Essentially a history of war, told through the lense of astrophysical scientific breakthroughs. As others have noted, the first couple chapters are through thoroughly engaging but then Tyson and Lang step into a long narrative of the history of war. Such history overviews can be done well or poorly, depending on the organization of the book and I felt that this one fell short. It was difficult to know, at any given point in the book, how what I was reading related to the overall narrative.

That said, lots of interesting stuff and deep thought starters in this book.