That Leviathan, Whom Thou Hast Made
by Eric James Stone
"That Leviathan, Whom Thou Hast Made" won the 2010 Nebula Award for Best Novelette and was nominated for the Hugo Award in the same category.
Harry Malan is the president of a Mormon branch on Sol Central Station, where humans can interact with "swales" -- giant star-dwelling plasma beings. When a Mormon swale asks for help, Harry ends up confronting Leviathan, the largest of the swales.