Are worldbuilding-style questions which boil down to "is this n-body system I've invented stable" on-topic for this site?
As examples I am talking about things like
- Is this a potential planetary setup for the Alpha Centauri System?
- Is a Procyon - brown dwarf - Jupiter - superearth - Mars - Pluto system theoretically possible?
Since these questions are in general unanswerable in a definitive fashion, should they be allowed?