sparkymonster is looking for not-textbook-but-more-technical-and-
sciency-than-the-usual-popular-science- book book recommendations for her brother here, who requested:
"a book about one of these: planetary geology, life on other planets, astronomy, earth geology. I'd like a book that focuses on the science itself, not the sociology of science, not the cultural history of history. Something like Stephen Hawkins' A Brief History of Time, but not that specifically since I've already read it and probably not another book him."