Though there's a sense of the word "dark" that means it's unseen or that we are ignorant of it. Like "to leave someone in the dark", to "go dark" in communication, or a "dark match" in pro-wrestling (it happens but isn't broadcast and doesn't effect storylines).

Might be too much to hope for, but he could just mean it's always dark to us.

I'm getting of a kick out of this Trone calling it the "backside of a moon" and chewing on his glasses. Ain't no nerd. Tell me wut these Chinese is doing on the backside of the moon and leave the spacey mumbo jumbo out of it.