galactography · noun1
From galacto- (“milk-related”) + -graphy (“something written or represented”). Circa 1930s.
galactography · noun2
Either galactic + -graphy or blend of galactic + geography. Coined by American science fiction author Isaac Asimov in 1950 in the final installment of the novella "...And Now You Don't" (collected as part of Second Foundation).
Etymology from Wiktionary, CC BY-SA 4.0.