Human societies have been shaped not only by events on Earth but by the unstable behavior of the solar system itself, according to a new book by environmental historian Dagomar Degroot. In «Ripples on the Cosmic Ocean: How the Solar System Shaped Human History – And May Help Save Our Planet,» the Georgetown University associate professor argues that celestial phenomena — from solar storms to comets — have repeatedly influenced human progress in ways that are rarely acknowledged.
Degroot describes the work as an «environmental history» rather than a conventional popular-science book about space. The distinction matters, because the book ranges far beyond astronomy. Its five sections cover the Sun, the Moon, Venus, Mars, and comets and asteroids, tracing how humans have responded to changes in the appearance or understanding of each celestial object. The scope stretches from food prices during China's Ming dynasty to a 1972 coronal mass ejection that detonated thousands of US mines. It also examines Venus's runaway greenhouse effect and early warnings about climate change, and how Martian dust storms influenced the course of the Cold War.
The book's central insight grew out of Degroot's own experience as an amateur astronomer. After buying a solar telescope, he found watching the Sun distinctly unsettling. «It was one thing to know, but another thing entirely to experience, that the foundation of all human existence was on some level unstable, and unpredictable,» he writes. He eventually sold the telescope but wrote the book as an exploration of how individuals and societies have responded to that cosmic instability over the ages.
Degroot's interdisciplinary perspective spans climate change, space exploration and existential risk. That breadth is both a strength and a challenge for readers. The narrative moves quickly across centuries and continents, at times resembling a fast-walking museum guide who offers fascinating details about every object in passing. Figures resemble those from an academic review, with captions stretching to half a page, and the references alone occupy more than 40 pages. The density of facts can make the book feel like an academic argument under construction rather than a straightforward narrative.
Yet the work rewards revisiting. One reviewer found that after an initial reading, the book kept drawing them back — to check a reference, note a quotation for teaching, or revisit a section not fully absorbed the first time. Many nonfiction books are enjoyable in the moment but end up gathering dust on a shelf; this one migrated to a reference bookcase, its inhabitants pulled out again and again.
Degroot can also write beautifully. Venus, he notes, is «not only hotter than an oven, but hot enough to melt an oven.» A potentially complex explanation of how oxygen isotope ratios in microscopic fossils serve as proxies for past climate change is dispatched in a single, crystal-clear paragraph that stands as a lesson in science communication.
The book is not for every casual popular-science reader expecting a tour of the planets. Degroot stresses in his introduction that this is a history book, and viewed on those terms it works well as a comprehensive record of how humanity has responded to observations and changes in a handful of celestial bodies. It is ultimately a book to flick back and forth through, making liberal use of its index and references — for instance, to relocate a fascinating mention of NASA's response to potentially harmful lunar bacteria.
Published by Viking, the 416-page book is priced at £22 in hardback. Some books make a big splash and never return to the surface. This one, as its title suggests, produces ripples that may be felt for some time.
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