Introducing Rogue Planets

In Ensign Flandry, Chapter Three, there are indications that a rogue planet will be important later in the novel:

Elwych tells Brechdan that his ship visited Vorida, a rogue in the Betelgeuse sector;

Brechdan is taken aback at the mention of a rogue although he refuses to explain why;

the omniscient narrator then spends a paragraph explaining to the reader that smaller bodies are commoner than larger bodies, therefore that sunless planets are commoner than suns;

to make his point clear, the narrator even addresses the reader directly with an imperative verb:

"Consider:..."
-Poul Anderson, Ensign Flandry IN Anderson, Young Flandry (Riverdale, NY, 2010), pp. 1-192 AT Chapter Three, p. 25.

(I think that the narrator should remain unobtrusive. We should not be made to ask: who is addressing whom?)

None of this would have happened if a rogue planet was not going to play a role later in the novel.

After their conversation, the two Merseians go to a place that I had to google, a gynaeceum.