Aggressively average and a bit too “in a hurry” to really provide any worthwhile or meaningful discussion for readers that aren’t beginners in astrophysics. I forgot what he said in about a week. That being said, it serves its purpose. It explains basic topics in astrophysics in a way that’s easy-to-follow and a very quick read. It’s a good review; imagine a Sparknotes page but for astrophysics. I don’t regret reading it, but there’s better books out there.