The aim of this paper is to discuss the composition of Johanna Sinisalo’s novel The Core of the Sun by demonstrating how the author used excerpts of academic text to create the literary world of the novel. As the theoretical foundation, I will use Lubomír Doležel’s research introducing the theory of possible worlds in literary creation. The realia, possibilia, and the transworld identity of the fictional world of Sinisalo’s novel is analyzed on the basis of excerpts from dictionary entries and scientific articles used as world-building elements.