I thought I had this already enabled, but no, it wasn’t–so now you have the option of selecting RSS feeds to get some bits of space-related knowledge. You have the options of posts, comments, or both. Just look in the columns on the right for “TMSB–Nuggets o’ space knowledge.”
But more importantly, I’ve added a link to Gunter’s Space Page. It’s under “Fun Ways to Learn Space Operations.” I don’t know if the page is “fun” in the child’s sense of the word. It’s fun in the nerdy sense. So go there–he’s got some great spacecraft and launch information.