Do you know anything about the galaxy, space, stars, asteroids, planets or books? No? Then buy this one. It will tell you everything you ever wanted know about the subject (well, alright, not everything, but close enough) and you will probably actually remember it - unlike reading a textbook. I bought this book about three years ago, and I really can't count how many times I've read it. Impress everyone you meet with the expert knowledge and witty humour you will (probably) accumulate during reading this.
And by the way, if the answer to the above question was "yes", then I formally challenge you to see if you knew every single thing mentioned in this book before you read it. If you've already read it, of course, that's cheating.