwavium is allowed of course.

Edit: I previously wrote "within" a small planetoid. Apologies. I meant ON a small planetoid.

Original question: How can small planetoids (Charon, Ceres, Dysnomia sized[?]) have, and keep, an atmosphere with breathable gases for any kind of extended period of time?

I realize that their gravity is low and that might be a reason why it couldn't, but are there any conditions under which they could? For example(s):

• Could it be releasing gases of its own from within its core?
• Could the core have a tiny bit of Neutronium in it (don't laugh)?
• Could a comet have hit it and given it the gases?

I am looking for an answer that would exist in nature, but am open to artificial means as well. Thanks.

posted almost 7 years ago

Len‭

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