Me neither, sort of the same thing as Game of Thrones, had no idea there were books, hadn't ever even heard of Martin, untilt he previews started coming in early 2011 for GoT on HBO. There are 2 writers for the expanse, one writes one group of characters, one writes another, and they'll swap from time to time, using the same POV structure that Martin uses in Song of Ice/Fire. They have stated in posts that they have many more books mapped out, and there is a lot of great material already, so it's a great series to get into in terms of longevity.