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Book Summary and Reviews of Time's Second Arrow by Robert M. Hazen

Time's Second Arrow by Robert M. Hazen

Time's Second Arrow

Evolution, Order, and a New Law of Nature

by Robert M. Hazen

  • Published:
  • Feb 2026, 192 pages
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About this book

Book Summary

A distinguished geoscientist and rising-star astrobiologist offer a stunning new theory upending 150 years of established science―and an inspiring new vision of our universe.

Of the codified laws of nature, famously, only one inscribes a direction to time: the dreaded second law of thermodynamics, which declares that the disorder of a closed system tends to increase as time passes. New shoes eventually scuff, our bodies weaken and die. Yet our senses tell us that miraculous order constantly emerges, too: children grow and learn; spontaneous patterns manifest in murmurations of starlings. Can it be true that the laws of our universe mandate only dissolution―rendering the intricate order of a butterfly's wing, the much-vaunted complexity of the human brain, merely incidental?

In Time's Second Arrow, star scientists Robert M. Hazen and Michael L. Wong overturn more than a century of scientific canon, arguing that, in fact, there must be a second "arrow of time"―a heretofore missing law of nature that explains how the marvelously complex constituents of our universe came to be. Evolution, they boldly propose, is a universal phenomenon―not only in biology, but in the entire atomic, chemical, mineral, and physical universe. Showing how a natural process of selection for increasing function has shaped the universe since its inception, they explore how this new law could possibly help us identify life on other planets and―perhaps―even understand the purpose and meaning of life on Earth in a new way.

Elegantly written and deeply moving, Time's Second Arrow reveals how our cosmic inheritance includes, even alongside loss and decay, a drive toward wondrous invention and progress―ultimately revising our understanding of the universe and our place within it.

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Reviews

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"A paradigm-shifting work of scientific daring that inspires us to reconsider the emergence of life in the cosmos … [T]here are times when the facts alone exert their own poetry. When this happens in a science book, it can be transcendent." ―Kirkus Reviews (starred review)

"Time's Second Arrow…present[s] an audacious hypothesis: that the increasing complexity observable in the history of life, the universe, and everything reflects a fundamental, hitherto unrecognized law of nature…A laudably concise, compelling account of how everything around us came to be." ―Andrew H. Knoll, author of A Brief History of Earth

"Time's Second Arrow is bubbling with ideas, all inspired by one of the biggest outstanding questions in science: the origin and evolution of complexity... . The insights here help to move us toward a unified understanding of the physical and biological realms." ―Sean Carroll, New York Times best-selling author of The Biggest Ideas in the Universe

This information about Time's Second Arrow was first featured in "The BookBrowse Review" - BookBrowse's membership magazine, and in our weekly "Publishing This Week" newsletter. Publication information is for the USA, and (unless stated otherwise) represents the first print edition. The reviews are necessarily limited to those that were available to us ahead of publication. If you are the publisher or author and feel that they do not properly reflect the range of media opinion now available, send us a message with the mainstream reviews that you would like to see added.

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Author Information

Robert M. Hazen

Robert M. Hazen, a geoscientist at the Carnegie Institution for Science, is the author of Symphony in C, among other titles. He lives in Bethesda, Maryland.

Michael L. Wong is a planetary scientist and astrobiologist at the Carnegie Institution for Science. He lives in Washington, DC.

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