Mike Brotherton, author of the novel Spider Star released last month from Tor, proudly calls himself a hard science fiction writer. And now he's sharing the secret of his hardness with you. Brotherton just posted a really interesting, provocative list of general-audience books about space and astrobiology that he consults before writing anything. He lists everything from the well-regarded astrobiology book Life Everywhere, to the lesser-known classic Sex in Space. If you're interested in the real science behind aliens and space travel, you'll want to check out Brotherton's bookshelf. [Mike Brotherton via Biology in Science Fiction]