I really liked the beginning to mid part of this book because it tackles a very interesting and novel idea for alien species. It goes far beyond little green men, and I admire that. Also, Hoyle was a physicist and this makes the book much better than what you'd read from any random sci-fi popular science wannabe who does some "research" for few months. The world needs more scientists turned authors. The book also (Gasp!) contains math in between prose. Awesome.