We may not be able to judge a book by its cover, but hopefully we can judge a moon by its surface. Jupiter’s moon Europa is a primary target of astrobiology in our solar system because some scientists think it may harbor a habitable ocean beneath it’s icy crust. Richard Greenberg, professor in the Lunar and Planetary Laboratory at the University of Arizona and former member of the imaging team of NASA’s Galileo spacecraft, has now released a book about the scratched and splotchy surface of Europa.