Accessory to War by Neil deGrasse Tyson and Avis Lang
My non-fiction reading really has little rhyme or reason to it. I pick up books that grab my attention or that I've seen other people love. I have to admit I don't really have a huge interest in space exploration or military history, but Neil deGrasse Tyson is a big name and I've seen a show or two on tv and at a planetarium that he's hosted, which is why I picked up Accessory to War.
At times Accessory to War is just fascinating. For me, that was mostly when it was discussing the history of astrophysics and how its beginnings affected armies and explorers and merchants. I also found the parts about how current countries approach space interesting. It's well-written. It doesn't talk down to those of us who don't know much, but it also wasn't over my head. It was conversational and easy to follow.
Unfortunately, there were other parts that were dry and boring. Lists of treaties...