Book Review: Death From the Skies!

Death From the Skies!

The full title here is Death from the Skies!: These Are the Ways the World Will End, and in it astrophysicist (or something along those lines) Phillip Plait takes on the bombastic topic of global annihilation. Specifically, he looks at all the ways Earth could destroyed by threats from outer space, dedicating a chapter to each threat. Topics include being hit by an asteroid (or meteor or meteorite or whatever it would be called at that point), blasted by a too-close supernova, having our electrical systems fried by a particularly obnoxious solar flare, being immolated when our dying sun gives out a final cosmic belch, being yanked down into a meandering black hole, and perhaps most strangely the eventual heat death of the entire universe.

After presenting each apocalyptic scenario in the form of a small vignette, Plait takes you through the hard science associated with such things, usually accompanied by generous use of scientific notation in an attempt at giving you a proper sense of scale. So you learn about the magnetic fields of the sun and Earth and how those could be screwed up in the event of a huge solar flare, for example, or what Einstein’s theories have to say about the event horizon of a black hole. The author even poses some crazy solutions to problems that straddle the line between science fiction and fact, like the idea of millennium-long endeavors to move Earth to a more distant orbit to save it from an expanding sun. It’s all really interesting for a nerd like me, and Plait does a pretty good job of keeping it high level and sensational enough so that you don’t have to solve any equations. It’s not necessarily light reading, but anybody with a decent high school science education and some imagination can follow along well enough to get the point.

You might think that this all serves to play on some grotesque fascination with planet-wide (or solar system-wide or galaxy-wide, or even universe-wide) death and destruction. There’s some of that, particularly in the chapters on asteroid collisions and monster solar flares, both of which HAVE happened and WILL happen again . But those two events aside, Plait quickly moves on to events that are next to impossible (e.g., being zapped by a nearby gamma ray burst) or guaranteed to happen only after a few billion more years (e.g., our sun running out of fuel). It’s on topics like these that Plait just shrugs his shoulders and says “Yeah, but what the hell it’s fun to conjecture, so let’s just go for it.”

And he’s right –it IS fun to move the decimal point a few places in our probability estimates or fast forward the clock by trillions of years. Mental problems aside, you’re not going to lie awake at night wondering if you’re going to fall into the supermassive black hole in the middle of the Milky Way, but Plait is a good enough popular science writer to make it fascinating to hear about what would happen if you did.

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