I stumbled on this intriguing book over the holidays, in a pile of remaindered science books in one of our local bookstores. It turned out to be one of the better impulse book buys I’ve made lately.
The title itself is suggestive of the contents, but doesn’t nearly capture the richness of the author's presentation. The general topic is asteroids colliding with earth, and the threat they pose to life on earth and modern civilization, but Dillow approaches the subject with a measure of humor, a longtime journalist’s talent for research and storytelling, and a truly cosmic problem to consider.
The book begins with the author describing a large meteorite exploding in the atmosphere over his home in Arizona a few years ago, a spectacular natural event which he and many others witnessed, and which started him down the road toward writing this book.
From that beginning, he moves to the story of the 50,000-year-old meteorite crater near Flagstaff, Arizona, which is a now a local tourist site. He explains how it was created, how it was “discovered” by white settlers in the nineteenth century, and how (as with other meteorite crash sites around the world) it was initially believed to be the residue of some sort of volcanic event. He then recounts the history of the clear-sighted individuals who eventually realized what it was, but then had to convince a skeptical worldwide scientific community over many decades that it really was the result of a massive meteorite impact.
Dillow then continues to weave together other aspects of the related scientific discoveries and events which inform our current understanding of the asteroid and comet threats to our planet. He explains how science had long had a consensus view that natural processes in the earth sciences were controlled by the uniformitarian doctrine, the idea that all changes were gradual, and caused by the same processes we now know about, a concept that was recently disrupted by the rise of the catastrophism doctrine.
Catastrophism is the contrary view (to uniformitarianism) that contends that some major changes in earth’s history were the result of cataclysmic but rare events, such as asteroid strikes. Inevitably, this leads the author to a discussion of the changing scientific beliefs about what caused the end of the dinosaur era, a debate which has played out over the past half century or so in popular culture as well as the scientific community.
Some of the most fascinating parts of the book detail several major asteroid strikes in historical memory, and how scientists came to understand and prove what they really were, in contrast to earlier religious and pseudo-scientific explanations (spoiler alert: they weren't caused by UFOs).
The 1908 Tunguska explosion in Russia, which I can recall was still considered a scientific mystery when I was young, is one of the best examples, as well as the 2013 Chelyabinsk asteroid event (also coincidentally in Russia). Dillow includes fascinating descriptions of both, and the means by which scientists eventually were able to confirm and explain what happened, including being able to calculate the approximate size and speed of the asteroids, and explaining why they created the particular explosive effects they did.
From there, the story moves on to the networks of governmental organizations and resourceful amateur citizen astronomers who have gradually built a database of Near Earth Objects (NEOs), and have begun to plan for the planetary defense. Needless to say, there are some wonderfully interesting and eccentric personalities involved. Dillow also looks at the growing public recognition and acceptance of the risks posed by asteroid strikes, the strategies proposed for defending against asteroids on a collision course with our planet, the politics of it all, and also includes evaluations of the Hollywood science fiction movies that have been made about it.
This book was written just a little too early to include a discussion of Don’t Look Up, the satirical 2021 disaster film about an impending asteroid strike starring Leonardo DiCaprio and Jennifer Lawrence (previously reviewed here). It’s too bad, because at the time, most people (including me) thought the movie was really not about an asteroid strike, but about climate change, and our collective failure to do anything effective to stop it from destroying our planet and civilization. It was very much in keeping with a long history of popular culture and science belittling and laughing about the idea of giant asteroids striking earth, whether in the ancient past or in the future.
But in retrospect, Dillow’s presentation makes it clear that while a catastrophic asteroid strike may be a far less likely event in any of our lifetimes, it is one that is no less potentially devastating to us, our global human society and life on earth than the climate crisis. For that reason, he suggests, we should take it seriously too, and keep working on ways to try to protect our world from this low probability but very high-impact threat.
Fire in the Sky is an excellent piece of science reporting. It includes an enjoyable and educational mix of human stories of individual dedication and collective folly, along with plenty of science history. It also provides clear explanations of what we currently know and believe about asteroids, comets, and their frequent collisions with other celestial bodies, especially Earth and the moon. Highly recommended.
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