There’s a lot of science in this book – and not just the obvious topics. What other popular book on astrobiology embraces subjects like information entropy, or the anthropic principle, or gamma-ray bursts, or Zipf’s law? Miller’s explanations of the first two are as engaging and lucid as I’ve seen anywhere, and as for the last two – well, I never would have guessed they were relevant to SETI until he pointed it out.
A longstanding hobbyhorse of mine is that the aliens of popular imagination – as evidenced in sci-fi movies and UFO reports – look much too similar to homo sapiens to have any scientific credibility. Real aliens are going to be much more alien than that. It’s a point Miller makes in the very first pages of the book – and before long he’s gone even further. Professional scientists make analogous if less obvious mistakes. Most SETI initiatives are based on the unstated assumption that aliens are going to think and communicate in much the same way that Earth scientists do in the early 21st century. Astrobiologists tend to think of “life” as synonymous with multicellular DNA-based organisms, with so-called extremophiles being as weird as it gets (Miller, incidentally, thinks the extremophiles came first, so actually we’re the extreme ones). Even here on Earth, however, there may be non-DNA life in the form of desert varnish – the jury has been out on that one since Darwin’s time.
Despite the expectations set by that titular exclamation mark, anyone looking for dumbed-down science isn’t going to find it in this book. Quite the opposite, in fact. Although Miller has a lively, easy-to-read style, he clearly thinks like a scientist – and occasionally he does scientist-like things that a more seasoned pop-science writer would never do. He uses equations, for example – not just once or twice, but quite a lot. He assumes readers know what logarithms are, and how to convert between logs to different bases. Sometimes he forgets who he’s talking to, and uses words in a way that only physics graduates use them (Example: “The chance of a third helium nucleus colliding with beryllium-8 in time to make carbon-12 is therefore vanishingly slim. Hoyle’s genius was to suggest that there might be a fortuitous resonance, in the form of an excited state of carbon, which exactly matched the energy of the beryllium-8 nucleus when capturing a helium nucleus.”)
To put it in a nutshell, The Aliens Are Coming! is highbrow content in lowbrow packaging. For me, the biggest downside of this arrangement is that the author doesn’t cite his sources. The book has an unusually large number of footnotes, but they’re almost all textual asides rather than references. Miller clearly put a lot of effort into primary-source research, and I would have welcomed a few pointers to help me dig deeper into some of the topics for myself. A second “lowbrow” feature of the book is the lack of an index – but that hardly matters, because this isn’t a book for dipping into. It’s one you’re going to read from cover to cover.
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