A very good primer for those interested in astronomy. Waller does a great job explaining the concepts and even some of the mathematical equations used for basic astronomy. The book is laid out in a manner where you build towards more complex topics, making sure you know whats going on. I also greatly appreciated how he treats the topics like a scientist, stating how ideas such as dark matter and energy and even black holes are as of now the best way of explaining phenomena, but could very well be proven incorrect (most likely won't but skepticism is important in science!). His love of science bleeds through, and the figures and graphs are super helpful. I'd recommend to anyone refreshing or learning anew.