UFOs, satellite arrays, the Klingon language, crop circles, and Area 51 can all be found in the Aliens! series (6 titles). Each themed volume contains 12 topical double-page spreads full of trivia, photos, and numbers-driven stat boxes. Aliens in the Movies provides a fun pop-culture survey of sci-fi films (Dune, Alien, Avatar), TV shows (Star Trek, Doctor Who), and literature, paying particular attention to the contributions of women and people of color. Though all the books include information on alien theories or sightings that have been debunked, none of the volumes defines UFO or separates it from aliens. That's not necessarily a criticism, but this browsable series is definitely tailored to alien enthusiasts rather than skeptics.