Darling sets out to write the history of the universe from start to finish, in which man among that history is but a blip. Even so, man does ends up with a much larger role that perhaps time itself warrants, because, after all, we are the ones reading and writing and theorizing this history.
We start with the big bang, an event for which there seems no logical first cause. The next several chapters then focus on one particle, as it comes into being and as it works its way around this fledgling universe. Darling points out how much happens in those first few seconds but how, in a sense, because of that, time really is different at this point, wherein things are so condensed.
Darling does his best to keep things simple. Unfortunately, writing about such a wide span of time in such a short work means that there's a certain glossiness to the whole, a blurriness, such that at times I found my attention waining. It didn't help that I read the work online as an ebook. I think reading in print, taking a bit more time and being a bit more comfortable, would have made the reading experience better and thus the book better.
Although Darling admits that the universe would seem to need some sort of physical law for the components to work as they do--for positive and negative to exist and attract one another--he mostly keeps to a naturalistic view of everything. When we finally get to Earth and the formation of life, we are given the story of the primordial soup from which life springs. And then, for a heartbeat, we see man emerge.
After man's emergence, Darling spends most of the rest of the book talking about the spaceship Voyager, as it wanders out of the galaxy and into the wide universe. What happens to it as the years pass and as the universe itself continues to expand. Eventually, the stars start to go out. A few black holes swallow up vast swaths of the universe, but still other parts continue to wander aimlessly, cut loose from their suns and centers, until they too fall apart and return to their particulate state.
Another option, the one now less popular, Darling also explores, that the universe is not ever expanding, that it is limited, like a balloon, and so at some point begins to contract. This idea gets shorter attention.
Darling ends with a pull toward Eastern philosophy, but with a Western slant. He hypothesizes how many himself could change the universe, especially insofar as the observer is never really separate from what is observed. We are part of the universe itself. Our mind is the universal mind. It seems a happy note to go out on, even if the picture of dead stars wandering and disintegrating add infinitum is a rather dreary future to look out upon.