He doesn't know what she was [a girl, a star, his salvation, absolute destruction], nor does he know where she came from [the skies, the vast unknown, the darkest corners of the universe — of heaven, of hell]. Her arrival was an explosion of everything huge and grand and painfully beautiful.

[Later, he'll learn that her departure would be everything but.]

Twinkle, twinkle, little star; how I wonder what you are.