A magnitude 15 earthquake would involve the release of almost 1032 joules of energy, which is roughly the gravitational binding energy of the Earth. To put it another way, the Death Star caused a magnitude 15 earthquake on Alderaan.
This is a fun book to recommend, because unlike most books, there’s a demo available online. Go read that, and if you like it, the book contains more. It also has a very literal subtitle: “serious scientific answers to absurd hypothetical questions.”
Munroe has had a fascinating career to date, and I remain an avid fan of his webcomic. It was definitely a formative influence on the nerdier side of my sense of humor,1 and continues to make me laugh an average of slightly more than three times a week.2
This is a fairly good book for reading in small chunks – each ‘chapter’ is only a few pages long, and there’s no need to read them in any specific order.
All in all, it’s a fun read, and I definitely recommend it.