Cosmology

A Brief History of Time Stephen Hawking, 1988 Executive Summary The book that sold millions of copies and was finished by almost none of its buyers is not, in the end, a book about the universe. It is a book about a boundary: what it means to reach the limit of a thing that contains you. Every chapter sets one up, and every one dissolves it. Hawking’s thesis is that space and time have no far side we could ever reach. A black hole’s horizon is not a surface you bump into but a line past which signals cannot come back. The Big Bang is not a place where something was switched on but the moment the laws break down, at which point “before” stops being a word with a referent. The book’s deepest move, developed in the eighth chapter, is stated in a sentence he liked well enough to repeat: “One could say: ‘The boundary condition of the universe is that it has no boundary.’” ...

The Grand Design Stephen Hawking and Leonard Mlodinow, 2010 Executive Summary Twenty-two years after A Brief History of Time ended by asking what place there is for a creator, Hawking returned with a co-author and a verdict. The Grand Design is no longer than the first book and carries much less argument per page. It is also far more confident, and the confidence is the subject of this review. Its claim is that the universe explains itself: the laws do not need to be set, only to be possible, and once they are possible a universe of our kind will happen. ...

Astrophysics for People in a Hurry Neil deGrasse Tyson, 2017 Executive Summary Neil deGrasse Tyson assembled this book from a series of essays written for Natural History magazine, and it reads that way, in the best sense. Each chapter is a self-contained sprint through a major concept: the Big Bang, dark matter, dark energy, the cosmic microwave background, the periodic table’s stellar origins. The whole thing takes about two hours to read. The thesis is modest and genuine: you do not need a physics degree to grasp the shape of the universe, and knowing that shape changes how you see everything else. Tyson is the most effective science communicator of his generation, and this small book is a fair demonstration of why. ...

Cosmos Carl Sagan, 1980 Executive Summary Cosmos began as a television series and became something larger: the most widely read science book of the twentieth century, and the one that most fully expresses Sagan’s vision of what science is for. It is not a textbook. It is an argument: for curiosity, for humility, for the idea that the universe is not a backdrop to human drama but the context in which human drama takes its only possible meaning. Thirteen chapters move from the shores of the cosmic ocean to the origin of life, from the Library of Alexandria to the Drake equation, from the evolution of the human brain to the existential risk of nuclear war. The thesis: we are a way for the cosmos to know itself, and that knowledge carries an obligation — to the truth, to each other, and to the fragile planet that made us possible. ...

Pale Blue Dot: A Vision of the Human Future in Space Carl Sagan, 1994 Executive Summary In 1990, at Sagan’s request, NASA turned the Voyager 1 spacecraft around as it left the solar system and took a photograph of Earth from a distance of 3.7 billion miles. Earth appeared as a fraction of a pixel, a pale blue dot suspended in a ray of sunlight. Pale Blue Dot is the book Sagan wrote from that image: part meditation on human smallness, part argument for space exploration, part plea for planetary responsibility. It is his most personal book and, in some ways, his most honest. The thesis: that photograph is the most important mirror humanity has ever held up to itself, and what it shows (our insignificance, our isolation, our shared fragility) is not a reason for despair but for responsibility. ...