So the antagonist for the second arc of her book is a Sorceress who created her Organization's impossible space base by inverting a falling star. Additionally she states the Organization's defenses and magic is fueled by this Star.
Now, I initially didn't put much significant thought into this since falling star is a colloquialism for meteors, meteorites, and asteroids.
However while doing a reread of the series I came across this observation.
Liminal remarks on the star having Hydrostatic Equilibrium. This means that the celestial body being referenced at minimum must actually be a genuine planetoidor larger as Hydrostatic Equilibrium is what distinguishes Dwarf Planets from smaller celestial bodies such as Asteroids and Centaurs.
All of this matters because Magik then uses the entire star to fuel one of her spells in the finale.
Source on Hydrostatic Equilibrium