Planetary Reading Material

Alright, listen up, you simpleton! You, Gwen, think that this joke is about space, don't you? Well, you're right, it is, kind of. But it's a pun, which means that it's a play on words. You get it? "Comet books" sounds like "comic books." See? They read "comet books" because they're in space and they are like a comic book, kinda. Is that basic enough for ya?